材料科学
膜
纺纱
纤维
乳状液
稀释剂
渗透
多孔性
中空纤维膜
化学工程
接触角
聚乙二醇
复合材料
煤油
PEG比率
热稳定性
聚合物
化学
有机化学
工程类
经济
生物化学
财务
作者
Dawei Ji,Yifei Gao,Wanning Wang,Haowei Feng,Kaikai Chen,Changfa Xiao
标识
DOI:10.1016/j.jece.2022.108337
摘要
Poly(vinylidene fluoride) (PVDF) is one of the most widely used membrane forming polymers with good processability, outstanding mechanical properties, excellent thermal and chemical stability. In this work, PVDF hollow fiber membranes were prepared through the melt spinning method with CaCl2 and PEG as the composite pore forming agents. The influence of different contents of CaCl2 and PEG on the membrane’s structure and properties were studied based on the pore size distribution, porosity, permeation flux, and oil/water separation test etc. There was no obvious dense layer on the PVDF hollow fiber membrane surface, which exhibited multiple pore structure. With the increase of PEG contents, the pore size, the porosity and oil flux improved effectively, correspondingly, the water contact angle and liquid entry pressure decreased. The permeation fluxes of kerosene also increased obviously with the increase of PEG contents, and the maximum flux of M-3 reached as high as 398.4 L·m-2·h-1. Applied to oil/water separation test, M-3 exhibited good oil/water separation performance, and its separation efficiency for water-in-kerosene emulsion can still reach more than 95 % after ten cycles. In particular, there were not any solvents and diluents used in the preparation process, which was a relatively green preparation process.
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