English Abstract
Precision Polymerization of Butadiene
Kiyoshi ENDO and Kenji NAKATANI
Graduate School of Engineering, Osaka City University, Sumiyoshi-ku, Osaka, Japan
Nippon Gomu Kyokaishi,(2007),80(1),13-18 General Review in Japanese

This review describes a precision polymerization of 1,3-butadiene(Bd) with metallosalen/MAO catalysts
[metal = Co, Ni, Fe, V, Ti; salen = N,N'-bis(salicylidene)ethylenediamine]. 1,4-cis selectivity and molecular weight control of the polymer of Bd with various metallosalen/MAO catalysts was investigated. Among metallosalen/MAO catalysts examined, the alkyl substituted in the aromatic ring of the (salen)Co(II) gave high molecular weight polymer with high 1,4-cis content. In the polymerization of Bd, both polymer yields and 1,4-cis contents increased by introducing bulky groups at suitable positions of (salen)Co(II) complexes. Simultaneous control of 1,4-cis selectivity and molecular weight of polymer was achieved with the (salen)Co(II)/MAO catalyst which possessed tert-butyl groups at suitable positions in the aromatic rings and ethylene diamine groups substituted with phenyl group. The copolymerization of styrene and Bd with (salen)Ni(II)/MAO catalyst was also investigated.

Precision Polymerization, 1,3-Butadiene, Metallosalen, (Salen)Co(II), (Salen)Ni(II), Methylaluminoxane, Stereoselectivity, Molecular Weight Control, Copolymerization, Styrene