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D, L-乳酸的立构选择性聚合(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2008年03期
Page:
43-47
Column:
研究论文
publishdate:
2008-05-20

Article Info:/Info

Title:
Stereoselective polymerization of D, L-lactic acid
Article ID:
1000-2006(2008)03-0043-05
Author(s):
GAO Qin-wei1 LI Ming-zi2 DONG Xiao1
1. College of Chemical Engineering Nanjing Forestry University, Nanjing 210037, China; 2. Library of Nanjing Forestry University, Nanjirtg 210037, China
Keywords:
Lactic acid Poly (lactic acid) Stereoselective polymerization Polycondesation Optical purity
Classification number :
O633.14
DOI:
10.3969/j.jssn.1000-2006.2008.03.010
Document Code:
A
Abstract:
D, L-lactic acid was polymerized through melt polycondesation in order to prepare poly(lactic acid) with high optical properly. Polarimetry, FT-1R, DSC, 1H-and 13C-NMR were used to detect microstructure, molecular weight, and optical purity of poly (lactic acid) samples. Racemic PDLLA was prepared from D,L-lactic acid with Sn powder as catalyst or without catalyst. Both SnCl2/p-toluenesulfonic acid system and SnCl2/o-toluenesulfonic acid systern could be used as catalyst to obtain PDLLA with higher molecular weight(M,>20 000), lower dispersity (being 1. 1), and higher optical purity (70. 5%) due to excessive L-conformation units in polymer chain. Poly(lactic acid) with high optical purity prepared from D, L-lactic acid could effectively low the cost of poly(lctic acid) materials.

References

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Last Update: 2013-05-20