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.
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收藏
页码：163 / 170
页数：8
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