In order to enhance the hydrophilicity of PTFE hollow fiber membrane, high concentration of polymer was needed during the modifying process, but this method resulted in severe pore blockage of hollow fiber membrane with reduced water flux. Herein, we resolve the above contradiction by using cross-linkable poly (vinylpyrrolidoneγ-methacryloxypropyltrimethoxysilane) (P (VP-KH570)) as hydrophilic polymer and calcium chloride as sacrificial template. The enhanced hydrophilicity and chemical washing resistance of PTFE hollow fiber membrane were achieved by the highly hydrophilic PVP segments and highly crosslinking density contributed by hydrolysis and condensation of the KH570 segments, respectively. The template is embedded in the polymer network formed in the membrane pores, and after template removal the previously occupied pores are released for water transport, thereby minimizing the loss of water flux. The high water flux (1477.14 ± 16.11 L/(m·h)), superhydrophilicity (the water contact angle = 0°) and hydrophilic stability proved that PTFE hollow fiber membranes are successfully modified by the sacrificial template method. This work provides a facile strategy for designing hydrophilic PTFE hollow fiber membranes for water treatment.

中文翻译：

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一种新型牺牲模板聚四氟乙烯（PTFE）中空纤维膜亲水改性方法

为了增强PTFE中空纤维膜的亲水性，在改性过程中需要使用高浓度的聚合物，但这种方法导致中空纤维膜的孔道堵塞严重，水通量降低。在此，我们通过使用可交联的聚(乙烯基吡咯烷酮γ-甲基丙烯酰氧基丙基三甲氧基硅烷)(P(VP-KH570))作为亲水性聚合物和氯化钙作为牺牲模板来解决上述矛盾。 PTFE中空纤维膜的亲水性和耐化学清洗性的增强分别是通过高亲水性PVP链段和KH570链段的水解和缩合带来的高交联密度来实现的。模板嵌入在膜孔中形成的聚合物网络中，去除模板后，先前占据的孔被释放以进行水传输，从而最大限度地减少水通量的损失。高水通量(1477.14±16.11 L/(m·h))、超亲水性(水接触角=0°)和亲水稳定性证明牺牲模板法成功对PTFE中空纤维膜进行改性。这项工作为设计用于水处理的亲水性 PTFE 中空纤维膜提供了一种简便的策略。