论文部分内容阅读
以聚醚砜(PES)为共混材料,采用湿法相转化法制备了PVDF/PES共混平板膜。研究表明,PVDF和PES为部分相容体系,同时添加聚乙烯吡咯烷酮与聚乙二醇时膜的性能最佳,优化后的共混条件为:PVDF/PES以18∶2的共混比在铸膜液中占20%(wt,下同),添加剂PEG-400与PVP-K30各占7%,溶剂N,N-二甲基乙酰胺占66%。此时制得的PVDF/PES共混平板膜的接触角为75.04°,水通量为450.4L·m2·h-1,截留率为78.4%。
Polyethersulfone (PES) was used as the blend material to prepare PVDF / PES blend membrane by wet phase transformation. The results show that PVDF and PES are partially compatible systems, and the best performance is obtained when polyvinylpyrrolidone and polyethylene glycol are added at the same time. The optimized blending conditions are as follows: the blend ratio of PVDF / PES is 18: 2 The liquid membrane accounted for 20% (wt, the same below), additives PEG-400 and PVP-K30 each accounted for 7%, solvent N, N-dimethylacetamide accounted for 66%. The contact angle of PVDF / PES blend membrane prepared at this time was 75.04 °, the water flux was 450.4L · m 2 · h-1, and the rejection rate was 78.4%.