Quasiliving Carbocationic Polymerization. XII. Forced Ideal Copolymerization of lsobutylene with Styrene
作者:
Gábor Kaszás,
Miklós Györ,
JosephP. Kennedy,
Ferenc Tüdüs,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1982)
卷期:
Volume 18,
issue 9
页码: 1367-1382
ISSN:0022-233X
年代: 1982
DOI:10.1080/00222338208077229
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Forced ideal carbocationic copolymerization of isobutylene/styrene systems has been achieved by continuous addition of mixed monomer feeds to 2-chloro-2,4,4-trimethylpentane/TiCl4in n-hexane/methylene chloride charge by keeping the input rate equal to the overall rate of copolymerization. The composition of the copolymers was identical to that of the feeds over the entire monomer concentration range. The number-average molecular weight of the copolymers increased almost linearly with the amount of consumed monomers at higher isobutylene concentrations in the feed. The molecular weight increase was less pronounced at higher styrene concentration because more methylene chloride had to be used in the solvent system to keep the copolymer in solution. The micro-structure of the copolymers is uniform as determined by gel permeation chromatography (UV plus RI) and13C-NMR spectroscopy According to these studies, true copolymers have formed. The probability of triads in the copolymer has been determined.
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