聚乳酸/聚丙烯共混体系的制备及其发泡行为研究  

Study on Preparation of Poly(lactic acid)/Polypropylene Blends and Its Foaming Behavior

作　　者：王青松[1] 王向东[1] 刘伟[1] 刘本刚[1] 许国志[1] 张玉霞[1] 陈士宏[1] 

机构地区：[1]北京工商大学材料与机械工程学院材料科学与工程系,北京100048

出　　处：《中国塑料》2013年第2期80-85,共6页China Plastics

基　　金：科技部科研院所技术开发研究专项(2011EG111244);北京市属高校人才强教计划项目(PHR201108078)

摘　　要：采用马来酸酐接枝聚丙烯(MAH-g-PP)作为相容剂,制备了聚乳酸(PLA)/聚丙烯(PP)共混物体系并研究了其发泡行为。采用差式扫描量热仪和旋转流变仪分别研究其热行为和流变行为,采用扫描电镜观察了共混体系的冲击断面形貌及泡孔形态。结果表明,随着MAH-g-PP添加量的增加,共混体系的相容性得到提高,加入PP促进了PLA的结晶,当MAH-g-PP含量达到7%时,PLA的绝对结晶度达到6.07%,同时加入PP提高了PLA/PP共混体系的熔体强度,使其发泡行为得到改善,共混体系的发泡倍率最大可以达到8.1倍。Foaming behavior of poly（lactic acid） /polypropyiene （PP） blends prepared with maleic anhydride grafted PP （MAH-g-PP） as a reactive compatibilizer were studied. Thermal and rheological behaviors of PLA/PP blends were investigated using differential scanning calorimetry and dynamic rheometer, respectively. Morphologies of impact fractured and foamed samples were observed by scanning electron microscopy. Compatibility of PLA/PP blends was improved gradually with increasing adding of MAH-g-PP, which could promote the growth rate of PLA spherulites and improve the melt strength of PLA/PP blends. The degree of crystallinity of PLA could reach 6.07%, and the expansion ratio of PLA/PP blend could reach 8. 1 when MAH-g-PP content was 7%.

关 键 词：聚乳酸 聚丙烯 相容性 熔体强度 发泡行为 

分 类 号：TQ328[化学工程—合成树脂塑料工业]