文献类型：会议论文

英文题名：Systematic study of alcohols based co-blowing agents for polystyrene foaming in supercritical CO2: Toward the high efficiency of foaming process and foam structure optimization

作者：Qiang, Wei[1];Zhao, Ling[1,2];Liu, Tao[1];Liu, Zhen[3];Gao, Xiulu[1];Hu, Dongdong[1,4]

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;[3]Frostburg State Univ, Dept Phys & Engn, Frostburg, MD 21532 USA;[4]Univ Texas Austin, Dept Chem Engn, Austin, TX 78712 USA

会议论文集：12th International Symposium on Supercritcal Fluids (ISSF)

会议日期：APR, 2018

会议地点：Antibes, FRANCE

语种：英文

外文关键词：Supercritical carbon dioxide; Polystyrene; Microcellular foaming; Co-blowing agent; Alcohols

摘要：A new method is presented to improve the efficiency of the supercritical CO2 foaming process and optimize the foam structure after evaluating the effect of alcohols as co-blowing agents on supercritical CO2 foaming polystyrene (PS). The simulations revealed that the solubility parameter of the blowing agents and the diffusion coefficient of CO2 for PS increased with the growth of chain length of alcohol. The addition of decanol decelerated the desorption rate of the blowing agents to maintain a higher content of blowing agents in PS, which resulted in the high cell density. Butanol improved the volume expansion ratio (VER) of the foams due to having the largest plasticization effect on PS. By combining the advantages of these two alcohols as a co-blowing agent, an optimized foam structure was obtained with smaller cell size (5.82 mu m) and larger VER (5.83) than that obtained when foaming with pure CO2. (C) 2019 Elsevier B.V. All rights reserved.