摘要
提高疏水膜表面的疏水性是降低其应用过程中润湿风险的有效方法.为了便捷有效地调控膜结构从而提高膜的疏水性,采用非溶剂致相分离法,以水作为非溶剂添加剂,希望通过调节初生膜的预蒸发时间这一最便捷的手段,调控膜的结构及疏水性.结果表明,随着预蒸发时间的延长,铸膜液黏度增加,有利于膜表面凝胶化的形成,从而在膜表面构建出均一超疏水结构.当预蒸发时间达到120 s时,膜表面的水接触角达到151.2°,膜的气体渗透通量为40.9 mL/(m2·s·Pa),透水压力达到65.3 kPa.
Improving the hydrophobicity of hydrophobic membrane surface is an effective way to reduce the wetting risk during its application.In order to control the membrane structure conveniently and effectively and improve the hydrophobicity of the membrane,H2O was added to the dope solution as non-solvent additive by non-solvent induced phase separation method.The membrane structure and hydrophobicity have been controlled by adjusting the pre-evaporation time of primary membrane.The results showed that with the increase of pre-evaporation time,the viscosity of the dope solution increased,which was conducive to the formation of gelation on the surface of the membrane,thereby creating a uniform super-hydrophobic structure on the membrane surface.When the pre-evaporation time reached 120 s,the water contact angle of the membrane was 151.2°,the gas permeation flux of the membrane was 40.9 mL/(m2·s·Pa),and the LEP was 65.3 kPa.
作者
张仁伟
刘四华
汤超
厍景国
武春瑞
吕晓龙
ZHANG Renwei;LIU Sihua;TANG Chao;SHE Jingguo;WU Chunrui;LYU Xiaolong(State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China)
出处
《膜科学与技术》
CAS
CSCD
北大核心
2020年第3期7-13,21,共8页
Membrane Science and Technology
基金
国家自然科学面上基金项目(51578376)。
关键词
聚偏氟乙烯
疏水膜
非溶剂致相分离
预蒸发时间
非溶剂添加剂
polyvinylidene fluoride
hydrophobic membrane
non-solvent induced phase separation method
pre-evaporation time
non-solvent additive
