Stereochemical control in the anionic polymerization of beta-butyrolactone initiated with alkali-metal alkoxides

被引:73
作者
Jedlinski, Z
Kowalczuk, M
Kurcok, P
Adamus, G
Matuszowicz, A
Sikorska, W
Gross, RA
Xu, J
Lenz, RW
机构
[1] UNIV MASSACHUSETTS,DEPT CHEM,LOWELL,MA 01854
[2] UNIV MASSACHUSETTS,DEPT POLYMER SCI & ENGN,AMHERST,MA 01003
关键词
D O I
10.1021/ma951888s
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The anionic polymerization of (R)-beta-butyrolactone initiated with either 18-crown-6 complexes of a potassium alkoxide or a simple carboxylate (reference initiator) proceeded with inversion of configuration. As a result (R)-beta-butyrolactone formed an isotactic poly((S)-beta-hydroxybutyrate) with these initiators at room temperature. Polymerization of (R,S)-beta-butyrolactone under the same conditions gave an atactic polymer, but at lower temperatures the predominantly syndiotactic form of poly((R,S)-beta-hydroxybutyrate) was produced from the racemic monomer.
引用
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页码:3773 / 3777
页数:5
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