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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。
Aiming at the molecular structure of polyethersulfone (PES) polymer membrane, a series of amphiphilic polymer PES, which has both polyethersulfone structural unit and hydrophilic segment of polyethylene glycol (PEG) co-PEG with PES was prepared by phase inversion method. The PES-co-PEG was characterized. The influence of reaction conditions on the polymerization products was investigated. The properties of PES-co-PEG film were tested. The results showed that the optimum reaction conditions were as follows: the polymerization was carried out at 230 ℃ for 8 h with the solvent of sulfolane at a relative molecular mass of 2 000; the pure water flux of the modified ultrafiltration membrane was 99.5 L / (m2. h) up to 277.7 L / (m2.h), the rejection rate is very small compared with pure PES membrane, both maintained above 90%; the flux of the membrane after washing with pure water basically returned to its original level . The blend modification succeeded in improving the hydrophilicity and anti-pollution performance of the PES ultrafiltration membrane.