PVC/PES-g-PEGMA共混膜的制备及其耐污染性能

首先将聚乙二醇单甲基甲醚酯(PEGMA)接枝到聚醚砜(PES)上得到PES-g-PEGMA,然后利用溶液共混的方法,将聚氯乙烯(PVC)与PES-g-PEGMA共混,通过溶剂-非溶剂扩散诱导相分离法(NIPS)制备PVC/PES-g-PEGMA共混膜。在此基础上对PVC/PES-g-PEGMA共混膜的断面和表面微观结构、水通量、 截留率、机械性能及耐污染等性能进行测试,并采用接触角,含水率(EWC),X 射线光电子能谱仪(XPS) 来表征PES-g-PEGMA 的质量百分含量对 PVC/PES-g-PEGMA 共混膜亲水性的影响。结果表明,PVC/PES-g-PEGMA共混膜水通量,亲水性较纯PVC有很大程度的提高。耐污染性实验表明,随着PES-g-PEGMA的增加,耐污染性逐渐增强。实验结果同时也表明,该共混体系最佳共混比为7:3。

Preparation and antifouling property of PVC/PES-g-PEGMA blend membranes

We attempted to graft poly (ether glycol) methyl ether methacrylate (PEGMA) onto polyethersulfone (PES) to synthesize PES-g-PEGMA, and then PES-g-PEGMA was blended with poly (vinyl chloride)(PVC) using solvent-non solvent diffusion induced phase separation method(NIPS)to fabricate blend membranes. Effects of PES-g-PEGMA contents in the casting solution of PVC on the microstructure of cross-section and surface, water permeability, retention, mechanical strength and hydrophilicity of PVC/ PES-g-PEGMA blend membranes were investigated. The hydrophilicity of PVC/ PES-g-PEGMA membranes was characterized by contact angle, equilibrium water content (EWC) and X-ray photoelectron spectroscopy (XPS) analyses. The results show that PVC/ PES-g-PEGMA blend membranes can more efficiently improve the water permeability and hydrophilicity of PVC membranes. The results of antifouling experience state that with the increasing of PEGMA contents, blending system has higher resistance towards fouling. Meanwhile,the experimental results also show that the optimum blending ratio is 7:3 in this blending system.