聚偏氟乙烯膜表面光接枝改性的研究

以N,N′-亚甲基双丙烯酰胺(MBA)为接枝单体、苯丙酮(BP)为光引发剂,采用紫外光照射的方法对疏水性聚偏氟乙烯(PVDF)微孔滤膜进行接枝改性,研究紫外接枝过程中溶剂、氧气、光照时间和单体浓度对PVDF膜光接枝的影响.结果表明:甲醇是溶剂的最佳选择,反应需要在无氧下进行,当单体浓度为0.1 mol.L-1、照射时间为45 m in时膜光接枝效果最佳.采用全反射红外光谱(ATR-IR)、表面水接触角分析膜的表面性质及变化.结果表明,MBA接枝到膜的表面,明显提高了膜的亲水性.

Studies on polyvinylidene fluoride membrane by surface photografting modification

In the paper,polyvinylidene fluoride(PVDF) membranes were photografted with the functional monomer N,N′-methylenebis(acrylamide)(MBA) using benzophenone(BP) as photoinitiator in methanol.The influence of solvent,oxygen,irradiate time and concentration of MBA to the photografting were studied.It was found the best solvent was methanol and the reaction condition must be anaerobic,the grafting degree went to a maximum when the irradiate time was 45 min and the concentration of MBA was 0.1 mol·L-1.ATR-IR spectroscopy and surface contact angle of water were applied to study the photografted membrane's surface properties.ATR-IR analysis identified the grafting of MBA to the PVDF membrane.Reduction of the contact angle of grafted PVDF membrane against water suggested the membrane surface became hydrophilic after photografting.