SYNDIOTACTIC POLY[(R,S)-BETA-HYDROXYBUTYRATE]ISOLATED FROM METHYLALUMINOXANE-CATALYZED POLYMERIZATION

被引：41

作者：

HOCKING, PJ ^{[1
]}

MARCHESSAULT, RH ^{[1
]}

机构：

[1] MCGILL UNIV,DEPT CHEM,3420 UNIV ST,MONTREAL H3A 2A7,QUEBEC,CANADA

来源：

POLYMER BULLETIN | 1993年 / 30卷 / 02期

关键词：

D O I：

10.1007/BF00296845

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Poly[(R,S)-A-hydroxybutyrate] was prepared via the methylaluminoxane-catalyzed polymerization of (R,S)-beta-butyrolactone, fractionated, and characterized by H-1 and C-13 nmr, gel permeation chromatography, differential scanning calorimetry, and x-ray diffraction. All the material isolated from these reactions was identified by nmr as poly(beta-hydroxybutyrate), but in each case, C-13 nmr showed that a portion of the material contained more syndiotactic than isotactic diads. Although this new syndiotactic material was low in molecular weight, it showed crystallinity by differential scanning calorimetry and x-ray diffraction, with d-spacings different in value and relative intensity from those of the isotactic polymer.

引用

页码：163 / 170

页数：8

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