ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
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 TiCl4 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 13C 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.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1983.070280305
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