文献类型：期刊文献

英文题名：Polydimethylsiloxane assisted supercritical CO2 foaming behavior of high melt strength polypropylene grafted with styrene

作者：Wang, Weixia[1];Zhou, Shuai[1];Xin, Zhong[1,2];Shi, Yaoqi[1,3];Zhao, Shicheng[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[3]Shanghai Res Inst Chem Ind, Shanghai Key Lab Catalysis Technol Polyolefin, Shanghai 200062, Peoples R China

年份：2016

卷号：10

期号：3

起止页码：396

外文期刊名：FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING

收录：;EI(收录号：20163002647244);WOS:【SCI-EXPANDED(收录号:WOS:000382436900006)】；

基金：This work was financially supported by National Natural Science Foundation of China (Grant Nos. 21476085 and 21306047), Fundamental Research Funds for the Central Universities of China (22A201514016; 222201314051).

语种：英文

外文关键词：high melt strength polypropylene (HMSPP); polydimethylsiloxane (PDMS); supercritical CO2; foaming behavior

摘要：Foamable high melt strength polypropylene (HMSPP) was prepared by grafting styrene (St) onto polypropylene (PP) and simultaneously introducing polydimethylsiloxane (PDMS) through a one-step melt extrusion process. The effect of PDMS viscosity on the foaming behavior of HMSPP was systematically investigated using supercritical CO2 as the foaming agent. The results show that the addition of PDMS has little effect on the grafting reaction of St and HMSPP exhibits enhanced elastic response and obvious strain hardening effect. Though the CO2 solubility of HMSPP with PDMS (PDMS-HMSPP) is lower than that of HMSPP without PDMS, especially for PDMS with low viscosity, the PDMS-HMSPP foams exhibit narrow cell size distribution and high cell density. The fracture morphology of PDMS-HMSPP shows that PDMS with low viscosity disperses more easily and uniformly in HMSPP matrix, leading to form small domains during the extrusion process. These small domains act as bubble nucleation sites and thus may be responsible for the improved foaming performance of HMSPP.