Abstract This study focuses on the modification of commercial polyvinylidene fluoride (PVDF) membranes using surface-initiated atom transfer radical polymerization (SI-ATRP) method. Poly(N-isopropylacrylamide) (PNIPAAm) was grafted from PVDF surface and then PEGMA was grafted onto the PVDF-g-PNIPAAm membrane. The aim of the research was to prepare membranes that simultaneously have antifouling and self-cleaning properties. PNIPAAm (lower block) was grafted to give the membrane temperature sensitive property and PPEGMA (upper block) was used to improve hydrophilicity. Morphology, topography and chemical composition of the modified membranes were completely characterized. Antifouling and cleaning ability of modified membranes were investigated using synthetic oily water. Moreover, the role of PEGMA polymerization time on the membrane performance was examined. PNIPAAm-b-PPEGMA modified membrane achieved 64% decrease in fouling ratio compared to unmodified PVDF membrane at best condition. The flux recovery was 99.1% for modified membrane at this condition. Furthermore, the unmodified PVDF membrane showed 91.1% oil rejection; while the modified membrane could reject 98.2% oil molecules. The final flux of all modified membranes were higher than unmodified membrane. These results indicated that PNIPAAm-b-PPEGMA modified membranes have excellent fouling resistance and self-cleaning ability.

中文翻译：

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聚合物刷接枝聚偏氟乙烯超滤膜改善油水处理的防污自洁能力

摘要 本研究的重点是使用表面引发的原子转移自由基聚合 (SI-ATRP) 方法对商用聚偏二氟乙烯 (PVDF) 膜进行改性。从 PVDF 表面接枝聚（N-异丙基丙烯酰胺）（PNIPAAm），然后将 PEGMA 接枝到 PVDF-g-PNIPAAm 膜上。研究的目的是制备同时具有防污和自清洁性能的膜。接枝PNIPAAm（下部嵌段）以赋予膜温度敏感特性，并使用PPEGMA（上部嵌段）提高亲水性。完全表征了改性膜的形态、形貌和化学成分。使用合成油水研究了改性膜的防污和清洁能力。而且，研究了 PEGMA 聚合时间对膜性能的影响。在最佳条件下，PNIPAAm-b-PPEGMA 改性膜与未改性 PVDF 膜相比，污染率降低了 64%。在此条件下，改性膜的通量回收率为 99.1%。此外，未改性的 PVDF 膜显示出 91.1% 的油截留率；而改性膜可以拒绝98.2%的油分子。所有改性膜的最终通量均高于未改性膜。这些结果表明PNIPAAm-b-PPEGMA改性膜具有优异的抗污染性和自清洁能力。未改性的 PVDF 膜显示出 91.1% 的油截留率；而改性膜可以拒绝98.2%的油分子。所有改性膜的最终通量均高于未改性膜。这些结果表明PNIPAAm-b-PPEGMA改性膜具有优异的抗污染性和自清洁能力。未改性的 PVDF 膜显示出 91.1% 的油截留率；而改性膜可以拒绝98.2%的油分子。所有改性膜的最终通量均高于未改性膜。这些结果表明PNIPAAm-b-PPEGMA改性膜具有优异的抗污染性和自清洁能力。