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首页> 外文期刊>Journal of Applied Polymer Science >Porous poly(vinylidene fluoride) membrane with highly hydrophobic surface
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Porous poly(vinylidene fluoride) membrane with highly hydrophobic surface

机译：具有高度疏水性的多孔聚偏二氟乙烯膜

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摘要

The preparation of very hydrophobic poly(vinylidene fluoride) (PVDF) membranes was explored by using two methods. The first one was the modified phase inversion method using a water/N,N-dimethylacetamide (DMAc) mixture instead of pure water as a soft precipitation bath. The second method was a precipitation-bath free method, that is, the PVDF/DMAc casting solution underwent gelation in the open air instead of being immersed into a precipitation bath. The morphology of the surface and cross section of the membranes was investigated by using scanning electron microscopy (SEM). It was found that the membranes exhibited certain micro- and nanoscale hierarchical roughness on the surface, which brought about an enhanced hydrophobicity of the membrane. The contact angle (CA) of the samples obtained by the second method was as high as 150 degrees with water. The conventional phase inversion method preparing PVDF porous membrane using pure water as precipitation bath usually results in an asymmetric membrane with a dense skin layer having a CA close to that of a smooth PVDF surface. The modified approach avoided the formation of a skin-layer and resulted in a porous and highly hydrophobic surface of PVDF. (c) 2005 Wiley Periodicals, Inc.
机译：使用两种方法探索了非常疏水​​的聚偏二氟乙烯（PVDF）膜的制备。第一种方法是使用水/ N，N-二甲基乙酰胺（DMAc）混合物代替纯水作为软沉淀浴的改进相转化方法。第二种方法是无沉淀浴法，也就是说，PVDF / DMAc流延溶液在露天条件下发生凝胶化，而不是浸入沉淀浴中。通过使用扫描电子显微镜（SEM）研究膜的表面和横截面的形态。已经发现，膜在表面上表现出一定的微米和纳米级的分级粗糙度，这带来了膜的增强的疏水性。通过第二种方法获得的样品与水的接触角（CA）高达150度。使用纯水作为沉淀浴制备PVDF多孔膜的常规相转化方法通常导致具有致密表皮层的不对称膜，该表皮层的CA接近于光滑PVDF表面的CA。改进的方法避免了表皮层的形成，并导致了PVDF的多孔且高度疏水的表面。 （c）2005年Wiley Periodicals，Inc.

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