文献类型：期刊文献

英文题名：Dual role of PDMS on improving supercritical CO2 foaming of polypropylene: CO2-philic additive and crystallization nucleating agent

作者：Qiang, Wei[1];Zhao, Ling[1,2];Gao, Xiulu[1];Liu, Tao[1];Liu, Zhen[3];Yuan, Wei-Kang[1];Hu, Dongdong[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Xinjiang Univ, Coll Chem & Chem Engn, Urumqi 830046, Peoples R China;[3]Frostburg State Univ, Dept Phys & Engn, Frostburg, MD 21532 USA

年份：2020

卷号：163

外文期刊名：JOURNAL OF SUPERCRITICAL FLUIDS

收录：;EI(收录号：20202108701108);WOS:【SCI-EXPANDED(收录号:WOS:000543421900016)】；

基金：The authors are grateful to National Key Research and Development Program of China (2016YFB0302200), National Natural Science Foundation of China (21706063, 21676092), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Supercritical CO2; Foaming; Polypropylene; Polydimethylsiloxane

摘要：A systematic study was done to screen for the polydimethylsiloxane (PDMS) with molecular weight (Mw) from 770 g/mol to 17,000 g/mol to optimize the supercritical CO2 foaming process of semi-crystalline polypropylene (PP). The solubility and diffusion measurements demonstrated that the high solubility and slow desorption rate of CO2 were achieved in PP/PDMS blends via incorporating PDMS. Rheology results showed the viscosity of PP/PDMS blends increased with the increase of Mw of PDMS. The crystallization behaviors of PP and PP/PDMS blends were thoroughly investigated in the presence of CO2. PDMS with Mw from 4000 g/mol to 9000 g/mol enhanced the crystallization of the blend evidently. Since PDMS with medium Mw could work as a CO2-philic additive and crystallization nucleating agent in PP, the resultant foams exhibited a more uniform cellular morphology with smaller cell size (decreased from 23 to 13 mu m) and higher cell density compared with that of PP foam. (C) 2020 Elsevier B.V. All rights reserved.