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通过紫外辐射引发原子转移自由基聚合的方法制备了接枝率不同的聚偏氟乙烯接枝甲基丙烯酸甲酯膜(PVDF-g-PMMA),通过对牛血清蛋白(BSA)的过滤来检验膜的抗污染性能。结果显示,随着膜的MMA接枝率增加,膜的亲水性增加,对BSA的静态吸附量减少。接枝率为23.5%的PVDF-g-PMMA膜的吸附量为PVDF膜吸附量的1/2。膜自身阻力Rm和浓差极化边界层阻力Rc的和占总过滤阻力的78%以上,是导致亲水性接枝膜的膜通量降低的主要因素。随着膜接枝率的增加,Rm和Rc逐渐减小,且整个膜过滤阻力逐渐减小。
Polyvinylidene fluoride (PVDF) grafted methyl methacrylate (PVDF-g-PMMA) with different grafting rates was prepared by UV-induced atom transfer radical polymerization. Filtration of bovine serum albumin (BSA) Film anti-pollution performance. The results showed that the hydrophilicity of the membrane increased with the increase of MMA grafting rate and the static adsorption to BSA decreased. The adsorption capacity of the PVDF-g-PMMA film with a grafting ratio of 23.5% was 1/2 that of the PVDF film. The sum of the self-resistance Rm of the membrane and the resistance Rc of the concentration-polarization boundary layer accounts for more than 78% of the total filtration resistance, which is the main factor leading to the decrease of membrane flux of the hydrophilic graft membrane. With the increase of membrane grafting rate, Rm and Rc gradually decreased, and the membrane filtration resistance gradually decreased.