Structure regulation and ion transport characteristics of polyvinylidene fluoride nanoporous membranes

被引：0
|
作者：
Li B. [1 ]
Liu Z. [1 ]
Wang B. [1 ]
机构：
[1] State Key Laboratory of Chemical Engineering, Tsinghua University, Beijing
来源：
Wang, Baoguo (bgwang@tsinghua.edu.cn) | 2017年 / Materials China卷 / 68期
基金：
中国国家自然科学基金;
关键词：
Crystallization; Ion selectivity; Membrane; Polyvinylidene fluoride; Structure regulation;
D O I：
10.11949/j.issn.0438-1157.20160930
中图分类号：
学科分类号：
摘要：
A series of polyvinylidene fluoride (PVDF) porous membranes with different pore structures were prepared from PVDF and sodium allyl sulfonate (SAS) via various phase inversion methods, such as non-solvent induced phase separation (NIPS), vapor induced phase separation (VIPS), and solvent evaporation induced phase separation (EIPS). A concept for membrane structure regulation was proposed on the basis of growth mechanism of polymer crystalline which controlled crystal growth by solvent evaporation time. The membrane was characterized by scanning electron microscopy (SEM), Brunner-Emmet-Teller (BET), X-ray diffraction (XRD), differential scanning calorimetry (DSC), as well as permeability of protons (H+), tetravalent vanadium ions (VO2+), and other ions. With the increase of solvent evaporation time, spherulites in cross-sectioned membrane was increased gradually till all spherulites grew into each other, such that membrane porous structure changed significantly as well as membrane crystalline percentage and morphology were altered. The decreased membrane pore size improved selectivity for H+ relative to VO2+ from 12 to 73, which demonstrated high separation properties of the naonporous membrane. © All Right Reserved.
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页码：732 / 738
页数：6
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