小分子醇对PES/CDA膜结构和性能的影响

Effect of small molecular alcohol on structure and properties of PES/CDA membranes

以聚醚砜(PES)和二醋酸纤维素(CDA)为原料,二甲基乙酰胺(DMAc)为溶剂,用浸没沉淀相转化法制备出PES/CDA共混平板膜。研究铸膜液中添加的丙三醇质量分数和醇的种类对PES/CDA共混平板膜结构和性能的影响,表征了膜的微观形貌,测试了膜的纯水通量、水接触角、孔径等性能。结果表明:丙三醇作为添加剂时,质量分数为6.0%时综合性能最好,此时膜的平均孔径为0.2104μm,最大孔径为0.2230μm,纯水通量为134.51 L/(m^2·h),水接触角为79.61°;质量分数相同时,添加乙二醇所得膜的纯水通量最大,添加异丙醇所得膜的水接触角最小。

The PES/CDA blend flat membranes were prepared with immersion precipitation phase inversion method by using polyethersulfone(PES)and cellulose diacetate(CDA)as raw materials and dimethylacetamide(DMAc)as the solvent.The effects of mass fraction of glycerin added in the casting solution and the type of alcohol on the structure and properties of PES/CDA blended flat membranes were investigated.The morphology of the membranes was characterized and the pure water flux,contact angle and pore size of the membranes were tested.The results showed that when 6.0 wt%glycerolwas added,the membrane could get the best comprehensive performance with the mean pore size of 0.2104μm,maximum pore size of 0.2230μm,pure water flux of 134.51 L/(m^2·h)and the water contact angle of 79.61°.With the same mass fraction,the pure water flux was found to be largest by using ethylene glycol as an additive,while the use of isopropanol as an additive demonstrated the smallest water contact angle.