程杨明在Polymer上发表文章


Wide liquid-liquid phase separation region enhancing tensile strength of poly(vinylidene fluoride) membranes via TIPS method with a new diluent

作者:Cui, ZL (Cui, Zhaoliang)[ 1,2,3 ] ; Cheng, YM (Cheng, Yangming)[ 1,2,3 ] ; Xu, K (Xu, Ke)[ 1,2 ] ; Yue, J (Yue, Juan)[ 1,2 ] ; Zhou, Y (Zhou, Yue)[ 1,2 ] ; Li, XG (Li, Xiaogang)[ 1,2 ] ; Wang, Q (Wang, Qian)[ 1 ] ; Sun, SP (Sun, Shi-Peng)[ 1,2 ] ; Wang, Y (Wang, Yong)[ 1,2 ] ; Wang, XZ (Wang, Xiaozu)[ 1 ] ...更多内容

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POLYMER


卷: 141

页: 46-53

DOI: 10.1016/j.polymer.2018.02.054

出版年:APR 11 2018

文献类型:Article

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摘要

Poly(vinylidene fluoride) (PVDF) membrane is widely used in water purification and wastewater treatment. In present paper, thermally induced phaseseparation (TIPS) was employed, and maleic acid dibutyl ester (DBM), a new diluent, was introduced for PVDF membrane preparation. Phase diagram and the effects of polymer concentration and quenching temperature on the structure, morphologies, properties, and performances of PVDF membraneswere investigated. During the quenching process of PVDF/DBM system, liquid-liquid phase separation happened, and PVDF membranes with a bi-continuous structure were fabricated. What is interesting is that the liquid-liquid phase separation region was much wider than other PVDF/diluentsystems. Thus, it is possible to fabricate PVDF membrane with a bi-continuous structure at high polymer concentrations, without stretching or additives. With the increase in polymer concentration and quenching temperature, mean pore size and pure water flux of the PVDF membrane decreased. Tensilestress of the prepared PVDF membranes reached to 6.18 MPa, because the wide liquid-liquid phase separation region induced a bi-continuous structure when the concentration of the PVDF membrane was at around 30%. (C) 2018 Elsevier Ltd. All rights reserved.