【作者】 张晓惠； 黎厚斌； 顾文娟； 刘兴海；

【Author】 Xiaohui Zhang~(1,2),Houbin Li~2,Wenjuan Gu~2,Xinghai Liu~2 1.Hangzhou dianzi University,Hangzhou 310018,China;2.Wuhan University,Wuhan 430079,China

【机构】 杭州电子科技大学； 武汉大学；

【摘要】 壳聚糖与聚乳酸是具有良好性能的生物降解高分子材料,但二者都存在弊端。为了改善聚乳酸和壳聚糖的不足,将聚乳酸接枝到壳聚糖分子链上,以获得性能更优异的材料。本文以L-乳酸和壳聚糖为原料,在辛酸亚锡催化作用下,制备了壳聚糖-g-聚乳酸聚合物,采用FTIR、XRD对其结构进行表征;并用TG-DSC进行热分析,数据显示壳聚糖-g-聚乳酸的分解温度为230℃,其热性能稳定。同时将制得的壳聚糖-g-聚乳酸-聚乙二醇采用流延成膜法制成薄膜,并测试了膜材料的抗拉强度、断裂伸长率等力学性能。实验发现:在相同的反应条件下,聚乳酸-聚乙二醇不能成膜,而壳聚糖-g-聚乳酸-聚乙二醇体系的成膜性好,其断裂伸长率高达129%。更多还原

【Abstract】 Chitosan and polylactic acid(PLLA) are biocompatible polymers with good performance. However,there are some drawbacks in chitosan and PLLA.Therefore,the as-synthesized chitosan grafted by L-lactic acid(Chitosan-g-PLLA) was prepared to improve the performance of the PLLA and chitosan.In this paper,we prepared Chitosan-g-PLLA using L- lactic acid and chitosan as reactants and Tin(Ⅱ) 2-octanoate Sn(Oct)2 as catalyst.Meanwhile,the product molecular structures were characterized by FTIR and XRD.And the Thermal performance of chitosan-g-PLLA was characterized by TG-DSC,which results showed that the graft polymer began to degrade at 230℃.It had excellent thermal stability.At the same time,the Chitosan-g-PLLA-PEG films were prepared by tape casting.We also studied the tensile strength,tensile strength elongation at break,etc.,mechanical properties of the films.It was found that,in the same reaction conditions,PLLA-PEG couldn’t be made into film,while Chitosan-g-PLLA-PEG film had good film forming,and its tensile strength elongation at break was 129%.更多还原