A spectroscopic analysis of poly(lactic acid) structure
A spectroscopic analysis of poly(lactic acid) structure
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DOI：
10.1021/ma0016026
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发表时间：
2001-06-19
期刊：
影响因子：
5.5
通讯作者：
Yang, XZ
中科院分区：
文献类型：
--
作者：
Kang, SH;Hsu, SL;Yang, XZ
用振动分析法研究了聚乳酸在结晶状态下的链构象。结合一个正常的坐标分析，拉曼光谱已经产生了有关构象分布的数据。不同螺旋的拉曼光谱模拟使用以前公布的结构，力常数和强度参数。一些预测的链构象与数据不一致。构象分析预测的四种3（1）螺旋结构中只有一种与实验结果吻合较好。该分析提供了关于聚乳酸的10（3）或3（1）螺旋的相对概率的新理解。
A vibrational analysis has been carried out to analyze the chain conformation of poly(lactic acid) in the crystalline state. In conjunction with a normal-coordinate analysis, the Raman spectrum has yielded data regarding conformational distributions. Raman spectra of different helices were simulated using previously published structures, force constants, and intensity parameters. Some of the chain conformations predicted are inconsistent with the data. Only one of the four 3(1) helical structures predicted by conformational analysis agrees well with experiment. This analysis provides a new understanding regarding the relative probability of a 10(3) or 3(1) helix for poly(lactic acid).