为提高疏水膜的疏水性能,使其可在膜蒸馏、膜吸收等领域有更广泛的应用.采用溶液相转移法制备超疏水性聚偏氟乙烯(PVDF)分离膜,考察了铸膜液中PVDE和非溶剂(低分子二醇类化合物PG)的浓度对膜润湿性能的影响.结果表明,通过改变铸膜液中PVDF、PG的浓度,能使PVDF膜的表面静态接触角从75.1°提高到161.7°,滚动角仅为15.8°.还研究了PVDF复合膜的制备条件对膜润湿性能的影响,结果表明,在一定的非溶剂浓度范围,增加复合膜涂覆液中非溶剂PG的加入量,有利于得到较高的复合膜表面接触角,但膜丝在涂覆液中的浸泡时间也需要相应延长.当非溶剂PG的质量分数为39.1%、浸泡时间为50 s时,复合膜表面接触角达到了155°.
Improving the hydrophobic property for hydrophobic membrane could make it have wider use in many areas, such as membrane distillation, membrane absorption, and so on.In this paper, we prapared the superhydrophobic polyvinylidene fluoride(PVDF)membranes by non-solvent induced phase separation, researched the influences of content of PVDF and non-solvent(low-molecular-weight diols PC-)in the casting solution on the hydrophobicity of membranes.The results showed that, by changing the content of PVDF and PG in the casting solution, the static contact angle of PVDF membrane surface could increase from 75.1° to 161.7°, and its scroll angle was reduced only 15.8°.This paper also studied the influences of the preparation conditions of PVDF composite membrane on the membrane hydrophobicity.The results showed that, non-solvent PG could increase the contact angle of membrane surface by increasing the PC-content in the coating solution, but it need longer dipping time in coating.When the content of non-solvent PG was 39.1% and the dipping time was 50 s, the contact angle of composite membrane surface could reach 155°.
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