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考察了两亲性共聚物聚氧乙烯/聚氧丙烯/聚氧乙烯[PEO-PPO-PEO(F127)]共混聚偏氟乙烯(PVDF)铸膜液,在水相凝胶浴中的相转化动力学过程.结合衰减全反射傅立叶转变红外光谱(ATR-FTIR)、扫描电子显微镜(SEM)、原子力显微镜(AFM)等表征手段,分析了F127含量在PVDF膜表面的PEO富集率、膜微观形貌及结构参数的影响规律.以静态吸附量、过滤比通量衰减及膜污染阻力模型,评价了F127/PVDF共混膜对牛血清蛋白(BSA)的抗污染性能.结果表明随着F127添加量增大,相转化延迟分相行为增强,膜表面及内部孔径和孔隙率升高,表面粗糙度增大,膜面PEO富集率的增幅在F127含量达15%后趋于稳定.F127含量在15%~25%之间的共混膜有较高的渗透通量和BSA截留率,静态吸附量低,比通量衰减速度慢,不可逆污染指数低,堵孔阻力及滤饼层阻力分布系数小,表现了良好的抗污染性能.
The effects of amphiphilic copolymer poly (ethylene oxide) / polyoxypropylene / polyoxyethylene [PEO-PPO-PEO (F127)] mixed polyvinylidene fluoride (PVDF) The kinetics of the conversion of PEO was investigated by means of ATR-FTIR, scanning electron microscopy (SEM) and atomic force microscopy (AFM) Micro-topography and structure parameters of the F127 / PVDF blend membrane were investigated.The anti-fouling performance of F127 / PVDF blend membrane against BSA was evaluated by static adsorption capacity, filtration specific flux decay and membrane fouling resistance model.The results showed that The content of F127 increases, the delayed phase transition behavior increases, the surface and internal pore diameter and porosity increase, and the surface roughness increases. The enrichment rate of PEO tends to be stable after F127 content reaches 15%. The blend membrane with F127 content of 15% ~ 25% had higher permeate flux and BSA rejection, lower static adsorption capacity, slower specific flux decay rate, lower irreversible contamination index, plugging resistance and cake layer Resistance distribution coefficient is small, showing good anti-pollution performance.