聚偏氟乙烯
膜
聚乙烯醇
材料科学
化学工程
结晶度
生物污染
接触角
相位反转
多孔性
渗透
色谱法
高分子化学
复合材料
聚合物
化学
生物化学
工程类
作者
Lang Xu,Chenyang Wang,Shihua Qi,Hongjun Li,Hongwei Zhang,Dunwen Zuo
出处
期刊:Journal of Polymer Engineering
[De Gruyter]
日期:2022-12-28
卷期号:43 (3): 254-264
标识
DOI:10.1515/polyeng-2022-0198
摘要
Abstract Polyvinylidene fluoride (PVDF) membrane was prepared by a two-step method of surface gelation-immersion precipitation. The surface of the scraping solution film was sprayed with polyvinyl alcohol (PVA) aqueous solution to gel the film surface first, and then the liquid film was immersed in a coagulation bath for phase transformation to obtain the surface modified PVDF membrane. The effects of PVA solution with different mass fraction on the structure and properties of PVDF membrane were studied. The results showed that with the increase of spraying PVA mass fraction, the contact angle of the upper surface of PVDF membranes gradually decreased, the porosity and mean pore size of PVDF membranes gradually increased, and the crystallinity of PVDF membranes gradually decreased. The pores on upper surface of the membranes first increased and then decreased, and the finger-like macropore structure appeared inside the membranes, the water flux first increased and then decreased, and the rejection rate increased. Dynamic cycle filtration experiment of bovine serum protein (BSA) solution showed an increase in membrane flux recovery from 68.31 to 95.08% and a decrease in the irreversible fouling rate from 31.69 to 4.92%, indicating an improvement in the hydrophilicity and antifouling properties of the modified PVDF membrane.
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