Microstructural analysis of poly[(L,L-lactide)-co-(glycolide)] by H-1 and C-13 nmr spectroscopy

被引：88

作者：

Kasperczyk, J

机构：

[1] Institute of Polymer Chemistry, Polish Academy of Sciences

来源：

POLYMER | 1996年 / 37卷 / 02期

关键词：

poly[(L; L-lactide)-co-(glycolide); microstructure; transesterification;

D O I：

10.1016/0032-3861(96)81088-3

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 C-13 nuclear magnetic resonance (n.m.r.) spectra were found to provide a means for direct observation of the structures formed along the glycolide/lactide copolymer chain upon transesterification. Nevertheless H-1 n.m.r. spectroscopy appeared to be more convenient and useful in the analysis of chain microstructure. The glycolide methylene group region of the proton spectra exhibits several signals which can be ascribed to longer sequences (as compared to those giving rise to C-13 resonances) as well as to the sequences which can appear only as a result of the second mode of transesterification. The analysis revealed that the longest blocks were in the copolymers prepared with Al(acac)(3) as the initiator and the shortest blocks were in the copolymers obtained with tin initiators. A decrease in temperature was found to reduce the extent of the second mode of transesterification.

引用

页码：201 / 203

页数：3

共 11 条

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[2]

COWSAR DR, 1985, METHOD ENZYMOL, V112, P101

[3]

GHIES C, 1992, MICROCAPSULES NANOPA, pCH3

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