两亲性聚合物的合成及其共混改性聚醚砜超滤膜的研究

SYNTHESIS OF AMPHIPHILIC COPOLYMERS AND THEIR APPLICATION IN MODIFICATION OF POLYETHERSULFONE ULTRAFILTRATION MEMBRANES

针对聚醚砜(PES)高分子膜材料的分子结构特点进行分子设计,合成了一系列既具有聚醚砜结构单元又有聚乙二醇(PEG)亲水链段的两亲性聚合物PES-co-PEG,与PES共混用相转化法制备超滤膜,对PES-co-PEG进行了表征,考察了反应条件对聚合产物的影响,测试了PES-co-PEG膜的性能。结果表明,使用相对分子质量为2 000的PEG、以环丁砜做溶剂、在230℃下聚合8 h以上反应效果为佳;共混改性的超滤膜纯水通量由99.5 L/(m2.h)最高上升到277.7 L/(m2.h),截留率与纯PES膜相比差别很小,均保持在90%以上;经过纯水清洗后的共混膜的通量基本恢复到原来水平。共混改性成功改善了PES超滤膜的亲水性和抗污染性能。

Molecular design was conducted according the structural characteristics of polyether sulfone（PES） polymer membrane and synthesized a series amphiphilic polymer PES-co-PEG which had both polyether sulfone structural units and polyethylene glycol（PEG） hydrophilic segment,PES was mixed with PES-co-PEG for preparing the ultrafiltration membrane using phase inversion,the PES-co-PEG was characterized,and the influence of reaction conditions on the polymerization products was investigated and PES-co-PEG membrane performance was tested.The results showed that the using of relative molecular mass PEG2000,taking sulfolane as solvent,the reaction effect was better when the polymerization was at 230 ℃ for more than 8 h;pure water flux of blend modified ultrafiltration membrane was from 99.5 L/（m2·h） to 277.7 L/（m2·h）,The retention rate difference was very small compared to the pure PES,which were maintained at above 90%;the pure water flux of the blend membranes basically returned to its original level after cleaning.Blend modified successfully improved the hydrophilic and fouling-resistance performance of PES ultrafiltration membranes.