作　　者： ; ; ; ;

机构地区： 大连理工大学材料科学与工程学院

出　　处： 《高分子材料科学与工程》 2007年第2期92-95,共4页

摘　　要： 以环烷氧锡化合物引发L-丙交酯开环聚合制备高分子量聚L-乳酸。考察了单体引发剂配比、聚合温度和聚合时间等聚合条件对聚合产物特性黏度的影响。用1H-NMR、13C-NMR分析聚合产物微观结构表明,环烷氧锡引发L-丙交酯开环聚合是基于酰氧键断裂开环聚合的“配位-插入”机理。DSC、TGA、XRD等测试结果表明,所得聚L-乳酸具有较高的结晶度和立构规整度。 Poly（L-lactide） （PLLA） was synthesized by ring-opening polymerization of L-lactide using cyclic tin alkoxide compound as initiator. Effects of initiator concentration, polymerization temperature and time on the polymers molecular weight were investigated. The experimental results show that high molecular weight PLLA can be obtained by control of the polymerization conditions. The microstructure and stereosequences of PLI.A were characterized by ^1H-, ^13C- NMR. The analysis results verified that ring-opening polymerization of L-lactide initiated with cyclic tin alkoxide may proceed through ＂coordinative-insertion＂ mechanism based on the acyloxygen cleavage of L-lactide ring, and the propagation process was proposed. The synthetic PI.I.A exhibited a high crystallinity of around 40%-50% and no glass transition temperature observed from DSC curves. The thermogravimetry analysis illustrated that the thermal decomposition temperature of PLI.A is around 300 ℃. The tensile properties of polymer films prepared by solution coating were also measured.

关 键 词： 丙交酯 聚 乳酸 环烷氧锡 聚合机理 生物可降解

领　　域： [化学工程]