Catalytic synthesis of a monodisperse olefin block copolymer using a living polymerization system

被引：12

作者：

Cai, Zhengguo ^{[1
]}

Nakayama, Yuushou ^{[1
]}

Shiono, Takeshi ^{[1
]}

机构：

[1] Hiroshima Univ, Grad Sch Engn, Dept Appl Chem, Higashihiroshima 7398527, Japan

来源：

MACROMOLECULAR RAPID COMMUNICATIONS | 2008年 / 29卷 / 06期

关键词：

block copolymers; catalytic synthesis; living polymerization; olefins; single-site catalyst; triisobutylaluminium;

D O I：

10.1002/marc.200700687

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Polymerization of norbornene has been conducted with [t-BuNSiMe2(3,6-t-BU(2)Flu)]TiMe2 (1) in toluene at 20 degrees C using modified methylaluminoxane that contained 0.4 mol-% of triisobutylaluminium (TIBA) (dMMAO(0.4)) or 1.8 mol-% of TIBA (dMMAO(1.8)). The 1-dMMAO(0.4) catalytic system undergoes a living polymerization of norbornene. The catalysis of norbornene and propylene with the 1-dMMAO(1.8) catalytic system gives markedly different results because of differences in transfer times of the polymers from Ti to TIBA. The successive addition of norbornene and propylene before the complete consumption of the norbornene in the 1-dMMAO(1.8) system gives monodisperse PNB-block-poly(propylene-ran-norbornene)block-PP terminated with a Ti-PP bond, which is exchanged with TIBA. Hence the repeated addition of the same amount of norbornene and propylene realizes the catalytic synthesis of monodisperse block copolymer in this system.

引用

页码：525 / 529

页数：5

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