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**Figure 85-3** Rate of oxygen uptake by the lungs during maximal exercise for 4 minutes and then for about 40 minutes after the exercise is over. This figure demonstrates the principle of *oxygen debt*.
Reconstitution of the lactic acid system means mainly the removal of the excess... | {
"Header 1": "**Sports Physiology**",
"token_count": 1935,
"source_pdf": "datasets/websources/biochem/1671268744mpp.pdf"
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The changes that occur inside the hypertrophied muscle fibers include (1) increased numbers of myofibrils, proportionate to the degree of hypertrophy; (2) up to 120% increase in mitochondrial enzymes; (3) as much as 60% to 80% increase in the components of the phosphagen metabolic system, including ATP and phosphocre... | {
"Header 1": "**Sports Physiology**",
"token_count": 2000,
"source_pdf": "datasets/websources/biochem/1671268744mpp.pdf"
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This finding results mainly from the fact that blood flow through many of the pulmonary capillaries is sluggish or even dormant in the resting state, whereas in maximal exercise, increased blood flow through the lungs causes all the pulmonary capillaries to be perfused at their maximal rates, thus providing a far great... | {
"Header 1": "**Sports Physiology**",
"token_count": 1891,
"source_pdf": "datasets/websources/biochem/1671268744mpp.pdf"
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**Table 85-2** Comparison of Cardiac Function Between Marathoner and Nonathlete
| Type of Athlete | Stroke Volume<br>(ml) | Heart Rate<br>(beats/min) |
|-----------------|-----------------------|---------------------------|
| Resting | | |
| Nonathlete | ... | {
"Header 1": "**Sports Physiology**",
"token_count": 2019,
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As a consequence of these findings, some of the supplemental fluids for athletics contain properly proportioned amounts of potassium along with sodium, usually in the form of fruit juices.
#### **Drugs and Athletes**
Without belaboring this issue, let us list some of the effects of drugs in athletics.
First, some... | {
"Header 1": "**Sports Physiology**",
"token_count": 1691,
"source_pdf": "datasets/websources/biochem/1671268744mpp.pdf"
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#### **Normal Values for Selected Common Laboratory Measurements**
| Substance | Average<br>("Normal" Value) | Range | Comment/Unit of Measure ... | {
"Header 1": "**Sports Physiology**",
"token_count": 1851,
"source_pdf": "datasets/websources/biochem/1671268744mpp.pdf"
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Third Edition
Principles of Polymer Chemistry
Third Edition
A. Ravve Niles, IL, USA
ISBN 978-1-4614-2211-2 ISBN 978-1-4614-2212-9 (eBook) DOI 10.1007/978-1-4614-2212-9 Springer New York Heidelberg Dordrecht London
Library of Congress Control Number: ... | {
"Header 1": "Principles of Polymer Chemistry",
"token_count": 530,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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This book, unlike the first and second editions, is primarily aimed to be a textbook for a graduate course in polymer chemistry and a reference book for practicing polymer chemists. The first and second editions, on the other hand, were aimed at both graduate and undergraduate students. Comments by some reviewers, that... | {
"Header 1": "Preface",
"token_count": 525,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
| 1 | | Introduction and Nomenclature<br> | 1 |
|---|-----|------------------------------------------------------------------|----|
| | 1.1 | Brief Historical Introduction | 1 |
| | 1.2 | Definitions ... | {
"Header 1": "Contents",
"token_count": 7232,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
7.17.4) | 499 | |
| 7.15 | Polysilanes | | 499 | |
| 7.16 | | Phosphonitrile Polymers | 500 | |
| | | ... | {
"Header 1": "Contents",
"token_count": 719,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
| | 546 |
| | 8.4 | Polyisoprene | | 547 |
| | 8.5 | Proteins | | 547 |
| | | 8.5.1 | a-Amino Acids<br> ... | {
"Header 1": "Contents",
"token_count": 3297,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The initial proof of the existence of very large organic molecules was supplied by Raoult [\[1](#page-30-0)] and van't Hoff [\[2](#page-30-0)], who carried out cryoscopic molecular weight determinations on rubber, starch, and cellulose nitrate. By the methods developed by Raoult and by van't Hoff and by the formulation... | {
"Header 1": "1.1 Brief Historical Introduction",
"token_count": 2022,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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An example can be a block copolymer of styrene and isoprene:
n m
polystyrene block-polyisoprene block
Still another type of a copolymer is one that possesses backbones composed of one individual polymer and the branches from another one. It is called a *graft copolymer,* because many such materials were formed by... | {
"Header 1": "1.1 Brief Historical Introduction",
"token_count": 2047,
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This can be the case with telomers. Here, the end groups are named as radicals,
Table 1.1 Illustration of common chain-growth polymers
| Name | Monomer | Polymer |
|---------------------------|---------|-------------|
| Polyethylene | | n |
| Polyisobutylene ... | {
"Header 1": "1.1 Brief Historical Introduction",
"token_count": 1605,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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In linear polymers, due to the polymerization process, the pendant groups can be arranged into orderly configurations or they can lack such orderliness. Propylene, for instance, can be polymerized into two types of orderly steric arrangement. It can also be polymerized into one lacking steric order. The same can be tru... | {
"Header 1": "1.4 Steric Arrangement in Macromolecules",
"token_count": 2038,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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France, 6(2), 294 (1866).
- 5. G. Bouchardat, Compi. Rend., 89, 1117 (1879).
- 6. G. Wagner, Ber., 11, 1260 (1878).
- 7. R. Fittig and F. Engelhorn, Ann., 200, 65 (1880).
- 8. R. Willst€atter and L. Zechmeister. Ber. 46, 2401 (1913).
- 9. L. H. Baekeland, md. Eng. Chem., 5,506(1913).
- 10. H. Staudinger, Ber., 53, 1073... | {
"Header 1": "1.4 Steric Arrangement in Macromolecules",
"token_count": 1071,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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#### 2.1 Structure and Property Relationship in Organic Polymers
For a very large proportion of polymeric materials in commercial use, mechanical properties are of paramount importance, because they are used as structural materials, fibers, or coatings and these properties determine their usefulness. Properties that ... | {
"Header 1": "Chapter 2 Physical Properties and Physical Chemistry of Polymers",
"token_count": 335,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Dipole interactions result from molecules carrying equal and opposite electrical charges. The amounts of these interactions depend upon the abilities of the dipoles to align with one another. Molecular orientations are subject to thermal agitation that tends to interfere with electrical fields. As a result, dipole forc... | {
"Header 1": "*2.1.1 Effects of Dipole Interactions*",
"token_count": 2047,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Copolymers melt at lower temperatures than do homopolymers of the individual monomers. By increasing the amount of a comonomer the melting point decreases down to a minimum (this could perhaps be compared to a eutectic) and then rises again.
The tightest internal arrangement of macromolecules is achieved by crystal... | {
"Header 1": "*2.1.1 Effects of Dipole Interactions*",
"token_count": 273,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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A number of macromolecules show little tendency to crystallize or align the chains in some form of an order and remain disordered in solid form. This, of course, is also the condition of all molten polymers. Some of them, however, due to structural arrangement, remain completely amorphous upon cooling. The crystalline ... | {
"Header 1": "2.2 The Amorphous State",
"token_count": 2036,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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[10](http://dx.doi.org/10.1007/978-1-4614-2212-9_10)). Urban and coworkers [[19\]](#page-80-0) studied stimuli-responsive (*T*SR) transitions and correlated them to the glass transition temperatures (*T*<sup>g</sup> ). Based on their empirical data obtained from a copolymer, they concluded that the relationship between... | {
"Header 1": "2.2 The Amorphous State",
"token_count": 337,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The phenomenon of elasticity of rubber and other elastomers is a result of a tendency of large and very flexible amorphous polymeric chains to form random, thermodynamically favorable, conformations [\[18](#page-80-0)]. If a certain amount of crosslinking is also present, then these random conformations occur between t... | {
"Header 1": "*2.2.2 Elasticity*",
"token_count": 2006,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The contribution of the internal energy *E* to the force of retraction is
$$f = (\partial E/\partial L)_{T,p} - T(\partial S/\partial L)_{T}$$
Bueche [[16\]](#page-80-0) expressed differently the work done on stretching an elastic polymeric body. It describes deforming an elastomer of *x* length, stretched to an in... | {
"Header 1": "*2.2.2 Elasticity*",
"token_count": 826,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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When an amorphous polymer possesses a certain amount of rotational freedom, it can be deformed by application of force. Application of force will cause the polymer to flow and the molecules will move past each other. The science of deformation and flow is called *rheology*. In the event that the force is applied quickl... | {
"Header 1": "*2.2.3 Rheology and Viscoelasticity of Polymeric Materials*",
"token_count": 2047,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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[2.2.3](#page-41-0)). Although linear molten polymers exhibit well-defined viscosities, they also exhibit elastic effects. These effects are present even in the absence of any crosslinks or a rubber network. It is referred to as *creep*. This creep is attributed to entanglement of polymeric chain to form temporary phys... | {
"Header 1": "*2.2.3 Rheology and Viscoelasticity of Polymeric Materials*",
"token_count": 2031,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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For Newtonian liquids the viscosity can be determined from the following equation:
$$\eta = \pi D^4 \Delta P / 128 LQ$$
where L represents the length of the capillary. The shear stress at the capillary wall can be calculated from the pressure drop:
$$\sigma_{\text{wall}} = D\Delta P/4L$$
Also, the shear rate at... | {
"Header 1": "*2.2.3 Rheology and Viscoelasticity of Polymeric Materials*",
"token_count": 1082,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Certain basic information was established about the *crystallization from the melt* [\[5](#page-80-0)]: The process is a first-order phase transition and follows the general mathematical formulation for the kinetics of a
Fig. 2.9 Illustration of the helical conformation of isotactic vinyl polymers
![](_page_49_Pict... | {
"Header 1": "*2.3.1 Crystallization from the Melt*",
"token_count": 962,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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For many polymers, crystal growth can also take place from dilute solutions and from such solutions they yield single crystals. Crystal formations in polymers were studied intensively almost from the time of recognition of their existence in macromolecules. Single crystals of organic polymers were recognized as early a... | {
"Header 1": "*2.3.2 Crystallization from Solution*",
"token_count": 1151,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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For polymers that crystallize from the melt, an important parameter in the characterization of the two-phase systems, is the weight fraction of the crystalline regions. The degree of crystallinity that can be reached is dependent on the temperature at which crystallization takes place. At low temperatures one attains a... | {
"Header 1": "*2.3.3 Spherulitic Growth*",
"token_count": 1985,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Because only portions of the polymeric chains participate in the formations of crystallites, the section or sections of the chains of *x* length that participate in crystallite formation can be designated as z<sup>e</sup> <sup>0</sup> and the sections of the chains that remain in disorder and amorphous, as *x* z<sup>e<... | {
"Header 1": "*2.3.3 Spherulitic Growth*",
"token_count": 2048,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The state of mesomorphism is a spontaneously ordered liquid–fluid crystalline state. Liquid crystals were discovered as early as 1888. They are materials that exhibit order in one or two dimensions but not in all three. By comparison, the amorphous materials lack any order, while the crystalline ones exhibit order in t... | {
"Header 1": "2.4 The Mesomorphic State, Liquid Crystal Polymers",
"token_count": 1949,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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One such material can be illustrated as follows:
$$C_6H_{13}O$$
$O$
$O$
$O$
$O$
$O$
$O$
$O$
$O$
$O$
It was also shown that it is possible to synthesize polymethacrylate liquid crystal polymers with mesomorphic properties that contain ferrocenes with two flexible chains at the l,l<sup>0</sup> -positions [[59\]](#pag... | {
"Header 1": "2.4 The Mesomorphic State, Liquid Crystal Polymers",
"token_count": 2029,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Solutions of polymers deviate to a great extent from Raoult's law, except at extreme dilution. In extremely dilute solutions the ideal behavior is approached as an asymptotic limit. These deviations arise largely from small entropies of mixing. That is mostly due to the large difference in size between the solute and t... | {
"Header 1": "*2.6.2 The Thermodynamics of Polymer Solutions*",
"token_count": 2046,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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This can be seen by imagining that equal weights of two different sizes of molecules are combined, $M_1 = 10,000$ and $M_2 = 100,000$ . The combination would consist of ten molecules of $M_1$ and one molecule of $M_2$ . The weight average molecular weight of this mixture is $(10^8/2 \times 10^5 + 10^{10}/2 \time... | {
"Header 1": "*2.6.2 The Thermodynamics of Polymer Solutions*",
"token_count": 1186,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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To determine the intrinsic viscosity, both inherent and reduced viscosities are plotted against concentration (C) on the same graph paper and extrapolated to zero. If the intercepts coincide then this is taken
**Fig. 2.17** Cannon–Fenske capillary viscometer
as the intrinsic viscosity... | {
"Header 1": "2.7.2 Methods for Measuring Molecular Weights of Polymers",
"token_count": 2050,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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It was postulated in the past that the separation that takes place by molecular sizes is due to smaller molecules diffusing into all the pores while the larger ones only into some of the pores. The largest molecules were thought to diffuse into none of the pores and pass only through the interstitial volumes. As a resu... | {
"Header 1": "2.7.2 Methods for Measuring Molecular Weights of Polymers",
"token_count": 2043,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Optical activity in biopolymers has been known and studied well before this phenomenon was observed in synthetic polymers. Homopolymerization of vinyl monomers does not result in structures with asymmetric centers (The role of the end groups is generally negligible). Polymers can be formed and will exhibit optical acti... | {
"Header 1": "2.8 Optical Activity in Polymers",
"token_count": 1170,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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1. What are the secondary bond forces that influence the physical properties of macromolecules?
#### Section 2.1.1
1. Explain and illustrate dipole–dipole interactions in polymers and how do they affect the properties of polymeric materials. Can you give other examples?
#### Section 2.1.2
- 1. What are the indu... | {
"Header 1": "*Section 2.1*",
"token_count": 2038,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Why is it necessary to extrapolate to zero (explain how this is done) in order to obtain intrinsic viscosity.
- 16. Discuss the various methods of molecular weight determination explain why a particular method yields a number of a weight average molecular weight, or, as in case of GPC, both.
#### *Section 2.8*
1. D... | {
"Header 1": "*Section 2.1*",
"token_count": 2010,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Morehead, and N.M. Walter, *J. Polymer Sci*., 1960, *44*, 349
- 35. A. Keller, "Growth and Perfection of Crystals," Wiley, New York, 1958: A. Keller and A. O'Connor, *Polymer*, 1960, *1*, 163
- 36. W.M.D, Bryant, *J. Polymer Sci*., 1947, *2*, 547
- 37. R.St.J. Mauley, *Nature*, 1961, *189*, 390; S. Hosoda, Y. Nozue, Y.... | {
"Header 1": "*Section 2.1*",
"token_count": 1983,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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*Soc*., 1956,*78*, 2646; *ibid*., 1958, *80*, 1933
- 74. G. Natta, M. Farina, M. Peraldo, and G. Bressan, *Makromol*. *Chem*., 1961, *43*, 68
- 75. M. Farina and G. Bressan, *Makromol*. *Chem*., 1963, *61*, 79
- 76. P. Pino, F. Ciardelli, and G. P. Lorenzi, *J. Am*. *Chem*. *Soc*., 1963, *85*, 3883
- 77. P. Pino, F. Ci... | {
"Header 1": "*Section 2.1*",
"token_count": 327,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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#### 3.1 Free-Radical Chain-Growth Polymerization Process
Polymerizations by free-radical mechanism are typical free-radical reactions. That is to say, there is an *initiation*, when the radicals are formed, a *propagation*, when the products are developed, and a *termination*, when the free-radical chain reactions e... | {
"Header 1": "Free-Radical Chain-Growth Polymerization",
"token_count": 730,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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By combination
2 R $\longrightarrow$ R $\longrightarrow$ R $\longrightarrow$ R $\longrightarrow$ R $\longrightarrow$ R $\longrightarrow$ R $\longrightarrow$ R $\longrightarrow$ R $\longrightarrow$ R $\longrightarrow$ R $\longrightarrow$ R $\longrightarrow$ R $\longrightarrow$ R $\longrighta... | {
"Header 1": "Free-Radical Chain-Growth Polymerization",
"token_count": 2039,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The above is based on an assumption that $k_{\rm P}$ and $k_{\rm I}$ are independent of the sizes of the radicals. This is supported by experimental evidence that shows that radical reactivity is not affected by the size, when the chain length exceeds dimer or trimer dimensions [3]. The reactions involved in a typi... | {
"Header 1": "Free-Radical Chain-Growth Polymerization",
"token_count": 2000,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Triphenylazobenzene,
$$\begin{array}{c|ccccccccccccccccccccccccccccccccccc$$
The triphenylmethyl radical shown above is resonance stabilized and unable to initiate polymerizations. The phenyl radical, on the other hand is a hot radical. It initiates polymerizations readily. Decomposition rates of some azonitrile in... | {
"Header 1": "Free-Radical Chain-Growth Polymerization",
"token_count": 2028,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Also, Engel and coworkers [[16\]](#page-156-0) reported synthesis of an initiator that can function both as a thermal free radical initiator and a photoinitiator (see Sect. [3.2.4](#page-92-0)). It can be illustrated as follows:
N N O O O
The claimed advantage of this initiator is that it can be used to form block ... | {
"Header 1": "Free-Radical Chain-Growth Polymerization",
"token_count": 2015,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Initiating radicals, however, do not appear to be produced from mere decompositions of these peroxides [\[35](#page-157-0)].
#### *3.2.4 Photochemical Initiators*
This subject is discussed in greater detail in Chap. [10,](http://dx.doi.org/10.1007/978-1-4614-2212-9_10) in the section on photo-cross-linking reaction... | {
"Header 1": "Free-Radical Chain-Growth Polymerization",
"token_count": 643,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Different radioactive sources can initiate free-radical polymerizations of vinyl monomers. They can be emitters of gamma rays, beta rays, or alpha particles. Most useful are strong gamma emitters, such as <sup>60</sup>Co or <sup>90</sup>Sr. Electron beams from electrostatic accelerators are also efficient initiators. T... | {
"Header 1": "3.2.5 Initiation of Polymerization with Radioactive Sources and Electron Beams",
"token_count": 1905,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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| Monomer | Structure | 0<br>00 (mol/L)<br>K<br>/K |
|---------------------|-----------|----------------------------|
| Acrylonitrile | N | 0.12 |
| Methyl methacrylate | OCH3 | 0.30 |
| Vinyl acetate | O<br>O | 0.91 ... | {
"Header 1": "3.2.5 Initiation of Polymerization with Radioactive Sources and Electron Beams",
"token_count": 1141,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The steric effects depend upon the sizes of the substituents. The resonance stabilization of the substituents has been shown to be in the following order [[70\]](#page-157-0):
$$C1 > 0$$
$> 0$ $> 0$ $> 0$ $> 0$ $> 0$ $> 0$ $> 0$
3.4 Propagation 85
| Table 3.7 | Affinity of methyl radical for olefinsa ... | {
"Header 1": "*3.4.1 Steric, Polar, and Resonance Effects in the Propagation Reaction*",
"token_count": 1569,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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There were some early reports that reaction media influences the polymerizations of vinyl chloride in aliphatic aldehydes at 50C [[80,](#page-158-0) [81](#page-158-0)]. This was not confirmed in subsequent studies [[82–84\]](#page-158-0). Subsequently, the rate of polymerization was shown to be influenced by the pH of ... | {
"Header 1": "*3.4.2 Effect of Reaction Medium*",
"token_count": 2026,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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This is known as the *gel effect* or as the *Trammsdorff effect*, or also, as the *Norrish*–*Smith effect* [[66\]](#page-157-0). The effect has been explained as being caused by a decrease in the rate of termination due to increased viscosity of the medium. Termination is a reaction that requires two large polymer-radi... | {
"Header 1": "*3.4.2 Effect of Reaction Medium*",
"token_count": 2035,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The first reaction can be either one of combination or of disproportionation. In a combination reaction, two unpaired spin electrons, each on the terminal end of a different polymer-radical, unite to form a covalent bond and a large polymer molecule. In disproportionation, on the other hand, two polymer-radicals reac... | {
"Header 1": "*3.4.2 Effect of Reaction Medium*",
"token_count": 1772,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The number average degree of polymerization has to be written as follows:
$$\overline{\mathrm{DP}} = \frac{R_{\mathrm{p}}}{(R_{\mathrm{t}}/2) + k_{\mathrm{tr,M}}[\mathrm{M}^{\bullet}][\mathrm{M}] + k_{\mathrm{tr,s}}[\mathrm{M}^{\bullet}][\mathrm{S}] + k_{\mathrm{tr,I}}[\mathrm{M}^{\bullet}][\mathrm{I}]}$$
It can al... | {
"Header 1": "*3.4.2 Effect of Reaction Medium*",
"token_count": 1290,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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If more than one monomer species is present in the reaction medium, a copolymer or an interpolymer can result from the polymerization reaction. Whether the reaction products will consist of copolymers or just a mixture of homopolymers of both, however, depends largely upon the reactivity of the monomers. A useful and a... | {
"Header 1": "3.6 Copolymerization",
"token_count": 1565,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Relative quantities of each product are then determined
$$RMgX + NaBH_4 \longrightarrow R \bullet \longrightarrow \begin{pmatrix} & & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & ... | {
"Header 1": "3.6 Copolymerization",
"token_count": 1324,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Though molecular orbital calculations allow accurate predictions of reactivity ratios [[133\]](#page-159-0), many chemists also rely upon the Price–Alfrey *Q*–*e* equations [\[140](#page-159-0)]. These are based on: (1) the polarity of the double bonds of the monomers or measures of the propagating chain ends, (2) meso... | {
"Header 1": "*3.6.2 Q and e Scheme*",
"token_count": 1555,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
It was reported by Barb in 1953 that solvents can affect the rates of copolymerization and the composition of the copolymer in copolymerizations of styrene with maleic anhydride [[145\]](#page-159-0). Later, Klumperman also observed similar solvent effects [[145\]](#page-159-0). This was reviewed by Coote and coworkers... | {
"Header 1": "*3.6.3 Solvent Effect on Copolymerization*",
"token_count": 485,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
A quantitative treatment of terpolymerization, where three different monomers are interpolymerized, becomes complex. Nine growth reactions take place [[155\]](#page-159-0):
| Reaction | Rate |
|--------------------------------|----------------------------|
| K11 M1M1<br>M1<... | {
"Header 1": "3.7 Terpolymerization",
"token_count": 1606,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The resonance stabilization can be illustrated on an allyl alcohol radical:
OH OH
The hydrogen transfer takes place from the allylic hydrogen, as shown on allyl acetate:
$$R \bullet + \bigcirc$$
$R \bullet + \bigcirc$
$R \bullet + \bigcirc$
$R \bullet + \bigcirc$
$R \bullet + \bigcirc$
$R \bullet + \bigcirc$
$R \... | {
"Header 1": "3.7 Terpolymerization",
"token_count": 2035,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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[\[152](#page-159-0)], reported that they successfully performed the radical polymerization of allylbiguanide hydrochloride in a concentrated, acid solution using either hydrochloric acid or phosphoric acid in the presence of a radical initiator at 50C. The polymer was precipitated from the reaction solution through th... | {
"Header 1": "3.7 Terpolymerization",
"token_count": 1301,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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A few monomers, such as styrene and methyl methacrylate, will, after careful purification and presumably free from all impurities, polymerize at elevated temperatures. It is supposed that some ring-substituted styrenes act similarly. The rates of such thermal self-initiated polymerizations are slower than those carried... | {
"Header 1": "3.10 Thermal Polymerization",
"token_count": 2024,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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An example is a triphenylphosphine interaction with acrylic monomers [\[193](#page-160-0)]:
$$\begin{array}{c} & & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ ... | {
"Header 1": "3.10 Thermal Polymerization",
"token_count": 2047,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
It may be due to greater reactivity of the portion of the monomer that complexes toward the growing chain end. It may also be due to formation of new complexes between uncomplexed monomer and complexed ones [171]:
$$\begin{array}{c} N \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\$$
The picture is more compl... | {
"Header 1": "3.10 Thermal Polymerization",
"token_count": 2021,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
In typical homogeneous free radical polymerizations, however, bimolecular terminations between two growing radicals cannot be avoided and, therefore, typical living free radical polymerization cannot be fully realized. Also, in conventional free radical polymerizations, the initiations are slow, while high-molecular-we... | {
"Header 1": "3.10 Thermal Polymerization",
"token_count": 962,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Reversible degenerative transfers based on thermodynamically neutral exchange reactions between growing radicals and transfer agents:
$$P_n \bullet + P_1 \longrightarrow R \xrightarrow{k_{tr}} P_1 \bullet + P_n \longrightarrow R$$
For the propagating polymer chain
$$Co_{2}R$$
$Co_{2}R$ $Co_{2}R$ $Co_{2}R$ $Co... | {
"Header 1": "3.10 Thermal Polymerization",
"token_count": 1684,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Catalytic chain transfer polymerizations can utilize metals such as low spin cobalt(II) compounds as chain transferring agents. The mechanism is believed to involve repeated disturbing of each propagating step by abstraction of hydrogen atoms from the propagating polymers. This yields chains with unsaturated terminal u... | {
"Header 1": "*3.14.1 Cobalt Mediated Polymerizations*",
"token_count": 1918,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The mechanism can be illustrated as follows:
$$P_{n} = X + Cu \times X / Ligand = K_{activ} \times X / Ligand + P_{n} = K_{t} / P_{n} = P_{m}$$
$$K_{p} \times A_{t} = K_{t} / A_{t} \times A_{t} = A_{t} \times A_{t} \times A_{t} \times A_{t} \times A_{t} \times A_{t} \times A_{t} \times A_{t} \times A_{t} \times A_{... | {
"Header 1": "*3.14.1 Cobalt Mediated Polymerizations*",
"token_count": 2013,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
RBr + Cu(I)Br/Ligand Cu(II)Br<sup>2</sup> /Ligand + R polymer +e- -e-
A similar ATP process is one that uses iron(II) bis(triphenylphosphine)-dichloride[FeCl2(PPh3)2]. It induces "living" polymerization of monomers such as methyl methacrylate in conjunction with organic halides as initiators in the presence and in ... | {
"Header 1": "*3.14.1 Cobalt Mediated Polymerizations*",
"token_count": 1987,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The reaction of polymerization can be illustrated as follows:
$$\begin{array}{c|ccccccccccccccccccccccccccccccccccc$$
Klumperman and coworkers [\[259](#page-161-0)] observed that while it is lately quite common to treat living radical copolymerization as being completely analogous to its radical counterpart, small ... | {
"Header 1": "*3.14.1 Cobalt Mediated Polymerizations*",
"token_count": 460,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
A nitroxide mediated polymerization of styrene was first reported in 1985 [[262\]](#page-161-0). This reaction, however, was studied extensively only since 1993. The monomer conversion rates vs. temperatures are much slower than they are in conventional styrene polymerization. Also, the polydispersities of the products... | {
"Header 1": "*3.14.3 Nitroxide-Mediated Radical Polymerizations*",
"token_count": 1979,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The ratio of *M*w/*M*n, however, was not disclosed
Recently, Grubbs and coworkers [[272\]](#page-161-0) have synthesized an active alkoxyamine by reaction of 2 methyl-2-nitrosopropane with 1-bromoethylbenzene, catalyzed by ligated CuBr in the presence of metallic copper. A purified alkoxyamine was used to initiate th... | {
"Header 1": "*3.14.3 Nitroxide-Mediated Radical Polymerizations*",
"token_count": 2009,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Based on the basic RAFT mechanism, shown above, its value mainly governs the extent of rate retardation in RAFT polymerizations [[278\]](#page-162-0).
Calitz, Tonge, and Sanderson reported the results of a study of RAFT polymerization by means of electron spin resonance spectroscopy [[276\]](#page-162-0). They observ... | {
"Header 1": "*3.14.3 Nitroxide-Mediated Radical Polymerizations*",
"token_count": 1069,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
It was reported that it is possible to employ persistent phosphorus-based radicals in controlled/living free-radical polymerization [\[283](#page-162-0), [284](#page-162-0)]. Also, in cases of low stability of the hyper coordinated radicals, the ligand exchanges become facile and some organoaluminum, organoboron, and o... | {
"Header 1": "*3.14.5 Special Types of Controlled/\"Living\" Polymerizations*",
"token_count": 1787,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
There is a close relationship between monomer structure and changes in free energy, in enthalpy and in entropy. Thus, for instance, knowledge of changes in enthalpy will allow appropriate thermal control of the reaction and yield proper rate of propagation and molecular weight distribution. The quantities of D*F*, D*H*... | {
"Header 1": "*3.15.1 Effects of Monomer Structure on the Thermodynamics of the Polymerization*",
"token_count": 278,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Free-radical polymerization reactions are equilibrium reactions. The equilibrium between the monomer and the growing polymer is subject to thermodynamic conditions. At equilibrium, therefore, the change in free energy is zero:
$$\Delta F = 0$$
The change in free energy for the reaction can, therefore, be written; ... | {
"Header 1": "*3.15.2 Thermodynamics of the Constrains of the Free-Radical Polymerization Reaction*",
"token_count": 2032,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
This is because the monomer droplets are slowly converted from thin immiscible liquids to sticky viscous materials that subsequently become rigid granules. The tendency is for the sticky particles to attach to each other and to form one big mass. The suspending agent's sole function is to prevent coalescing of the stic... | {
"Header 1": "*3.15.2 Thermodynamics of the Constrains of the Free-Radical Polymerization Reaction*",
"token_count": 2041,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The final latex usually ends up containing about 10<sup>15</sup> polymer particles per milliliter of water. By the time conversions reach 10–20% there are no more micelles present in the reaction mixtures. All the emulsifier is now adsorbed on the surface of the polymer particles. This means that no new polymer particl... | {
"Header 1": "*3.15.2 Thermodynamics of the Constrains of the Free-Radical Polymerization Reaction*",
"token_count": 2046,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
It be carried out in a regular emulsion polymerization [\[325](#page-163-0)] and in a reverse emulsion polymerization [\[326](#page-163-0)].
Also, recently, several reports in the literature have described miniemulsion RAFT polymerizations. In some instances, use is made of water-soluble RAFT agents to control polyme... | {
"Header 1": "*3.15.2 Thermodynamics of the Constrains of the Free-Radical Polymerization Reaction*",
"token_count": 2034,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
- 1. Show the proposed charge-transfer mechanism for copolymerization of styrene with maleic anhydride and dioxene with maleic anhydride.
- 2. What determines the stability of charge-transfer complexes? Explain and give examples.
#### *Section 3.12*
1. How do some polar monomers complex with Lewis acids? How does t... | {
"Header 1": "*Section 3.11*",
"token_count": 2021,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Furukawa and T. Tsuruta, and S.Inoue, *J. Polymer Sci*.,1957, *26*, 234
- 29. N. Ashikari and N. Nishimura, *J. Polymer Sci*., 1958, *28*, 250
- 30. R.C. Petry and F.H. Verhoek, *J. Am*. *Chem*. *Soc*., 1956, *78*, 6416
- 31. J. Furukawa and T. Tsuruta, *J. Polymer Sci*., 1958, *28*, 227
- 32. C.E.H. Bawn, D. Margeriso... | {
"Header 1": "*Section 3.11*",
"token_count": 1994,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
*Chem*., *Rapid Commun*., 1981, *2*, 729
- 69. H. Kilambi, J.W. Stansbury, and C.N.Bowman, *Macromolecules*, 2007, *40*, 47
- 70. C. Walling and E. H. Huyser, Vol. 13, *Organic Reactions*, A.C. Cope, (ed.), Wiley, New York, 1963
- 71. C.H. Bamford, W.G. Barb, A.D. Jenkins, and P.F. Onyon, *Kinetics of Vinyl Polymerizat... | {
"Header 1": "*Section 3.11*",
"token_count": 1980,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
*Soc., Polymer Preprints*, 1967, *8* (1), 35
- 109. G.B. Butler and M.A. Raynolds, *J. Org*. *Chem*., 1965, *30*, 2410: G.B. Butler, T.W. Brooks, *J. Org*. *Chem*., 1963, *28*, 2699
- 110. S. Erkoc and A. Ersin Acar, *Macromoleculles*, 2008, ASAP article,[10.1021/ma801492a](http://dx.doi.org/10.1021/ma801492a), web rel... | {
"Header 1": "*Section 3.11*",
"token_count": 1998,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Hutchinsone, *Macromolecules*, 2010, *43*, 6311
- 148. A.D. Jenkins, *J. Polymer. Sci., Chem. Ed.,* 1996, *34*, 3495
- 149. G.E. Ham, General Aspects of Free-Radical Polymerization, in Vinyl Polymerization, G.E.Ham, ed., Dekker, New York, 1971
- 150. T. Alfrey, Jr., and G. Goldfinger, *J. Polymer Sci*., 1944, *12*, 322... | {
"Header 1": "*Section 3.11*",
"token_count": 1993,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
*Chem*. *Soc.,* 1956, 7*0*, 1669
- 185. Y.Li and S.R. Turner, *Am. Chem. Soc. Polymer Preprints*, 2009, *50*(2),4830
- 186. L.K. Montgomery, K. Schueller, P.D. Bartlett, *J. Am*. *Chem*. *Soc*., 1964, *86*, 622
- 187. M. Imoto, T.Otsu, and M. Nakabayashi, *Makromol. Chemie*, 1963, *65*, 194
- 188. M.M. Martin and N. P.... | {
"Header 1": "*Section 3.11*",
"token_count": 2009,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Wang, T. Grimaud, and K. Matyjaszeski, *Macromolecules*, 1997, *30*, 6507
- 226. T. Ando, M. Kato, M.Kamigaito, and M. Sawamoto, *Macromolecules*, 1996, *29*,1070; M. Ouchi, S. Tokuoka, and M. Sawamoto, *Macromolecules*, 2008, Web. Article [10.1021/ma70245d](http://dx.doi.org/10.1021/ma70245d); M. Sawamoto, *Am. Chem. ... | {
"Header 1": "*Section 3.11*",
"token_count": 1983,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Klumperman, Bert; Chambard, Gregory; Brinkhuis, *ACS Symposium Series*, *2003*, 854
- 260. Velazquez, O.; Vivtaldo, E.; Ortega, I. A.; Zhu,S. *AIChE Journal* 2002*,48,* 2597-2608
- 261. J. Chiefari, Y.K. Chong, F. Ercole, J. Krstina, J. Jeffery, T.P.T. Lee, R.T.A. Mayadunne, G.F. Meijs, C.L. Moad, G. Moad, E. Rizzardo,... | {
"Header 1": "*Section 3.11*",
"token_count": 2009,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Riddle, *Monomeric Acrylic Esters*, Reinhold, New York, 1961
- 295. J. Coupek, M. Kolinsky, and D. Lim, *J. Polymer Sci*., C4, 126 (1964)
- 296. R.F. Hoffmann, S. Schreiber, and G. Rosen, *Ind*. *Eng*. *Chem*, 56, 51 (1964)
- 297. A.Ravve, J.T. Khamis, and L.X. Mallavarapu, *J. Polymer Sci*., A-1,3, 1775 (1965)
- 298. ... | {
"Header 1": "*Section 3.11*",
"token_count": 2004,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
#### 4.1 The Chemistry of Ionic Chain-Growth Polymerization
Ionic polymerization can be either cationic or anionic. This difference stems from the nature of the carrier ions on the growing polymeric chains. If in the process of growth, the chains carry positive centers, or carbon cations, the mechanism of chain growt... | {
"Header 1": "Chapter 4 Ionic Chain-Growth Polymerization",
"token_count": 1873,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
When a steady state exists, the rates of initiation and termination are equal to each other:
$$[HM^+.\dots.(AR)^-] = \mathit{Kk}_i[A][RH][M]^2/\mathit{k}_t$$
The rate of propagation can be written as:
$$R_{\rm P} = Kk_{\rm i}k_{\rm t}[{\rm A}][{\rm RH}][{\rm M}]^2/k_{\rm t}$$
The number average degree of polyme... | {
"Header 1": "Chapter 4 Ionic Chain-Growth Polymerization",
"token_count": 1839,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
As mentioned, in cationic polymerizations the reactive portions of the chain ends carry positive charges during the process of chain growth. These active centers can be either unpaired cations or they can be cations that are paired and associated closely with anions (counterions).
The initiations result from transpos... | {
"Header 1": "4.3 Cationic Polymerization",
"token_count": 695,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The step of cationic initiation can be subdivided into two separate reactions [[9\]](#page-257-0). The first one consists of formation of ionic species and the second one of reactions of these ionic species with the olefins, a cationization process. This reaction, termed "priming" by Kennedy and Marechal [9] is a proce... | {
"Header 1": "*4.3.1 Two Electron Transposition Initiation Reactions*",
"token_count": 2012,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
This led to a suggestion that the process may involve an allylic self-initiation [[26\]](#page-257-0):
$$+$$
$MnX_n$ $\longrightarrow$ $MnX_nH$
The above suggested mechanism can only apply to polymerizations of monomers with allylic hydrogens. Also, it is contradicted by the ability of 1,1-diphenylethylene to d... | {
"Header 1": "*4.3.1 Two Electron Transposition Initiation Reactions*",
"token_count": 2016,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Some examples of stable cations that can initiate cationic polymerizations are [40]:
$$C \oplus$$
Triphenylmethyl ion
Xanthylium ion
The above shown cations form crystalline salts with anions. These anions are $ClO_4^-$ , $SbCl_6^-$ , $BF_4^-$ , $PF_6^-$ , $SbF_6^-$ , $FeCl_4^-$ , and $AsF_6^-$ [40].
Th... | {
"Header 1": "*4.3.1 Two Electron Transposition Initiation Reactions*",
"token_count": 2029,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Also, radicals that are formed by addition of other radicals to alkyl vinyl ethers are particularly reactive.
Oxidants that can be used in these reactions are salts, like $(C_6H_5)_2I^+PF_6^-$ . Such salts oxidize the radical and also supply the counter-ions, as shown below [54]:
$$\begin{array}{c|cccccccccccccccc... | {
"Header 1": "*4.3.1 Two Electron Transposition Initiation Reactions*",
"token_count": 1949,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
A mechanism was suggested based on anodic oxidation of the monomer:
$$\begin{array}{c} \text{ClO}_4{}^\ominus \stackrel{-e}{\longrightarrow} \text{ClO}_4{}^\bullet + e \\ \\ \text{ClO}_4{}^\bullet + M \stackrel{}{\longrightarrow} \text{ClO}_4{}^\ominus + M^\ominus \end{array}$$
where, M is monomer. Later, however, ... | {
"Header 1": "*4.3.1 Two Electron Transposition Initiation Reactions*",
"token_count": 2011,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
A Bawn and Ledwith mechanism [[99\]](#page-258-0) for the polymerization of vinyl ethers is based on data that suggests that only one mesomeric form of the ethers exists, presumably *trans* [[98\]](#page-258-0)
$$\begin{array}{cccccccccccccccccccccccccccccccccccc$$
An alkyl substituent composed of a three-carbon ch... | {
"Header 1": "*4.3.1 Two Electron Transposition Initiation Reactions*",
"token_count": 1998,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
This can take place in the case of aluminum alkyl and boron fluoride:
$$R_3Al + BF_3 \rightarrow [R_2Al]^{\oplus} + [BF_3R]^{\odot}$$
Further coordination of aluminum alkyl to the anions is possible if the coordination number of the central atom is sufficiently large [\[46](#page-257-0)]:
$$\left[BF_{3}R\right]^{... | {
"Header 1": "*4.3.1 Two Electron Transposition Initiation Reactions*",
"token_count": 444,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
This means that the positive charges are distributed to the adjacent oxygens and are not localized on the carbons:
$$\delta \oplus | \mathbb{N}$$
Counterion
The monomer can potentially add in four different ways:
1.
$$\delta \oplus$$
$OS \oplus$
$OS \oplus$
$OS \oplus$
$OS \oplus$
$OS \oplus$
$OS \oplus$
$OS \opl... | {
"Header 1": "*4.3.1 Two Electron Transposition Initiation Reactions*",
"token_count": 2048,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The propagations were suggested [\[110](#page-258-0)] to take place in three successive stages when the reactions are carried out in methylene chloride at 20C. In the first one, rapid, short-lived ionic reactions take place. In the second stage, the ions can no longer be detected by spectroscopy or conductivity measure... | {
"Header 1": "*4.3.1 Two Electron Transposition Initiation Reactions*",
"token_count": 2028,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
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