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首页> 外文期刊>Journal of Applied Polymer Science >Influence of Residence Time on Performances of PVDF Membranes Prepared via Free Radical Polymerization
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Influence of Residence Time on Performances of PVDF Membranes Prepared via Free Radical Polymerization

机译：停留时间对自由基聚合制备PVDF膜性能的影响

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摘要

Poly(vinylidene fluoride) (PVDF) membranes were prepared with various residence times using water-ethanol (50: 50, mass ratio) and pure ethanol coagulants as first coagulant, respectively. The physical properties of PVDF solution after free radical polymerization were investigated by dynamic light scattering (DLS), scanning electron microscopy (SEM), viscosity, precipitation kinetics, and surface tension. Resultant PVDF membranes were characterized by SEM, contact angle, mechanical properties, and filtration properties. The results showed that the longer residence time in the first coagulant contributed to the filtration properties improvement. Contact angles of the top-surfaces and bottom-surfaces of membranes decreased as residence time increasing in the first coagulant, and the top-surface showed better hydrophilicity than that of the bottom-surface. The pore size distributions of PVDF membranes showed that the dominating demixing process of the casting solution in water-ethanol coagulant was 5 s, and in that of ethanol was 10-15 s. Additionally, the short-time delay demixing process in water-ethanol first coagulant resulted in a thin dense layer near the top surface, and the longer time delay demixing process in that of ethanol contributed to the shift of the inter-globules to the cellular morphology in the case of the residence time increasing.
机译：分别使用水-乙醇（质量比为50:50）和纯乙醇凝结剂作为第一凝结剂，以不同的停留时间制备聚偏二氟乙烯（PVDF）膜。通过动态光散射（DLS），扫描电子显微镜（SEM），粘度，沉淀动力学和表面张力研究了自由基聚合后PVDF溶液的物理性质。通过SEM，接触角，机械性能和过滤性能表征所得的PVDF膜。结果表明，在第一凝结剂中停留时间更长有助于过滤性能的提高。膜的顶表面和底表面的接触角随着在第一凝结剂中的停留时间的增加而减小，并且顶表面显示出比底表面更好的亲水性。 PVDF膜的孔径分布表明，浇铸溶液在水-乙醇凝结剂中的主要混合过程为5 s，在乙醇中为10-15 s。此外，在水-乙醇第一混凝剂中的短时间延迟混合过程在顶表面附近产生了一个薄的致密层，而在乙醇中的较长时间延迟混合过程导致了小球间向细胞形态的迁移。在停留时间增加的情况下。

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