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Effects of Porous Substrates and Technical Conditions on Microstructures of Plasma-Induced Grafted Membranes

Published on Jan 1, 2005in Filter & Separator
Yang Mei (Sichuan University)
Abstract
A series of environmental responsive gating membranes were prepared by grafting methacrylic acid(MAA) onto two organic substrates,including porous polyvinylidene fluoride(PVDF) membranes and nylon(N6) membranes,and onto inorganic substrate porous anodic aluminum(PAA) membranes,with plasma-induced graft polymerization.Effects of porous membrane substrates and grafted technical conditions on microstructures of grafted gating membranes have been systematically studied.Times of repeated freezing and thawing for degassing,porous membrane substrates and plasma-discharge power(PDP) have significant effects on the grafting in this study.For PVDF membranes,the more times of repeated freezing and thawing for degassing lasted,the higher grafting yields of PVDF membranes could be achieved.With substrates varying,different grafting yields were obtained under the same technical conditions.The grafting yield of N6 membrane was higher than PVDF membrane,and PAA membrane was the lowest one.Because of their differences in microstructures,when the grafting yield of PVDF membranes was closed to that of N6 membranes,the grafted layer existed both in the pores and on the surface of PVDF membranes,while it only existed in the surface layer of N6 membranes.PDP has significant effect on PAA membranes due to the corrosion by plasma.The PAA substrate lost weight when PDP was larger than 50W.
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