Bulky titanium bis(phenolate) complexes as novel initiators for living anionic polymerization of ε-caprolactone

被引：141

作者：

Takeuchi, D ^{[1
]}

Nakamura, T ^{[1
]}

Aida, T ^{[1
]}

机构：

[1] Univ Tokyo, Dept Chem & Biotechnol, Grad Sch Engn, Bunkyo Ku, Tokyo 1138656, Japan

来源：

MACROMOLECULES | 2000年 / 33卷 / 03期

关键词：

D O I：

10.1021/ma991441+

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Bulky bis(phenolate) complexes of titanium alcoholates were found to initiate living polymerization of epsilon-caprolactone, affording a polyester with a narrow molecular weight distribution. By changing the initial monomer-to-initiator mole ratio, the molecular weight of the polymer was controlled over a wide range. H-1 NMR studies on the produced polymer showed the presence of an alkoxy group originating from the initiator at the polymer terminal, indicating that the polymerization takes place at the titanium alcoholate bond of the initiator. Use of titanium complexes prepared with nonbridged hindered phenols or a less bulky bisphenol resulted in a poorly controlled chain growth or no polymerization.

引用

页码：725 / 729

页数：5

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