线性和长支链聚丙烯／氯化钠共混物的流变性能及发泡形态的研究  

Study on Rheological Property and Foam Morphology of Linear and Long Chain Branching PP/NaCl Blends

作　　者：黄锦涛[1] 何光建 廖霞[1] 张海琛[1] 

机构地区：[1]四川大学高分子科学与工程学院,高分子材料国家重点实验室,四川成都610065 [2]华南理工大学聚合物成型加工工程教育部重点实验室,广东广州510640

出　　处：《塑料工业》2012年第4期91-95,110,共6页China Plastics Industry

基　　金：教育部留学回国启动基金资助项目(20101174-4-3);国家自然科学基金(No.51103091)

摘　　要：制备了线性和长支链聚丙烯/氯化钠(NaCl)共混物,通过流变仪、差示扫描量热仪(DSC)及超临界二氧化碳发泡方法研究了共混物的流变性能、热性能及发泡形态。流变结果表明,紫外辐照挤出改性后的聚丙烯(PP)样品都接入了长支链,NaCl的加入没有改变长支链结构,且NaCl加入得越多,拉伸黏度越小。通过DSC可知,随着长支链的引入,聚丙烯的熔程变宽,结晶温度有所提升,而NaCl的加入使得结晶温度下降,熔点变化不大。通过紫外辐照反应挤出改性引入长支链可有效改善PP的发泡形态。加入致孔剂可制得开孔材料,开孔程度随着致孔剂的含量的增大而增大。Linear and long chain branching PP/NaCl composites were prepared. The rheological behavior, thermal properties and foam morphology of them were studied by rheological test, DSC and supercritical carbon dioxide foaming technology. Rheological test confirmed that under UV irradiation branching was achieved, and the long-chain branching structure was not changed by adding NaCl. The more NaCl added, the smaller the extensional viscosity. The results of DSC revealed that with the introducing of long chain branching, the melting range of the PP broadened and the crystallization temperature increased. Adding NaCl could make the crystallization temperature decreasing, and little change in melting point. The foam morphologies of long chain branching polypropylene were more uniform. Open-pore Foams can be obtained by porogen, the more content of porogen, the higher degree of open-pore was.

关 键 词：聚丙烯 长支链 氯化钠 流变性能 超临界二氧化碳 发泡 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业] TQ325.14