生物可降解聚乳酸的制备及其性能研究  

Study on Properties of Biodegradable PLA and Its Preparation

作　　者：贾玉亮[1] 刘晨光[1] 贺爱华[1] 

机构地区：[1]青岛科技大学高分子科学与工程学院橡塑材料与工程教育部重点实验室,山东青岛266042

出　　处：《塑料科技》2013年第6期57-62,共6页Plastics Science and Technology

基　　金：国家自然科学基金项目(50973123)

摘　　要：以L-乳酸(LLA)为原料合成L-丙交酯,通过L丙交酯开环聚合制备高分子量的聚乳酸(PLA)。考察反应温度、反应时间以及催化剂用量对PLA的影响,获得优化的聚合工艺条件。GPC测得PLA的重均分子量可达21.9×104g/mol。FTIR和旋光度测试表明产物为聚L-乳酸(PLLA)。DSC和XRD测试证明:PLLA为结晶性材料,熔点为170℃,属于α'-和α-相共存的混合晶型。拉伸测试表明:高分子量的PLLA具有良好的力学性能。High molecular weight poly（lactic acid）（PLA） was prepared by ring-opening polymerization of/-lactide, which was synthesized from L-lactic acid（LLA）. The influences of the reaction temperature, reaction time and amount of catalyst on the PLA were investigated, and the optimized polymerization conditions were obtained. The weight-average molecular weight of PLA could reach up to 21.9×104 g/mol by GPC measurement. Both FTIR and optical rotation verified that the PLA synthesized was Poly（/-lactic acid）（PLLA）. DSC and XRD testa show that the PLLA is a crystalline material with melting-point at 170℃ and mixed α/ and α- crystal phases. The tensile test shows that PLLA with high molecular weight has excellent mechanical properties.

关 键 词：L-乳酸 L-丙交酯 聚乳酸 高分子量 结晶性 力学性能 

分 类 号：TQ321.2[化学工程—合成树脂塑料工业]