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中文摘要：
根据铸膜液粘度、凝胶点温度及相转化动力学行为,结合SEM和AFM技术及泡点压力、亲水接触角等检测手段,考察了PVDF/DMAc体系中,共混添加PVA、PMMA、PVP及其组合对相转化进程及膜结构参数和性能等的影响。结果显示,PVA和PM-MA共混PVDF铸膜液的粘度和凝胶点升高,导致延迟分相并减缓了相分离及固化速度,膜内部大孔和海绵结构相互贯穿,膜亲水性较好。PVP和PMMA共混PVDF体系发生瞬时分相,液-液分相与液-固分相同时并存,膜内部大孔通透,支撑层致密,分离性能优良。PMMA能有效改善三元共混膜表面的粗糙行为。
英文摘要：
Effects of adding PVA, PMMA, PVP and their combinations in PVDF/DMAc system on phase inver- sion process and membrane structure parameters and performance were investigated according to the casting so- lution viscosity, gel point temperature and dynamic behavior of phase transformation and combined with SEM and AFM techniques, bubble point pressure and hydrophilie contact angle etc means. The results showed that the viscosity and gel point of the casting solution which blended PVA, PMMA and PVDF separately increased, resulting in delayed demixing and slowing down the phase separation and curing speed. The macropores and sponge-like structure in membrane internal were interfingering and hydrophilic of the films were better. The PVP and PMMA blending PVDF system produced instantaneous demixing, and liquid-liquid demixing and liq- uid-solid demixing coexisted, the macropores in membrane internal were transparent and the support layers were dense, showing excellent separation performance. PMMA can effectively improve the surface roughness of the ternary blend films.
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