Abstract The use of amphiphilic copolymer Pluronic F127 as an additive has shown effectiveness in fabricating polyethersulfone (PES) membranes with excellent antifouling properties due to its roles in enhancing pore structure and surface hydrophilicity. However, F127 was found to be unstable in polyvinylidene fluoride (PVDF) membranes as its hydrophilic modifying function was deactivated over time. In present work, we developed a novel approach to immobilize F127 in PVDF hollow fiber membranes using polytetrafluoroethylene (PTFE) particles as a binding agent in the combined nonsolvent and thermally induced phase separation (N-TIPS) method. The results suggest that the hydrophobic segment of F127 could adsorb firmly onto PTFE with the hydrophilic segments protruding outwards. The dual-functions of F127 were observed in pore formation and surface hydrophilization for PVDF membranes. The water contact angle of PVDF/PTFE/F127 membranes decreased from 102 ± 4° to 76 ± 3° compared with membranes without additives. The resultant membranes possess a pure water permeability (PWP) of 869 ± 39 L m−2h−1bar−1 with a mean pore size of 0.09 ± 0.01 μm and an outstanding tensile strength of 7.0 ± 0.3 MPa, suggesting the potential of N-TIPS method for tuning the membrane pore structure and hydrophilicity by using multifunctional additives.

中文翻译：

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通过非溶剂-热诱导相分离方法在具有增强亲水性的 PVDF 中空纤维膜中进行聚四氟乙烯辅助固定化

摘要 使用两亲共聚物 Pluronic F127 作为添加剂，由于其在增强孔结构和表面亲水性方面的作用，在制造具有优异防污性能的聚醚砜 (PES) 膜方面已显示出有效性。然而，发现 F127 在聚偏二氟乙烯 (PVDF) 膜中不稳定，因为其亲水改性功能会随着时间的推移而失活。在目前的工作中，我们开发了一种将 F127 固定在 PVDF 中空纤维膜中的新方法，该方法使用聚四氟乙烯 (PTFE) 颗粒作为结合非溶剂和热诱导相分离 (N-TIPS) 方法的粘合剂。结果表明，F127 的疏水链段可以牢固地吸附在 PTFE 上，亲水链段向外突出。在 PVDF 膜的孔形成和表面亲水化中观察到 F127 的双重功能。与不含添加剂的膜相比，PVDF/PTFE/F127 膜的水接触角从 102±4° 降低到 76±3°。所得膜的纯水渗透率 (PWP) 为 869 ± 39 L m-2h-1bar-1，平均孔径为 0.09 ± 0.01 μm，拉伸强度为 7.0 ± 0.3 MPa，表明 N-使用多功能添加剂调节膜孔结构和亲水性的 TIPS 方法。