摘要
以D，L-乳酸为原料，采用不同的催化剂，熔融缩聚制备了聚乳酸，采用旋光度法、核磁共振法、差示扫描量热法和X-射线衍射等方法研究了聚乳酸的结构与性能，探讨了催化剂对聚乳酸的立体构型的影响。D，L-乳酸分别以氯化亚锡、对甲苯磺酸和萘磺酸为催化剂或自催化聚合时均得到消旋的聚乳酸。而SnCl2／对甲苯磺酸、SnCl2／萘磺酸催化体系都具有立构选择性，可以催化D，L-乳酸的熔融缩聚，制备以L-构型为主的光学活性的聚乳酸。
Poly（lactic acid）s were prepared from L-and D, L-lactic acid respectively through melt polycondesation. Polarimetry, DSC, 1^H-and 13^C-NMR were performed to detect microstructure of poly（lactic acid） samples. Racemic PDLLA was prepared from D,L-lactic acid without additional catalyst, while PLA with low opitical purity with SnCl2, p-toluenesulfonic acid or naphthalenesulfonic acid as catalyst. Both SnCl2/p-toluenesulfonic acid system and SnCl2/naphthalenesulfonic acid system can be used as catalyst to obtain PDLLA with and higher opitical property due to excessive L-conformation units in polymer chain.
出处
《中国材料科技与设备》
2008年第5期84-87,共4页
Chinese Materials Science Technology & Equipment
基金
国家自然科学基金资助项目（50573032）
关键词
D
L-乳酸
聚乳酸
缩聚反应
光学纯度
立构选择性
D, L-lactic acid
Poly（lactic acid）
Polycondensation
Opitical purity
Stereoselectivity
