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氯化亚锡/萘二磺酸对D,L乳酸聚合物微结构的影响(PDF)

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

Issue:
2009年03期
Page:
111-115
Column:
研究论文
publishdate:
2009-05-30

Article Info:/Info

Title:
The effects of SnCl2/naphthalene disulphonic acid on the microstructure of polymers prepared from D,Llactic acid
Author(s):
GAO Qinwei1 HE Gang2 LI Mingzi1 XU Baisen3
1.College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China; 2.College of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China; 3.College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China
Keywords:
DLlactic acid poly (lactic acid) optical activity stereoselectivity
Classification number :
O633.14
DOI:
10.3969/j.jssn.1000-2006.2009.03.026
Document Code:
A
Abstract:
Polys (lactic acid) was prepared from D,Llactic acid through melt polycondesation. Viscometry, polarimetry, 1HNMR, 13CNMR and XRD were performed to detect poly(lactic acid) (PLA) samples. PLA with excessive Lonformation units in polymer chains can be obtained using SnCl2 and naphthalene disulphonic acid (NDA) as catalyst system. Ratios of SnCl2 and NDA and its contents affected the opitical purities of PLAs, PLA microstructures of chains and cryticals. When SnCl2 content was 0.5% and n(SnCl2)/n(NDA) 1∶1, PLA with opitical purity 97.4% was then obtained from D,Llactic acid.

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Last Update: 2009-05-30