文献类型：期刊文献

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

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

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

机构：[1]Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;[2]State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;[3]Shanghai Key Laboratory of Catalysis Technology for Polyolefin, Shanghai Research Institute of Chemical Industry, Shanghai 200062, China

年份：2016

卷号：10

期号：3

起止页码：396

中文期刊名：Frontiers of Chemical Science and Engineering

外文期刊名：化学科学与工程前沿（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2015_2016】；PubMed;

基金：Acknowledgements 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

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

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 poly- dimethylsiloxane （PDMS） through a one-step melt extru- sion 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.
Foamable high melt strength polypropylene （HMSPP） was prepared by grafting styrene （St） onto polypropylene （PP） and simultaneously introducing poly- dimethylsiloxane （PDMS） through a one-step melt extru- sion 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.