膜科学与技术

高疏水表面的聚偏氟乙烯中空纤维膜制备方法研究

作者：张如意，吕晓龙，汪洋，武春瑞，陈华艳，贾悦，王暄，高启君

单位：中空纤维膜材料与膜过程国家重点实验室培育基地，生物化工研究所，天津工业大学，天津300387

关键词：聚偏氟乙烯；相转化；疏水改性；接触角；疏水膜

出版年,卷(期):页码： 2015,35(5):13-17

摘要：

本文采用稀溶液相转化法制备出小粒径的聚偏氟乙烯（PVDF）粒子，然后通过超滤方法将其涂覆在PVDF基膜表面上，得到了高疏水性表面的PVDF疏水膜. 初步考察了凝固浴组成和凝固浴温度等稀溶液相分离条件对PVDF粒子的形成以及疏水膜性能的影响. 结果表明，通过稀溶液相转化方法可以在基膜表面构建微纳米结构，凝固浴组成对改性疏水膜的表面微纳米结构影响很大，以质量分数为60% DMAc水溶液为凝固浴条件下得到的疏水膜接触角最高，达到144.9 °，较基膜的接触角80 °显著提高；凝固浴组成对疏水膜的透气系数和透水压力也有影响，透水压力由0.24 MPa提升至0.28 MPa；凝固浴组成对改性后疏水膜的孔径没有明显影响；随着凝固浴温度的升高，接触角呈增大趋势.

Dilute solution phase inversion method was used in this paper to prepare nano-size particlesof polyvinylidene fluoride(PVDF), which were then coated on the surface of PVDF hollow fiber membrane to form a highly hydrophobic surface ofPVDF membraneby ultrafiltration.The effects of the composition of the coagulation bath, the temperature ofthe coagulationbath and other conditions of the dilute solution phase separation on the hydrophobicity of modified PVDF membrane were investigated.Theresults showed thatthe surface with a micro and nano structures could be constructed on the support membrane by ultrafiltrating the nano-size particles prepared withthe dilute solution phase inversion method and its property was affected greatly by the composition of the coagulation bath, and when the coagulation bathcomposition was 60% DMAc aqueous solution,the prepared particles had the best nanostructure, the contact angle of hydrophobic membrane prepared with these particles was highest, reaching 144.6 °which was muchhigher than the 80 °contact angle of the support membrane; the gaspermeability coefficientand the water permeability pressure ofthehydrophobic membrane were also affected by the coagulation bath composition, thewaterpermeable pressure increased from 0.24 MPa to 0.28 MPa; the composition of the coagulation bath had noobvious effect on the pore size of the hydrophobic membrane; The contact anglesof the hydrophobic membraneswere an increasing trendwiththe coagulationtemperatureincrease, which were made from the particles prepared with different coagulation temperature.

张如意（1988-），男，河北衡水人，硕士，从事膜材料研究.*通讯作者，E-mail：luxiaolong@263.net

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