聚乳酸/羟丙基淀粉复合降解型材料的制备和表征  

The Preparation and Characterization of Poly(lactic acid)/Hydroxypropyl Starch Degradable Blend

作　　者：居学成[1,2] 尹建伟[2] 黄凌[1] 翟茂林[1] 

机构地区：[1]北京大学化学与分子工程学院,北京100871 [2]北京大学香港科技大学深圳研修院,广东深圳518057

出　　处：《塑料》2008年第6期67-69,共3页Plastics

基　　金：2006年深圳市科技研发资金深港创新圈计划项目(SG200617)

摘　　要：羟丙基改性淀粉作为填充剂,在偶联剂作用下与聚乳酸共混、挤出制备聚乳酸/羟丙基淀粉复合降解型材料。随着羟丙基改性淀粉含量的增加,共混材料的硬度略有增加、拉伸强度和断裂伸长率都先减小后增大,材料的吸水率和降解速率增加,且改性淀粉取代度的增加有利于提高材料的韧性。Hydroxypropyl starch （HPS）, used as a filling agent, was blended with poly （lactic acid） （PLA） in the presence of coupling agent to prepare a new degradable composite. With the increasing of starch content, the hardness of the blend was slightly increased;but the tensile strength and the elongation at break of the b/end were firstly reduced, then increased ; the water absorption and degradation rate of the blend were increased. Furthermore, the increased degree of substitution of HPS could enhance the toughness of PLA/ HPS blends.

关 键 词：聚乳酸 羟丙基淀粉 力学性能 吸水率 生物降解性 

分 类 号：TQ321[化学工程—合成树脂塑料工业]