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At 130C an essentially pure crystalline 1,3 poly(methylbutene-1) forms. The nature of the counterion also has an effect on the slope of the product composition curve. The polarity of the solvent, however, apparently does not, nor does the monomer concentration [\[122](#page-259-0)].
Simultaneous migrations of hydroge... | {
"Header 1": "*4.3.1 Two Electron Transposition Initiation Reactions*",
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The termination reaction can occur by a transfer to a monomer at proper reaction conditions:
$$\begin{array}{cccccccccccccccccccccccccccccccccccc$$
The termination reactions in cationic polymerizations can often lead to low molecular weight products. This can be a result from various effects. Also, the counterions ... | {
"Header 1": "*4.3.4 Termination Reactions in Cationic Polymerizations*",
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a From various sources in the literature
b Protonic acids used were CH3SO3H, R2P(O)OH, and R<sup>0</sup>CO2H, where R ¼ OC6H<sup>5</sup> , C6H<sup>5</sup> , *n*-C4H<sup>9</sup> ; R<sup>0</sup> ¼ CF<sup>3</sup> , CCl<sup>3</sup> , CHCl<sup>2</sup> , CH2Cl
4. Addition of more monomer to a completed polymerization r... | {
"Header 1": "*4.3.4 Termination Reactions in Cationic Polymerizations*",
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Thus, for instance, very weak bases, such as water, initiate vinylidene cyanide polymerizations:
$$n \longrightarrow N$$
$H_2O$
$N$
$N$
$N$
$N$
$N$
$N$
$N$
$N$
$N$
$N$
Potassium bicarbonate initiates polymerization of 2-nitropropene:
$$n = \bigvee^{NO_2} \frac{KHCO_3}{}$$
On the other hand, monomers like acryli... | {
"Header 1": "*4.3.4 Termination Reactions in Cationic Polymerizations*",
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This is due to the initiator coordinating with the oxygen atom [\[153–155](#page-259-0)]:
$$C_4H_9$$
—Li + O $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ $C_4H_9$ ... | {
"Header 1": "*4.3.4 Termination Reactions in Cationic Polymerizations*",
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Here, the metal coordinates with the electron cloud of the whole conjugated structure. The overlap stretches and eventually ruptures the metal-alkyl bond. A new carbon to carbon covalent bond forms together with a new metal to carbon linkage:
$$\begin{array}{cccccccccccccccccccccccccccccccccccc$$
where M represents... | {
"Header 1": "*4.3.4 Termination Reactions in Cationic Polymerizations*",
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Three different simultaneous reactions appear to be taking place in butyllithium-initiated polymerizations of vinyl ketones in benzene [[168\]](#page-260-0):
$$(C_{4}H_{9}Li) \longrightarrow 6C_{4}H_{9}Li$$
$$C_{4}H_{9}Li + 2$$
$$1,4$$
$$C_{4}H_{9}Li + 1$$
$$1,2$$
$$C_{4}H_{9}$$
$$C_{4}H_{9}$$
$$C_{4}... | {
"Header 1": "*4.3.4 Termination Reactions in Cationic Polymerizations*",
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This depends upon the metal and upon the solvent. For instance, potassium is soluble in ethers, like dimethoxyethane or tetrahydrofuran, and the initiation conditions are homogeneous. On the other hand, sodium dispersions are insoluble in hydrocarbons and the initiations are heterogeneous. Liquid ammonia is a solvent f... | {
"Header 1": "*4.3.4 Termination Reactions in Cationic Polymerizations*",
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This is followed by a coupling reaction:
the coupling process:
$$\bigoplus_{2 \ \text{Na}^{----} \text{CH}_2} \bigoplus_{\text{CH}_2 \bullet} \bigoplus_{\text{Na}^{----} \text{CH}_2} \bigoplus_{\text{CH}_2 - -- \cdot \text{Na}} \bigoplus_{\text{CH}_2 - -- \cdot \text{Na}} \bigoplus_{\text{CH}_2 - -- \cdot \text{Na}... | {
"Header 1": "*4.3.4 Termination Reactions in Cationic Polymerizations*",
"token_count": 2096,
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At first, the highly polarized monomers adsorb strongly to the metal surfaces. Electron transfer takes place. The adsorbed molecules are assumed to be still sufficiently mobile to be able to rotate after adsorption. The rotation allows the radical-anions that form to couple. The concentration of the anionic charges tha... | {
"Header 1": "*4.3.4 Termination Reactions in Cationic Polymerizations*",
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Electron transfer initiations can also result from reactions of alkali metals with aromatic hydrocarbons or with aromatic ketones that result in formations of radical-ions:
$$Na + \bigcirc$$
$Na + \bigcirc$
$Na + \bigcirc$
$Na + \bigcirc$
$Na + \bigcirc$
$Na + \bigcirc$
$Na + \bigcirc$
$Na + \bigcirc$
$Na + \bigcir... | {
"Header 1": "*4.3.4 Termination Reactions in Cationic Polymerizations*",
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These ketyls exist in equilibrium mixtures of monomeric anion-radicals and dimeric dianions [\[136](#page-259-0)]. Originally there was some controversy about the mechanism of initiation of monomers like acrylonitrile or methyl methacrylate by sodium benzophenone. The following mechanism was derived from spectral evide... | {
"Header 1": "*4.3.4 Termination Reactions in Cationic Polymerizations*",
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This tends to destabilize the carbanion and also to cause steric interference with solvation of the chain end and with the addition of the monomer [[197\]](#page-260-0).
#### 4.4.2.1 Steric Control in Anionic Polymerization
Use of hydrocarbon solvents has an advantage in polymerizations of conjugated dienes because... | {
"Header 1": "*4.3.4 Termination Reactions in Cationic Polymerizations*",
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This depends upon the counterion, the solvent, and the temperature [[203\]](#page-260-0):
O O S Me S O O Me S S S
where S means a solvent molecule; Me represents a metal.
Several mechanisms were offered to explain steric control in polymerizations of polar monomers. Furukawa and coworkers [[157\]](#page-259-0) ba... | {
"Header 1": "*4.3.4 Termination Reactions in Cationic Polymerizations*",
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"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Depending upon reaction conditions, such as solvent, monomer concentration, and temperature some polymerizations can take place through the carbon to carbon double bonds [\[216](#page-260-0)].
*Cis* and *trans* crotonamides can also polymerize by hydrogen transfer polymerization. Sodium *t*-butoxide in pyridine yield... | {
"Header 1": "*4.3.4 Termination Reactions in Cationic Polymerizations*",
"token_count": 384,
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Termination reactions in anionic polymerization, particularly with non-polar monomers and in nonpolar solvent are not common. If carbanion quenching impurities are absent, many polymerization reactions may not terminate after a complete disappearance of the monomer. Styryl anion, (one of the most stable ones) for insta... | {
"Header 1": "*4.4.3 Termination in Anionic Polymerization*",
"token_count": 1992,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The catalysts for these polymerizations can be separated into two groups. To the first one belong the so-called Ziegler–Natta catalysts. To the second one, transition metal oxides on special supports, like carbon black or silica-alumina, etc. Besides the two, there are related catalysts, like transition metal alkyls or... | {
"Header 1": "4.5 Coordination Polymerization of Olefins",
"token_count": 1799,
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The polymeric growth takes place from the aluminum–carbon bond of the bimetallic electron-deficient complexes [[232,](#page-261-0) [234](#page-261-0)]:
$$\begin{array}{c} \bigoplus_{CH_2 \longrightarrow CH_2} \bigoplus_{CH_2 \longrightarrow CH_2} \bigoplus_{R - - AI} \bigoplus_{R - - AI} \bigoplus_{R - - AI} \bigoplu... | {
"Header 1": "4.5 Coordination Polymerization of Olefins",
"token_count": 2046,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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This mechanism assumes that the reaction occurs at a transition metal ion on the surface layer of the metal trichloride (or perhaps dichloride) lattice. Here the halide is replaced by an alkyl group (R). The adjacent chloride site is vacant and accommodates the incoming monomer molecule. Using titanium chloride as an i... | {
"Header 1": "4.5 Coordination Polymerization of Olefins",
"token_count": 2047,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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This means that two enantiomorphic forms exist (see Fig. 4.4). The monomers coordinate at either one of the two faces (at the vacant sites). Coordination results in formation of one of two diastereoisomeric intermediate transition states. Both result in isotactic placements, but the products are either *meso* or *racem... | {
"Header 1": "4.5 Coordination Polymerization of Olefins",
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This differs significantly from the mechanism of isotactic placement by catalytic site control with the heterogeneous catalysts. The active sites of homogeneous catalyst do not discriminate between the faces of the incoming monomers in the step of coordination. Instead, steric hindrance between the substituents of the ... | {
"Header 1": "4.5 Coordination Polymerization of Olefins",
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"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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#### *4.5.4 Post Ziegler and Natta Coordination Polymerization of Olefins*
In the current industrial practice, coordinated anionic catalysts differ considerably from the original ones, developments by Ziegler, Natta and others. Using the same basic chemistry, new compounds were developed over the years that yield l... | {
"Header 1": "4.5 Coordination Polymerization of Olefins",
"token_count": 2037,
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The mechanism of monomer insertion and steric control in polymerizations of a-olefins by the metallocene catalysts received considerable attention [\[293–297](#page-262-0)]. There is no consensus on the mechanism of polymerization. Many studies of chain propagation tend to support the Cossee-Arleman mechanism [[293–2... | {
"Header 1": "4.5 Coordination Polymerization of Olefins",
"token_count": 2039,
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The front-side insertion is accompanied by chain migration from one side to the other whereas backside attack does not involve inversion at the metal center.
Lohrenz et al. [\[296](#page-262-0)] concluded that insertion into the metal-polymer bond takes place exclusively from the backside. That means that no inversio... | {
"Header 1": "4.5 Coordination Polymerization of Olefins",
"token_count": 1539,
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The polymerizations were illustrated as follows:
THF Cl Cl THF Cl
$$C_1$$
$C_2$ $C_3$ $C_4$ $C_4$ $C_5$ $C_4$ $C_5$ $C_4$ $C_5$ $C_4$ $C_5$ $C_4$ $C_5$ $C_4$ $C_5$ $C_4$ $C_5$ $C_4$ $C_5$ $C_4$ $C_5$ $C_4$ $C_5$ $C_4$ $C_5$ $C_5$ $C_4$ $C_5$ $C_4$ $C_5$ $C_5... | {
"Header 1": "4.5 Coordination Polymerization of Olefins",
"token_count": 2085,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Homura and coworkers [\[305](#page-262-0)] investigated a series of half-titanocenes containing pyrazole ligands that have been employed as catalyst precursors for ethylene polymerization, syndiospecific styrene polymerization, and copolymerization of ethylene with 1-hexene, styrene, and norbornene in the presence of... | {
"Header 1": "4.5 Coordination Polymerization of Olefins",
"token_count": 1992,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Aldehyde polymers were probably known well over 100 years ago [\[322–324](#page-263-0)]. In spite of that, polyoxymethylene is the only product from aldehyde polymerization that is produced in large commercial quantities. Formaldehyde polymerizes by both cationic and anionic mechanisms. An oxonium ion acts as the propa... | {
"Header 1": "4.6 Polymerization of Aldehydes",
"token_count": 1216,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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When the initiators are protonic acids the reactions can be illustrated as follows (additional monomers are not shown):
$$\bigoplus_{H \in A} + 0 \longrightarrow R \longrightarrow H \bigoplus_{O \longrightarrow -R} R \longrightarrow H \bigoplus_{O \longrightarrow -R} R \longrightarrow H \bigoplus_{O \longrightarrow -... | {
"Header 1": "4.6 Polymerization of Aldehydes",
"token_count": 2046,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Polymerization reactions require good solvent if weak cationic initiators are used. When strong initiators are employed, the reactions are difficult to control. Low temperatures can be maintained by such techniques as boiling off low boiling solvents.
Formation of pure isotactic polyacetaldehyde was reported. It form... | {
"Header 1": "4.6 Polymerization of Aldehydes",
"token_count": 1892,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The placement can be through carbon to carbon double bond, or through the carbonyl group, or it can be 1,4:
1 2 3 4 ladder structure 1,2 and 3.4
$$1,2$$
$1,3$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$ $1,4$... | {
"Header 1": "4.6 Polymerization of Aldehydes",
"token_count": 2089,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The structures of the materials include linkages from both vinyl and carbonyl groups. In addition, tetrahydropyran rings, as shown above, can also form [357].
Coordination complexes, like $CdI_2(pyridine)_2$ , also initiate polymerizations of acrolein. Propagation reactions precede through both, vinyl and carbonyl g... | {
"Header 1": "4.6 Polymerization of Aldehydes",
"token_count": 1172,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Ionic copolymerizations are more complicated than free-radical ones. Various complicating factors arise from effects of the counterions and from influences of the solvents. These affect the reactivity ratios. In addition, monomer reactivity is affected by the substituents. They influence the electron densities of the d... | {
"Header 1": "4.8 Copolymerizations by Ionic Mechanism",
"token_count": 2029,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Similarly, vanadium based catalysts yield alternating copolymers of ethylene and butadiene, where the butadiene placement is predominantly *trans*-1,4 [[197\]](#page-260-0).
Giuronett and Mecking carried out copolymerizations of ethylene with 1-olefins in supercritical carbon dioxide by electron poor nickel complexes... | {
"Header 1": "4.8 Copolymerizations by Ionic Mechanism",
"token_count": 2010,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Here, 1-methoxy-1(trimethylsiloxy)-2-methyl-1-propene was used as an initiator and HgI<sup>2</sup> as a catalyst. This differs from the nucleophilic-catalyzed group transfer polymerizations described above. The half-lives were reported to be in the range of minutes to hours. Induction periods were observed. Formation o... | {
"Header 1": "4.8 Copolymerizations by Ionic Mechanism",
"token_count": 1057,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The reaction is illustrated as follows:
$$\begin{array}{c} & & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & &... | {
"Header 1": "4.8 Copolymerizations by Ionic Mechanism",
"token_count": 1077,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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Analyses of polymers to determine stereosequence distributions and understand the propagation mechanism can be carried out with NMR spectroscopy aided by statistical propagation models [\[222](#page-261-0), [402](#page-264-0), [403\]](#page-264-0). A detailed discussion of the subject is beyond this book. The following... | {
"Header 1": "4.10 Configurational Statistics and the Propagation Mechanism in Chain-Growth Polymerization",
"token_count": 1313,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The dyads functions are:
$$(m) = P_{r/m}/(P_{m/r} + P_{r/m})$$
$(r) = P_{m/r}/(P_{m/r} + P_{r/m})$
The triad fractions are:
$$(mm) = (1 - P_{m/r})P_{r/m}/(P_{m/r} + P_{r/m})$$
$$(mr) = 2P_{m/r}P_{r/m}/(P_{m/r} + P_{r/m})$$
$$(rr) = (1 - P_{r/m})P_{m/r}/(P_{m/r} = P_{r/m})$$
There are six tetrad functions,... | {
"Header 1": "4.10 Configurational Statistics and the Propagation Mechanism in Chain-Growth Polymerization",
"token_count": 2047,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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The fitting of data can be carried out with the aid of computers.
By determining which statistical model is followed in a polymerization, such as Bernoullian, or Markov, or others, it should be possible to understand better the mechanism of steric control. Thus the Bernoulli model describes those reactions in which t... | {
"Header 1": "4.10 Configurational Statistics and the Propagation Mechanism in Chain-Growth Polymerization",
"token_count": 1914,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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- 1. Explain what is meant by the expression that initiation in cationic polymerization results from transposition of either one or two electrons. What type of initiating species is involved?
- 2. Summarize the initiation process in cationic chain-growth polymerization.
- 3. Show by chemical equations the initiation pr... | {
"Header 1": "*Section 4.3*",
"token_count": 1109,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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1. Discuss polymerization of ketones and isocyanates.
#### *Section 4.8*
1. Discuss copolymerization by ionic mechanism. What am some of the problems that are encountered?
#### *Section 4.9*
1. Discuss the proposed mechanisms of group transfer polymerization.
#### *Section 4.10*
1. What are Bernoulli, Marko... | {
"Header 1": "*Section 4.7*",
"token_count": 1986,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
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} |
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- 349. A Novak and E. Whaley, *Can. J. Chem*., 1959, *37*, 1710, 1718
- 350. R.C. Schulz, H. Fauth, and W. Kern, *Makromol. Chem*., 1956, 2*1*, 227
- 351. R.C. Schulz, H. Cherdron, and W. Kern, *Makro... | {
"Header 1": "*Section 4.7*",
"token_count": 1987,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Bailey, Jr, and R.D. Lunterg, .*J. Polymer Sci., Polymer Letters*, 1978, 16, 507
- 390. T. Saeguaa, *J.Macromol. Sci.,* 1972, *A,6*,, 997
- 391. AH.E. Muller, *Makromol. Chem., Macromol. Symp*., 1990, *32*, 87; W. Schubert and F.Bandermann, *Makromol. Chem*.,1989, *190*, 2721; W. Schubert, H.D. Sitz and F. Bandermann, ... | {
"Header 1": "*Section 4.7*",
"token_count": 1044,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Formation of polymers through ring-opening reactions of cyclic compounds is an important process in polymer chemistry. In such polymerizations, chain-growth takes place through successive additions of the opened structures to the polymer chain:
$$n \stackrel{\frown}{R} X \longrightarrow \frac{}{R} R \stackrel{\frown}... | {
"Header 1": "5.1 Chemistry of Ring-Opening Polymerizations",
"token_count": 337,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
There is general similarity between the kinetics of many ring-opening polymerization and those of step-growth polymerizations that are discussed in Chap. [7.](http://dx.doi.org/10.1007/978-1-4614-2212-9_7) Some kinetic expressions in ring-opening polymerizations, on the other hand, resemble ionic chain-growth reactions... | {
"Header 1": "5.2 Kinetics of Ring-Opening Polymerization",
"token_count": 1202,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Following reaction scheme was proposed [[2–6\]](#page-334-0):
*Initiation*
$$SnCl_4 + \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc \bigcirc$$
#### Propagation
$$\begin{array}{c} & & & & & \\ & & & & \\ & ... | {
"Header 1": "5.2 Kinetics of Ring-Opening Polymerization",
"token_count": 1474,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
This can be illustrated as follows:
$$(S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) + (S) ... | {
"Header 1": "5.2 Kinetics of Ring-Opening Polymerization",
"token_count": 1734,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The reaction is illustrated as follows:
$$\begin{array}{c|c} O & & & \\ \hline \\ N & & \\ \hline \\ N & & \\ \hline \\ N & & \\ \hline \\ N & & \\ \hline \\ N & & \\ \hline \\ N & & \\ \hline \\ N & & \\ \hline \\ N & & \\ \hline \\ N & & \\ \hline \\ N & & \\ \hline \\ N & & \\ \hline \\ N & & \\ \hline \\ N & & \\... | {
"Header 1": "5.2 Kinetics of Ring-Opening Polymerization",
"token_count": 1972,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Another reason is the tendency to chain transfer to monomers, particularly in polymerizations of substituted ring structures, like, for instance, in propylene oxide:
$$\begin{array}{c}$$
The newly formed species rearranges rapidly:
O very fast CH2O CH<sup>2</sup> Na Na
Such transfer reactions are E-2 type elimi... | {
"Header 1": "5.2 Kinetics of Ring-Opening Polymerization",
"token_count": 2042,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Cationic polymerizations of oxiranes are much less isospecific and regiospecific than are anionic polymerizations. In anionic and coordinated anionic polymerizations, only chiral epoxides, like propylene oxide, yield stereoregular polymers. Both pure enantiomers yield isotactic polymers when the reaction proceeds in a ... | {
"Header 1": "*5.3.4 Steric Control in Polymerizations of Oxiranes*",
"token_count": 2040,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
#### 5.4 Polymerization of Oxetanes
Oxetanes (or oxacyclobutanes) are preferably polymerized in solution to maintain temperature and stirring control. It is necessary to purify both the monomer and the solvent, because impurities interfere with attainment of high molecular weight.
F... | {
"Header 1": "*5.3.4 Steric Control in Polymerizations of Oxiranes*",
"token_count": 1366,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
He proposed a mechanism for the polymerization that is shown in the following scheme:
$$Ar_{2}I \bigoplus_{MtX_{n}} \bigoplus_{hv} \underbrace{Arl \bigoplus_{\Phi} MtX_{n}}_{Arl + Ar} \bigoplus_{MtX_{n}} \bigoplus_{H} HMtX_{n}$$
$$HMtX_{n} + 0 \bigoplus_{H} \bigoplus_{\Phi} MtX_{n} \bigoplus_{H} \bigoplus_{\Phi} Mt... | {
"Header 1": "*5.3.4 Steric Control in Polymerizations of Oxiranes*",
"token_count": 2044,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
New oxonium ions are generated in the process:
$$\begin{array}{c} \bigoplus \\ R_{3}O \ BF_{4} \end{array} + O \begin{array}{c} \bigoplus \\ R \longrightarrow O \\ \bigoplus \\ BF_{4} \end{array} + O \begin{array}{c} \bigoplus \\ R \longrightarrow O \\ \bigoplus \\ BF_{4} \end{array} + O \begin{array}{c} \bigoplus \\... | {
"Header 1": "*5.3.4 Steric Control in Polymerizations of Oxiranes*",
"token_count": 2002,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
This makes the acids the real initiators::
$$\begin{array}{c|ccccccccccccccccccccccccccccccccccc$$
Other initiators for tetrahydrofuran polymerizations also include Lewis acids in combinations with "promoters." These are complexes of Lewis acids, like BF3, SnCL1, or C2H5AlCl<sup>2</sup> with epirane compounds like ... | {
"Header 1": "*5.3.4 Steric Control in Polymerizations of Oxiranes*",
"token_count": 1581,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
[cat-X]
CH2Cl
The propagation process is a succession of nucleophilic attacks by fn electrons on the oxygens of the monomers upon the a-carbons of the heteroatoms of the ultimate polymerizing species [[1\]](#page-334-0):
<sup>O</sup> <sup>+</sup> <sup>O</sup> <sup>O</sup> O
The products of these reactions are l... | {
"Header 1": "*5.5.2 The Propagation Reaction*",
"token_count": 815,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The termination reactions in tetrahydrofuran polymerizations can depend upon the choice of the counterion, particularly if the reaction is conducted at room temperature [\[60](#page-335-0)]. In many reactions, the chains continue to grow without any considerable termination or transfer [[63,](#page-336-0) [64\]](#page-... | {
"Header 1": "*5.5.3 The Termination Reaction*",
"token_count": 795,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The cationic polymerizations of cyclic acetals are different from the polymerizations of the rest of the cyclic ethers. The differences arise from great nucleophilicity of the cyclic ethers as compared to that of the acetals. In addition, cyclic ether monomers, like epirane, tetrahydrofuran, and oxepane, are stronger b... | {
"Header 1": "5.7 Ring-Opening Polymerizations of Cyclic Acetals",
"token_count": 1423,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The following mechanism was proposed for the polymerizations that are initiated by reaction products of acetic anhydride with perchloric acid [\[78\]](#page-336-0):
O O O + HClO<sup>4</sup> O ClO<sup>4</sup> + O OH
*Initiation*
O + O O O O O
*Propagation*
O O O + O O O O O O O
**Termination**
$$\begin{arr... | {
"Header 1": "5.7 Ring-Opening Polymerizations of Cyclic Acetals",
"token_count": 2019,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Polymerization of six membered cyclic formals has, apparently not been explored [1]. Polymerization of 1,3-dioxopane can be initiated by camphor sulfonic acid [82, 83]:
1,3-trioxopane, a product of condensation of trioxane with ethylene oxide, can be polymerized by cationic mechanism both in solution and in bulk [[84... | {
"Header 1": "5.7.3 Polymerization of Dioxopane and Other Cyclic Acetals",
"token_count": 2010,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The acyl–oxygen bond cleaves and the chain binds through the oxygen to the catalyst by forming an alkoxide link rather than a carboxylate one:
$$AI - OR + (CH_2)_5$$
$O$ $O$ $AI$ $O$ $O$ $O$ $O$ $O$ $O$ $O$ $O$ $O$ $O$
There are potentially four active sites per trinuclear catalytic molecule... | {
"Header 1": "5.7.3 Polymerization of Dioxopane and Other Cyclic Acetals",
"token_count": 1424,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The initiating steps result from formations of adducts, amine-pivalate betaines:
$$\begin{array}{c|ccccccccccccccccccccccccccccccccccc$$
The above reaction appears to be restricted to highly strained lactones and may not work with larger lactones [95], For instance, when polymerization of $\delta$ -valerolactone i... | {
"Header 1": "5.7.3 Polymerization of Dioxopane and Other Cyclic Acetals",
"token_count": 2042,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Lactam molecules polymerize by three different mechanisms: cationic, anionic, and a hydrolytic one (by water or water releasing substances).
The lactam ring is strongly resonance stabilized and the carbonyl activity is low. Nevertheless, the ring-opening polymerizations start with small amounts of initiators through ... | {
"Header 1": "5.7.3 Polymerization of Dioxopane and Other Cyclic Acetals",
"token_count": 524,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The catalysts for cationic polymerization can be strong anhydrous acids, Lewis acids [[115\]](#page-337-0), salts of primary and secondary amines, carboxylic acids, and salts of amines with carboxylic acids that split off water at elevated temperatures [\[114](#page-337-0)]. The initiators react by coordinating with an... | {
"Header 1": "*5.9.1 Cationic Polymerization of Lactams*",
"token_count": 2026,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Acylations of the monomers with the amidinium cations result in formations of aminoacyllactams [[113\]](#page-337-0):
$$O = C - N - H \qquad O = C - N - H_2 \qquad O = C - N - C = O NH_3$$
Acylation of these amine groups by molecules of other protonated lactams results in the monomers becoming incorporated into the... | {
"Header 1": "*5.9.1 Cationic Polymerization of Lactams*",
"token_count": 2006,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
In such cases the anions of the initiating acids, like Cl<sup>-</sup>, react with the lactam cations to yield amino acid chlorides [114]:
$$\begin{array}{cccccccccccccccccccccccccccccccccccc$$
Only the more strained four-, eight- and nine-membered N-substituted lactams have so far been shown to be capable of polyme... | {
"Header 1": "*5.9.1 Cationic Polymerization of Lactams*",
"token_count": 2042,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
In the first instance, it is an alternate path of propagation with formation of imide groups:
ation of imide groups:
$$\begin{array}{cccccccccccccccccccccccccccccccccc$$
The acylation reactions shown above are much faster than the initiation reactions [129, 131] As a result, there are induction periods in anionic... | {
"Header 1": "*5.9.1 Cationic Polymerization of Lactams*",
"token_count": 948,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
This type of chain growth is termed *lactomolytic* propagation [137]:
$$\begin{array}{c} \begin{array}{c} \begin{array}{c} \begin{array}{c} \begin{array}{c} \\ \\ \\ \\ \end{array} \end{array} \\ \begin{array}{c} \\ \\ \end{array} \\ \begin{array}{c} \\ \\ \end{array} \\ \begin{array}{c} \\ \\ \end{array} \\ \begin{a... | {
"Header 1": "*5.9.1 Cationic Polymerization of Lactams*",
"token_count": 2038,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Thus, five-, six-, and seven-membered lactams polymerize at different temperatures and the products differ in molecular weights. For instance, $\alpha$ -pyrrolidone polymerizes readily at 30°C to a polymer of a molecular weight of 15,000, while $\epsilon$ -caprolactam requires 178°C to form polymers of that size or l... | {
"Header 1": "*5.9.1 Cationic Polymerization of Lactams*",
"token_count": 1550,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The polymerizations of these anhydrides (or substituted oxazolidine-2,5-diones) can be carried out with basic catalysts to yield polyamides:
$$\begin{array}{cccccccccccccccccccccccccccccccccccc$$
These polymerization reactions are important to biochemists because the products are poly( $\alpha$ -amino acid)s and re... | {
"Header 1": "**5.10** Polymerization of *N*-Carboxy-α-Amino Acid Anhydrides",
"token_count": 916,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
This process is repeated in every step of the propagation [[156\]](#page-338-0):
$$\begin{array}{cccccccccccccccccccccccccccccccccccc$$
#### *Propagation*
$$CH_{3}O \xrightarrow{H} Sn (C_{4}H_{9})_{3} + R \xrightarrow{H} O CH_{3}O \xrightarrow{H} R \xrightarrow{N} O CH_{3}O \xrightarrow{H} R \xrightarrow{N} O CH_... | {
"Header 1": "**5.10** Polymerization of *N*-Carboxy-α-Amino Acid Anhydrides",
"token_count": 1992,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Ring-opening polymerizations of alicyclics by Ziegler–Natta type catalysts resulted from general studies of olefin metathesis [[158–160\]](#page-338-0). These interesting reactions can be accomplished with the aid of many catalysts. The best results, however, are obtained with complex catalysts based on tungsten or mol... | {
"Header 1": "5.11 Metathesis Polymerization of Alicyclics",
"token_count": 1345,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
They can be illustrated as follows:
$$\begin{array}{c|c} Cl_{V_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathcal{I}_{\mathca... | {
"Header 1": "5.11 Metathesis Polymerization of Alicyclics",
"token_count": 1755,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
These catalysts show good functional compatibility in preparation of a variety of polyoctenamers with epoxide, acid, ether, ester, acetal and bromine functionalities.<sup>236</sup> The following illustration serves as an example [\[174\]](#page-338-0):
$$\begin{array}{c|c} & & & \\ \hline \\ & & \\ \hline \\ & & \\ \... | {
"Header 1": "5.11 Metathesis Polymerization of Alicyclics",
"token_count": 2043,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
\text{ ROP}}{2. \text{ hydrolysis}}$ HO OH
$\frac{1. \text{ ROP}}{2. \text{ hydrolysis}}$ HO OH
The product is a terpolymer with a soft midblock component with hard blocks at the end. As a result the polymer is a strong and tough material.
Ruthenium catalysts are reactive only towards olefins. As a result, it i... | {
"Header 1": "5.11 Metathesis Polymerization of Alicyclics",
"token_count": 1961,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Two mechanisms of formation of sulfonium ions are possible: (1) by approaches to the catalyst's electron accepting sites, (2) by abstraction of hydrides by methyl cations [190]:
$$\begin{array}{cccccccccccccccccccccccccccccccccccc$$
There are indications of a "living" chain-growth mechanism in boron trifluoride d... | {
"Header 1": "5.11 Metathesis Polymerization of Alicyclics",
"token_count": 515,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
A similar reaction was shown to take place with ethyllithium [\[195](#page-338-0)]:
$$S$$
+ $C_2H_5Li$ - $C_2H_5$ Li + $=$
Other side reactions that occur in butyllithium-initiated polymerizations are cleavages of the polysulfides [\[192](#page-338-0)]:
$$C_{4}H_{9} \bigoplus_{+} C_{4}H_{9} \bigoplus_{+} C_{... | {
"Header 1": "5.11 Metathesis Polymerization of Alicyclics",
"token_count": 2011,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
At a conversion of 20% the molecular weights are believed to be about 900,000 [\[196](#page-338-0)]. When diethylzinc is prereacted with optically active alcohols, optically active poly(propylene sulfide)s form [\[197–199](#page-338-0)]. Cadmium salts are also very effective catalysts for polymerization of thiiranes. T... | {
"Header 1": "5.11 Metathesis Polymerization of Alicyclics",
"token_count": 1307,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
This type of copolymerization results from spontaneous interactions of nucleophilic and electrophilic monomers (M<sup>N</sup> and ME, respectively) without any additions of catalysts. Zwitterions form in the process that subsequently leads to formation of polymers [\[214](#page-339-0)–[226\]](#page-339-0). The mechanis... | {
"Header 1": "5.15 Spontaneous Alternating Zwitterion Copolymerizations",
"token_count": 343,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
A reaction can also take place between a free monomer and any zwitterion at one of the ionic sites:
$$\bigoplus_{M_{N} \leftarrow M_{\overline{E}} = M_{N} \rightarrow n} \bigoplus_{M_{E}} \bigoplus_{M_{N} \leftarrow M_{\overline{E}} = M_{N} \rightarrow n} \bigoplus_{M_{E}} \bigoplus_{M_{N} \leftarrow M_{\overline{E}}... | {
"Header 1": "5.15 Spontaneous Alternating Zwitterion Copolymerizations",
"token_count": 1949,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
The onium ring from 2 oxazoline is opened by a nucleophilic attack of the carboxylate anion at carbon [\[214](#page-339-0)]:
$$\begin{array}{cccccccccccccccccccccccccccccccccccc$$
In this reaction the number of copolymer molecules increases at first, then reaches a maximum and finally decreases as the conversion be... | {
"Header 1": "5.15 Spontaneous Alternating Zwitterion Copolymerizations",
"token_count": 780,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
All three react in the same manner [[224\]](#page-339-0):
$$= \bigvee_{0}^{N} \bigvee_{0}^{N} \bigvee_{0}^{N} \bigvee_{0}^{N} \bigvee_{0}^{N} \bigvee_{0}^{N} \bigvee_{0}^{N} \bigvee_{0}^{N} \bigvee_{0}^{N} \bigvee_{0}^{N} \bigvee_{0}^{N} \bigvee_{0}^{N} \bigvee_{0}^{N} \bigvee_{0}^{N} \bigvee_{0}^{N} \bigvee_{0}^{N} ... | {
"Header 1": "5.15 Spontaneous Alternating Zwitterion Copolymerizations",
"token_count": 2109,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
This is the case with salicylyl phenyl phosphonite [\[224](#page-339-0)]. In the presence of bezoquinone it behaves as an M<sup>N</sup> monomer and produces a 1:1 alternating copolymer at room temperature [[224\]](#page-339-0):
$$\begin{array}{c|ccccccccccccccccccccccccccccccccccc$$
where, X ¼ Y ¼ H; X ¼ Y ¼ Cl; X ... | {
"Header 1": "5.15 Spontaneous Alternating Zwitterion Copolymerizations",
"token_count": 2037,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Write the chemical reactions for the mechanism of polymerization of propylene oxide with boron trifluoride–water.
- 4. Describe the mechanism and write the chemical reactions of ring-opening polymerizations of oxiranes with potassium hydroxide. In polymerization of propylene oxide with KOH what type of tacticity polyme... | {
"Header 1": "5.15 Spontaneous Alternating Zwitterion Copolymerizations",
"token_count": 939,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
- 1. What is metathesis polymerization? Explain the mechanism and show the reaction on a disubstitued olefin.
- 2. Describe metathesis polymerization of methyl cyclobutene showing the mechanisms of initiation and propagation.
- 3. Describe "living" metathesis polymerization. What types of catalysts are useful in such p... | {
"Header 1": "*Section 5.11*",
"token_count": 315,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
K.J. Ivin and J.C. Mol, *Olefin Metathesis and Metathesis Polymerization*, Academic Press, San Diego, 1997
- 1. M. Hitota and H. Fukuda, Makromol. Chem., 188, 2259 (1987); see also:F. Afsahar-Taroni, M. Scheer, P. Rempp, and E. Fanata, Makromol. Chem., 1978, *179*, 849
- 2. J. Furukawa and T. Saegusa, *Polymerization... | {
"Header 1": "*Recommended Reading*",
"token_count": 1992,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Price, *Accounts of Chemical Research*, 7, 294 (1974)
- 35. P. Dreyfuss and M.P. Dreyfuss, "Oxetane Polymers," pp. 653-670 in *Encyclopedia of Of Polymer Science and Engineering* , Vol 10, 2nd ed. (H.F. Mark, N.M. Bikales, C.G. Overberger, and G. Menges, eds.) Wiley-Interscience, New York, 1987
- 36. T. Tsuruta, *J. Po... | {
"Header 1": "*Recommended Reading*",
"token_count": 1995,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Polymer Sci*.,1967, *A-1,5*, 95
- 75. C.D. Kennedy, W.R. Sorenson, and G.G. McClaffin, *Am*. *Chem*. *Soc*. *Polymer Preprints*, 1966, *7*, 667
- 76. V. Jaack and W. Kern, *Makromol*. *Chem*.,1963, *62*, 1
- 77. K. Weissermel, E. Fischer, and K. Gutweiler, *Kunststoffe*,1964, *54*, 410
- 78. M. Ikeda, *J. Chem*. *Soc*.... | {
"Header 1": "*Recommended Reading*",
"token_count": 1980,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Yasuda, *Macromolecules,* 1996*, 29*, 1798
- 110. Y. Yao, Q. Shen, and J. Hu, *Gaofenzi Xuebao,* 1997 (6), 672 (from *Chem Abstr.*1998*, 128*, 154413k,16441Sh)
- 111. D.R. Wilson and R.G. Bearman, *J. Polymer Sci*., 1970, *A-1,18,* 2161
- 112. R.D. Lundberg, J.V. Koleske, and K.B. Wischmann, *J. Polymer Sci*.,1969, *A-... | {
"Header 1": "*Recommended Reading*",
"token_count": 2009,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
H. Yumoto and N. Ogata, *Makromol*. *Chem*.,1957, *25*, 71
- 147. M. Rothe, H. Boenisch, and D. Essig, *Makromol*. *Chem*., 1966, *91*, 24
- 148. J. N. Hay, *J. Polymer Chem*., *Polymer Letters*,1965, *5*, 577
- 149. O.B. Salamatina, D.K. Bonetskaya, S. M. Skuratov, and N.S. Enikolopyan, *Vysokomol*. *Soyed*.,1969, *A-... | {
"Header 1": "*Recommended Reading*",
"token_count": 1997,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Cohen, *Macromolecule*, 1997, *30*, 3137
- 180. D.M. Lynn, B. Mohr, and R.H. Grubbs, *J. Am. Chem. Soc.,*,1998, *120*, 1627
- 181. Y. Yong and T. Swager, *Macromolecules*, 2007, Web report10.1021/ma071304+S0024-9297(07)0134-6
- 182. L.M. Pitet and M.A. Hillmyer, Macromolecules, 2009, *42*, 3674
- 183. S.Hilf and F.M. K... | {
"Header 1": "*Recommended Reading*",
"token_count": 1989,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Kimura, *Macromolecules*, 1974, *7*, 1
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"Header 1": "*Recommended Reading*",
"token_count": 837,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
#### **6.1** Polyethylene and Related Polymers
Polyethylene is produced commercially in very large quantities in many parts of the world. The monomer can be synthesized from various sources. Today, however, most of ethylene comes from petroleum by high temperature cracking of ethane or gasoline fractions. Other poten... | {
"Header 1": "Chapter 6 Common Chain-Growth Polymers",
"token_count": 2030,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
Originally, the metallocene catalysts were typical metal complexes with two cyclopentadienyl or substituted cyclopentadienyl groups. Many variations were developed since. These materials are used in combination with methyl aluminoxane and have the potential of forming the polymers with high precision. Nevertheless, at ... | {
"Header 1": "Chapter 6 Common Chain-Growth Polymers",
"token_count": 2041,
"source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf"
} |
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