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Ethylene–styrene diblock copolymers: Synthesis by Ziegler–Natta catalysis and identification
Author(s) -
Soum Alain,
Siove Alain,
Fontanille Michel
Publication year - 1983
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1983.070280305
Subject(s) - copolymer , natta , polyethylene , ethylene , styrene , ziegler–natta catalyst , catalysis , polymer chemistry , materials science , titanium , polymerization , chemistry , organic chemistry , polymer , composite material , metallurgy
A new way of directly synthesizing ethylene–styrene diblock copolymer by Ziegler–Natta catalysis was studied. It consists of using a soluble complex prepared by the reaction of\documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm polystyrene}\frac{{}}{{\overline {{\rm DP}_n } = x}}{\rm (butadiene)}\frac{{}}{{\overline {{\rm DP}_n } = 3}}{\rm Li} $$\end{document} with TiCl 4 in the ratio r = [Li]/[Ti] = 2 to initiate the formation of the polyethylene block. The well‐defined linear diblock structure was established both by GPC of the polyethylene block and by 13 C NMR and DSC analyses of the copolymer. Moreover, by using such a catalytic system, the efficiency was found to be 0.88 with respect to carbon‐titanium bond. This value is relatively high compared to those of conventional Ziegler‐Natta catalytic systems.