文献类型：期刊文献

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] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, 830046, China; [3] Department of Physics and Engineering, Frostburg State University, Frostburg, MD, 21532, United States; [4] Department of Chemical Engineering, The University of Texas at Austin, Austin, TX, 78712, United States

年份：2020

卷号：158

外文期刊名：Journal of Supercritical Fluids

收录：EI(收录号：20195207901079)

语种：英文

外文关键词：Efficiency - Carbon dioxide - Supercritical fluid extraction - Structural optimization - Foams - Polystyrenes

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 μm) and larger VER (5.83) than that obtained when foaming with pure CO2. ? 2019 Elsevier B.V.