Abstract Polyvinylidene fluoride/polyamide6-grafting-tannic acid (PVDF/PA6-g-TA) hollow fiber membrane was prepared via the reaction between TA and PA6 on the membrane surface by thermally induced phase separation (TIPS) technique. The reaction mechanism and the distribution for TA on outer surface were explored. The change of surface morphology, hydrophilicity, chargeability, anti-fouling capacity and permeability was investigated after grafting. It was found that Schiff base reaction occurred between amino group and phenolic hydroxyl group, and thus avoided the falling of TA. The uniform distribution of TA on outer surface enhanced the hydrophilicity, rejection and anti-fouling capacity. Finally, the improvement of anti-fouling capacity and permeability was analyzed from chargeability for TA and bond water layer on repulsing the stackage of the pollutants. This work provides an efficient way to enhance the anti-fouling performance of membrane via TIPS.

中文翻译：

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鞣酸接枝制备中空纤维膜及其对微观结构、渗透性和防污性的影响

摘要 采用热诱导相分离(TIPS)技术，通过TA与PA6在膜表面反应制备聚偏二氟乙烯/聚酰胺6-接枝单宁酸(PVDF/PA6-g-TA)中空纤维膜。探索了反应机理和 TA 在外表面的分布。研究了接枝后表面形貌、亲水性、带电性、防污能力和渗透性的变化。发现氨基与酚羟基发生席夫碱反应，从而避免了TA的下降。TA在外表面的均匀分布增强了亲水性、截留和防污能力。最后，从TA和结合水层的带电能力对排斥污染物堆积的抗污能力和渗透率的提高进行了分析。这项工作为通过 TIPS 提高膜的防污性能提供了一种有效的方法。