High-resolution C-13 and H-1 solution NMR study of poly(lactide)

被引：235

作者：

Thakur, KAM ^{[1
]}

Kean, RT ^{[1
]}

Hall, ES ^{[1
]}

Kolstad, JJ ^{[1
]}

Lindgren, TA ^{[1
]}

Doscotch, MA ^{[1
]}

Siepmann, JI ^{[1
]}

Munson, EJ ^{[1
]}

机构：

[1] UNIV MINNESOTA,DEPT CHEM,MINNEAPOLIS,MN 55455

来源：

MACROMOLECULES | 1997年 / 30卷 / 08期

关键词：

D O I：

10.1021/ma9615967

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

High-resolution 500 MHz solution-state H-1 and C-13 NMR spectra of various poly(lactides) indicate at least hexad stereosequence sensitivity. The poly(lactides) were prepared in vials by melt polymerization of various combinations of L-lactide, D-lactide, and meso-lactide at 180 degrees C for 3 h using tin(II) bis(2-ethylhexanoate) (tin(II) octoate) as the catalyst in a 1:10 000 ratio. The intensity distribution of the various stereosequence resonances in the NMR spectra indicates a preference for syndiotactic addition during the polymerization process. Minimal evidence of transesterification was observed for these polymerization conditions.

引用

页码：2422 / 2428

页数：7

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