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研究了不同聚合物分子量对浸没沉淀相转化法制备聚偏氟乙烯(PVDF)微滤膜的形态结构、成膜厚度、过滤性能、亲水性、孔隙率、临界通量以及污染性能的影响。试验结果表明,随聚合物分子量的增加,铸膜液黏度越大,越利于膜亚层形成指状连通结构,孔隙率逐渐增大,但成膜厚度及纯水通量逐渐降低。聚合物分子量在一定程度上会影响膜亲水性及膜抗污染性能,即在一定范围内膜的亲水性能及抗污染性能会随聚合物分子量呈正相关性,但超出一定范围则呈负相关性,而临界通量值则随分子量的提高呈现出略微减少的趋势,但相差不大。
The effects of molecular weight of different polymers on morphology, film thickness, filtration, hydrophilicity, porosity, critical flux and pollution performance of polyvinylidene fluoride (PVDF) microfiltration membrane prepared by immersion precipitation phase inversion were studied. The experimental results show that with the increase of polymer molecular weight, the greater the viscosity of the casting solution, the more favorable the formation of finger-like structures in the film sublayer, the porosity increases gradually, but the film thickness and pure water flux gradually decrease. To some extent, the molecular weight of the polymer will affect the membrane hydrophilicity and membrane anti-fouling performance. That is to say, the hydrophilicity and anti-fouling performance of the membrane are positively correlated with the molecular weight of the polymer within a certain range, but negative correlation While the critical flux value showed a slight decrease with the increase of molecular weight, but with little difference.