文献类型：期刊文献

英文题名：Preparation of polyvinylidene fluoride (PVDF) membranes via nonsolvent induced phase separation process using a Tween 80 and H2O mixture as an additive

作者：Zhang, Ping-Yun[1]; Yang, Hu[1]; Xu, Zhen-Liang[1]

机构：[1] State Key Laboratory of Chemical Engineering, Chemical Engineering Research Center, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China

年份：2012

卷号：51

期号：11

起止页码：4388

外文期刊名：Industrial and Engineering Chemistry Research

收录：EI(收录号：20121314902486)

语种：英文

外文关键词：Hydrophobicity - Phase separation - Precipitation (chemical) - Body fluids - Fluorine compounds - Mixtures - Micelles - Thermodynamics

摘要：Polyvinylidene fluoride (PVDF) membranes were fabricated by the nonsolvent induced phase separation (NIPS) process using Tween 80 and H2O as a mixture additive from both 60 °C and room-temperature (RT) casting solution. Resultant PVDF membranes revealed improved pure water flux (PWF), enlarged mechanical properties, and well Bovine serum albumin (BSA) and Dextran rejection as a result of addition of water into the PVDF-DMAc-Tween 80 system. The improved performance was attributed to the existence of nonsolvent, which was solubilized by polar head groups of Tween 80 reverse micelle to form the water pool. Further, the interaction between polar head of surfactant and water provided a balance resistance to the interconnection between PVDF and hydrophobic chains of surfactant, which enhanced the thermodynamics stability of casting solution. During demixing process, water diffusion from the interior of casting solution, increased the precipitation rate and led to the insufficient crystallization process of polymer. Finally, the Tween 80 reverse micelle confined the movement of water in solution, making the fingerlike structure slim and confined, with the wall structure between macrovoids. ? 2012 American Chemical Society.