PVDF-g-PNIPAAm温敏抗污染膜的制备及性能研究

通过自由基共聚将聚(N-异丙基丙烯酰胺)(PNIPAAm)接枝到了碱处理聚偏氟乙烯(PVDF)粉末上,合成接枝共聚物PVDF-g-PNIPAAm。以此为原材料通过相转化法制备温敏抗污染分离膜。通过调控反应时间,达到不同的PNIPAAm接枝率,研究了不同接枝率对膜结构及性能的影响。结果表明,随着反应时间的延长,PNIPAAm的接枝率逐渐增加。成膜过程中发挥致孔作用明显致使膜表面的微孔数目逐渐增加。此外,PNIPAAm的接枝率越高膜的亲水性越强,且温敏性能提高。由于室温下PNIPAAm的亲水性,膜表面易形成水化层,从而提高改性膜的抗蛋白质污染性能。

Research on preparation and performance of temperature-sensitive antifouling poly(vinylidene fluoride)-graft-poly(N-isopropylacrylamide)

Alkali-treated poly(vinylidene flouride)(PVDF) grafted poly(N-isopropylacrylamide)(PNIPAAm) copolymer(PVDF-g-PNIPAAm) was synthesized via radical copolymerization and the different grafting ratio of PNIPAAm was obtained by regulating reaction time.The copolymer membranes were prepared by phase inversion method.The results indicated that the grafting ratio of PNIPAAm was enhanced with the increase of reaction time resulting in the formation of microporous structures on the membrane surface due to the pore-forming ability of the amphiphilic structure.In addition,the hydrophilicity and temperature-sensitivity were also improved with the increase of grafting ratio.At the room temperature,the copolymer membrane exhibited excellent protein-resistant property due to the hydrophilicty of PNIPAAm.