文献类型：期刊文献

英文题名：Effects of Mixed Solvents and PVDF Types on Performances of PVDF Microporous Membranes

作者：Li, Qian[1,2];Xu, Zhen-Liang[1,2];Yu, Li-Yun[2]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Membrane Sci & Engn R&D Lab, Chem Engn Res Ctr, Shanghai 200237, Peoples R China

年份：2010

卷号：115

期号：4

起止页码：2277

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20100212634303);WOS:【SCI-EXPANDED(收录号:WOS:000272893400045)】；

基金：Contract grant sponsor: National "Eleventh Five-Year" Important Science and Technology Supporting Plan; contract grant number: 2006BAEO2A01.

语种：英文

外文关键词：polyvinylidene fluoride; mixed solvent; precipitation rate; microporous flat membrane

摘要：Polyvinylidene fluoride (PVDF) microporous flat membranes were cast with different kinds of PVDFs and four mixed solvents [trimethyl phosphate (TMP)-N,N-dimethylacetamide (DMAc), triethyl phosphate (TEP)-DMAc, tricresyl phosphate (TCP)-DMAc, and tri-n-butyl phosphate (TBP)-DMAc]. The effects of different commercial PVDFs (Solef(R) 1015, FR 904, Kynar 761, Kynar 741, Kynar 2801) on membrane morphologies and membrane performances of PVDF/TEP-DMAc/PEG200 system were investigated. The membrane morphologies were examined by scanning electron microscopy (SEM). The membrane performances in terms of pure water flux, rejection, porosity, and mean pore radius were measured. The membrane had the high flux of 143.0 +/- 0.9 L m(-2) h(-1) when the content of TMP in the TMP-DMAc mixed solvent reached 60 wt %, which was 2.89 times that of the membrane cast with DMAc as single solvent and was 3.36 times that of the membrane cast with TMP as single solvent. Using mixed solvent with different solvent solubility parameters, different morphologies of PVDF microporous membranes were obtained. TMP-DMAc mixed solvent and TEP-DMAc mixed solvent indicated the stronger solvent power to PVDF due to the lower solubility parameter difference of 1.45 MPa1/2 and the prepared membranes showed the faster precipitation rate and the higher flux. The less macrovoids of the membrane prepared with TEP (60 wt %)-DMAc (40 wt %) as mixed solvent contributed to the higher elongation ratio of 96.61% +/- 0.41%. Therefore, using TEP(60 wt%)-DMAc (40 wt %) as mixed solvent, the casting solution had the better solvent power to PVDF, and the membrane possessed the excellent mechanical property. The microporous membranes prepared from casting solutions with different commercial PVDFs exhibited similar morphology, but the water flux increased with the increment of polymer solution viscosity. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 115:2277-2287, 2010