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Copolymerization of Butadiene and Styrene with a Gadolinium Tricarboxylate Catalyst by Eiichi Kobayashi; Shojiro Kaita; Sadahito Aoshima; Junji Furukawa is a Materials Science article available to read on EtoBox.

What is Copolymerization of Butadiene and Styrene with a Gadolinium Tricarboxylate Catalyst about?

## Abstract Homo‐ and copolymerizations of butadiene (BD) and styrene (St) were carried out by gadolinium catalysts having various tricarboxylate ligands [Gd(OCOR)~3~: R = CH~3~, CH~2~Cl, CHCl~2~, CCl~3~, and CF~3~], to investigate the effects of ligands and discuss the __cis__ polymerization mechanism. Polymerization of BD with Gd(OCOR)~3~—(__i__—Bu)~3~Al—Et~2~AlCl catalysts was carried out in hexane at 50°C. By each catalyst, poly(BD) having a high __cis__ content (__cis__ = 97–99%) in 22–85% yields for 2–24 h were obtained. The ligands with low pKa values increased the polymerization activity as follows: R of Gd(OCOR)~3~: CF~3~ > CCl~3~ > CHCl~2~ > CH~2~Cl ∼ CH~3~. On the other hand, in the polymerization of St or copolymerization of BD and St under similar conditions, the highest activity was attained by a Gd(OCOCCI~3~)~3~‐ based catalyst. The difference in the optimum ligand among the homo‐ and copolymerization of BD and St was discussed on the basis of energy levels of the catalysts. In the copolymers of BD and St, the __cis__‐1,4 content of the BD unit decreased with increasing St content. Furthermore, according to the diad analysis of copolymers (St content ∼ 14.5 mol %) by

Who reads Copolymerization of Butadiene and Styrene with a Gadolinium Tricarboxylate Catalyst?

Author

Eiichi Kobayashi; Shojiro Kaita; Sadahito Aoshima; Junji Furukawa

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0887-624X)

Published

1995

Language

EN

Field

Materials Science (Physical Sciences)