膜科学与技术

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Research on the cooperative regulation of the polar crystal
phase and permeability of PVDF membranes

Authors： CHANG Yanjiao, WANG Qizheng, WANG Yefei, KONG Xiao

Units： School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, China

KeyWords： electroactive PVDF membrane; “ion-dipole” interaction; crystal phase; permeability

ClassificationCode：TQ028; TB324

year,volume(issue):pagination： 2025,45(5):66-72

Abstract：

PVDF membranes with high-purity β-phase have numerous important innovative applications in fields such as catalysis and separation. The non-solvent induced phase separation (NIPS) method is one of the most common techniques for preparing PVDF membranes, but it faces the challenge of balancing the improvement of polar β-phase content and the enhancement of membrane permeability, as these two properties are often difficult to achieve simultaneously. In this study, based on the “ion-dipole” interaction between sodium oleate (SO) and PVDF, the effects of SO on the crystal structure, pore size distribution, separation performance and antifouling ability of PVDF membranes were investigated, and successfully prepared PVDF membranes with both high flux and high β-phase content. The results showed that the introduction of SO increased the β-phase content of the prepared PVDF membranes from 71% to 84%. Meanwhile, the water flux significantly increased from 267 L/(m2·h) to 412 L/(m2·h). Benefiting from the enhanced polar β-phase content, the antifouling ability of the PVDF membranes was also improved, with the flux recovery rate increasing from 41.5% to 81.4%. The SO-mediated β-phase regulation method based on “ion-dipole” interaction proposed in this study is simple and efficient, which holds important reference significance for the large-scale preparation and application of high-purity β-phase PVDF membranes.

Funds：

连云港市重大技术攻关-揭榜挂帅项目（CGJBGS2105)

AuthorIntro：

常延姣（1993-），女，山东邹城人，讲师，博士研究生，研究方向为压电膜材料的制备与应用

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