超疏水聚偏氟乙烯复合微孔膜的制备及性能

doi:10.16085/j.issn.1000-6613.2017-0777

化工进展 ›› 2018, Vol. 37 ›› Issue (02): 673-680.DOI: 10.16085/j.issn.1000-6613.2017-0777

超疏水聚偏氟乙烯复合微孔膜的制备及性能

王志英¹, 韩承志¹, 于泳波¹, 邓会宁², 李春利¹

1 河北工业大学化工学院, 天津 300130;
2 河北工业大学海洋学院, 天津 300130

收稿日期:2017-04-27 修回日期:2017-07-24 出版日期:2018-02-05 发布日期:2018-02-05
通讯作者: 李春利,教授,主要研究方向为化工分离过程。
作者简介:王志英(1977-),女,博士,副教授,主要从事膜分离技术方向的研究。E-mail:ctstwzy@163.com。
基金资助:
河北省高等学校科学技术研究重点项目（ZD2015107）及河北省重点研发计划项目国际合作专项项目（17393601D）。

Preparation and properties of superhydrophobic PVDF microporous composite membrane

WANG Zhiying¹, HAN Chengzhi¹, YU Yongbo¹, DENG Huining², LI Chunli¹

1 College of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China;
2 College of Marine Science and Engineering, Hebei University of Technology, Tianjin 300130, China

Received:2017-04-27 Revised:2017-07-24 Online:2018-02-05 Published:2018-02-05

摘要/Abstract

摘要： 提出了一种超疏水聚偏氟乙烯（PVDF）复合微孔膜的制备方法。以相转化法制备的PVDF膜为基膜，通过恒压过滤将多壁碳纳米管（MWCNTs）沉积到PVDF基膜表面，再经聚二甲基硅氧烷（PDMS）溶液修饰，可制得接触角达162°、滚动角约10°的PVDF复合微孔膜。用原子力显微镜和扫描电镜对膜表面进行结构分析，并测试了膜的接触角、气通量和机械强度等性能，考察了MWCNTs及PDMS浓度对膜结构和性能的影响。研究表明，CNTs在具有微米级粗糙度的基膜上强化了纳米结构，提高了膜的粗糙度，PDMS降低了膜的表面能，二者协同作用使复合膜的接触角大幅提高，滚动角显著下降。与高度疏水的PVDF基膜相比，PVDF复合膜的疏水性大幅提高，断裂伸长率加倍，在模拟海水真空膜蒸馏过程中，保持了较高的传质通量和截留率，具有更好的操作稳定性和抗污染性能。

关键词: 膜, 制备, 聚偏氟乙烯, 过滤, 碳纳米管, 超疏水

Abstract: A novel method is reported to fabricate superhydrophobic polyvinylidene fluoride(PVDF) microporous composite membrane. PVDF microporous membrane prepared by phase inversion was used as the support membrane. Functional multi-walled carbon nanotubes (MWCNTs) were deposited on the support membrane by constant pressure filtration, then the prepared membrane was coated with polydimethylsiloxane(PDMS). The obtained composite membrane exhibited super-hydrophobic property with the water contact angle of 162° and the sliding angle of about 10°. The morphology, contact angle, N₂ flux and the tensile strength of the membranes were tested. The effect of the concentration of MWCNTs and PDMS in the coating solution on the structure and properties of the membranes were also investigated. The results showed that the addition of MWCNTs strengthened the nanostructures of the membrane surface and improved the roughness of the membrane simultaneously. The PDMS coating reduced the surface energy of the membrane. Their synergistic effect increased the contact angle and decreased sliding angle of the composite membranes significantly. Compared with the hydrophobic PVDF support membrane, the hydrophobicity of the composite membrane was better, and the elongation at breaking was doubled. In the vacuum membrane distillation of the simulated seawater, the operational stability and antifouling property of the composite PVDF membrane prepared in this study were greater than those of the hydrophobic PVDF support membrane. And the merits of high permeation flux and rejection coefficient were maintained.

Key words: membranes, preparation, polyvinylidene fluoride, filtration, carbon nanotubes, superhydrophobic

中图分类号:

王志英, 韩承志, 于泳波, 邓会宁, 李春利. 超疏水聚偏氟乙烯复合微孔膜的制备及性能[J]. 化工进展, 2018, 37(02): 673-680.

WANG Zhiying, HAN Chengzhi, YU Yongbo, DENG Huining, LI Chunli. Preparation and properties of superhydrophobic PVDF microporous composite membrane[J]. Chemical Industry and Engineering Progress, 2018, 37(02): 673-680.

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超疏水聚偏氟乙烯复合微孔膜的制备及性能

Preparation and properties of superhydrophobic PVDF microporous composite membrane

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