线形聚丙烯/低密度聚乙烯发泡体系的结晶行为研究  

Crystallization Behavior of Linear Polypropylene/Low-density Polyethylene Foaming Systems

作　　者：刘伟[1] 刘本刚[1] 王向东[1] 许国志[1] 张玉霞[1] 

机构地区：[1]北京工商大学材料科学与工程系,北京100048

出　　处：《中国塑料》2010年第12期63-71,共9页China Plastics

基　　金：北京市教育委员会科技发展计划面上项目(KM200810011009);北京市教育委员会科技发展计划面上项目(KM200910011006);科技部科研院所技术开发研究专项资金项目(2008EG111015)

摘　　要：通过差示扫描量热仪研究了不同比例线形聚丙烯(PP)/低密度聚乙烯(PE-LD)共混发泡体系的结晶熔融行为和非等温结晶动力学,并使用热台偏光显微镜对线形PP/PE-LD共混发泡体系的结晶形态进行了表征。结果表明,PE-LD的加入会降低线形PP的结晶峰温和绝对结晶度,但对其熔融行为影响不显著;而通过非等温结晶动力学研究表明,PE-LD支链的成核作用,改变线形PP结晶过程中的成核和增长方式能够增加球晶数的同时降低球晶半径,形成的晶核具有物理交联点作用,有效地提高了共混物的熔体强度,增加了共混体系的可发性。Linear polypropylene was blended with low-density polyethylene, and the crystallization behavior was studied by DSC/POM. It showed that low-density polyethylene could decrease the peak crystallization temperature and the absolute erystallinity of linear polypropylene, however, the melt behavior was slightly affected. Moreover, the non-isothermal crystallization kinetics study showed that low-density polyethylene could also increase the amount and reduce the size of spherulites by changing the crystallization nucleation behavior of linear polypropylene. As a consequence, the foaming potentiality of the blends was enhanced.

关 键 词：线形聚丙烯 低密度聚乙烯 发泡 结品行为 结晶动力学 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]