文献类型：期刊文献

英文题名：Stabilization of CO2-in-water emulsions by nonfluorinated surfactants with enhanced CO2-philic tails

作者：Bao, Lei[1]; Fang, Shuyi[1]; Hu, Dongdong[1]; Zong, Yuan[1]; Zhao, Ling[1]; Yuan, Weikang[1]; Liu, Tao[1]

机构：[1] Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2018

卷号：133

起止页码：163

外文期刊名：Journal of Supercritical Fluids

收录：EI(收录号：20181004854613)

语种：英文

外文关键词：Carbon dioxide - Emulsification - Hydrophilicity - Surface active agents - Polymerization - Emulsions - Polyvinyl acetates

摘要：Several amphiphilic nonfluorinated polymers, poly(vinyl acetate)-block-poly(dimethylaminoethyl methacrylate) (PVAc-b-PDMAEMA) and poly(vinyl acetate-alt-diethyl maleate) (PVDBM)-b-PDMAEMA with different ratios of CO2-philic and hydrophilic groups, were synthesized using RAFT/MADIX polymerization and ATRP. Stability measurements revealed that PVDBM8-b-PDMAEMA22 could emulsify 80% CO2 in H2O, with stable CO2-in-water (C/W) emulsions observed for more than 48 h under 20.0 MPa at 25 °C, which was 20 times longer than PVAc-b-PDMAEMA did. The optimal degree of polymerization (DP) for CO2-philic groups in PVDBM-b-PDMAEMA was 8, because increasing the DP of PVDBM increased the CO2-philicity, whereas increased molecular weight limited the miscibility in water. Molecular dynamics simulations were applied to determine the hydrophilic/CO2-philic balance (HCB). It was found that enhanced CO2-philic tails widened the HCB range, and the optimal range of the HCB was varied with CO2-philic tail types. Both experimental and simulation results demonstrated that enhancing the CO2-philicty of surfactant tails can improve the stability of C/W emulsions. ? 2017 Elsevier B.V.