文献类型：期刊文献

英文题名：Strategy to control CO2 diffusion in polystyrene microcellular foaming via CO2-philic additives

作者：Qiang, Wei[1];Hu, Dong-dong[1];Liu, Tao[1];Zhao, Ling[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Xinjiang Univ, Coll Chem & Chem Engn, Urumqi 830046, Peoples R China

年份：2019

卷号：147

起止页码：329

外文期刊名：JOURNAL OF SUPERCRITICAL FLUIDS

收录：;EI(收录号：20190206361026);WOS:【SCI-EXPANDED(收录号:WOS:000462690700036)】；

基金：The authors are grateful to National Natural Science Foundation of China (21706063, 21676092), National Key Research and Development Program of China (2016YFB0302201), and the Fundamental Research Funds for the Central Universities (22221714005). D. Hu also gratefully acknowledges the financial support from China Scholarship Council.

语种：英文

外文关键词：Supercritical carbon dioxide; Diffusion; CO2-philic additives; Polystyrene; Microcellular foaming

摘要：The introduction of suitable CO2-philic additives, enabling high CO2 concentration retained in the polymer matrix, might be a promising strategy to obtain foams with small cell size and large volume expansion ratio. The effect of molecular weight (M-n) (2000-17000 g/mol) of CO2-philic additives (PDMS and PVAc) on the diffusion of supercritical CO2 into and out of polystyrene (PS) was investigated via experiments and dissipative particle dynamics simulations. The CO2 diffusion coefficient increased with the presence of additives especially with PDMS (2000 g/mol, from 1.2 x 10(-9)m(2)/s to 2.8 x 10(-9)m(2)/s). Meanwhile, the saturation solubility of CO2 increase with the incorporation additives. Compared with high M-n additives, the slower CO2 desorption rate with additives with M-n of 2000 g/mol enabled higher amount of CO2 retained in PS, resulting in higher cell density. The incorporation of PDMS (2000 g/mol) decreased the cell size (from 11.67 to 7.57 mu m) and increased volume expansion ratio of PS foams.