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以熔融纺丝聚氯乙烯(PVC)中空纤维多孔膜为增强体,聚偏氟乙烯(PVDF)为成膜聚合物,聚乙烯吡咯烷酮(PVP)为添加剂,N,N-二甲基乙酰胺(DMAc)为溶剂,配置铸膜液,采用同心圆牵引-涂覆法制备了异质增强型PVDF中空纤维膜.制备过程中,采用预湿溶液对增强体基膜表面进行预处理,研究了预湿溶液组成及含量对异质增强型PVDF中空纤维膜结构与性能的影响.结果表明,未经预湿处理的异质增强型PVDF中空纤维膜具有较厚的致密界面层;预湿溶液可对基膜表面孔起到保护作用,使异质增强型PVDF中空纤维膜的界面层变薄或形成多孔界面层,有益于改善增强型PVDF中空纤维膜的通透性能;与二甲基乙酰胺(DMAc)水溶液相比,以乙醇水溶液为预湿溶液所得异质增强型PVDF中空纤维膜的性能较优;当预湿液中乙醇含量为60 wt%时,所得增强型PVDF中空纤维膜的渗透性能较优,拉伸强度可达8.61 MPa.
The melt spinning polyvinyl chloride (PVC) hollow fiber porous membrane as a reinforcement, polyvinylidene fluoride (PVDF) as a film-forming polymer, polyvinylpyrrolidone (PVP) as an additive, N, N- dimethylacetamide DMAc) was used as the solvent to prepare the casting solution, and the heterogeneous reinforced PVDF hollow fiber membrane was prepared by the concentric traction-coating method.In the preparation process, pre-wetting solution was used to pretreat the surface of the reinforcing base membrane, Wet solution composition and content on the structure and properties of heterogeneous reinforced PVDF hollow fiber membranes were studied.The results showed that heterogeneous reinforced PVDF hollow fiber membranes without pre-wet treatment had a thicker dense interface layer and pre-wet solution The base membrane surface pores play a protective role, the heterogeneous enhanced PVDF hollow fiber membrane interface layer thinning or the formation of porous interfacial layer conducive to improving the enhanced PVDF hollow fiber membrane permeability; and dimethylacetamide ( DMAc aqueous solution compared to aqueous ethanol solution as a pre-wet solution heterogeneous enhanced PVDF hollow fiber membrane performance is better; when the pre-wet ethanol concentration of 60 wt%, the resulting enhanced PVDF hollow fiber membrane permeability Excellent, tensile strength up to 8.61 MPa.