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Abstract
Ethylene-vinyl alcohol copolymer (EVA) and ethylene-vinyl alcohol-acrylic acid terpolymer (EVA-AA) ultrathin membranes were prepared by spreading the polymer solutions on a water surface. The surfaces of the polymers were characterized by ζ-potential and ESCA measurements. The EVA membrane has nearly the same ζ-potential at both surfaces, that is, the air side and the water side surface. The results of the ESCA measurements demonstrated that the EVA membrane had more OH groups at the water side surface than at the air side surface. The EVA-AA membrane from DMSO solution had a higher ζ-potential on the water side surface than on the air side surface. However, the EVA-AA membrane from DMAc solution had the same ζ-potential on both surfaces. The ESCA measurement showed that EVA-AA membrane from DMSO solution had more than twice the amount of −COOH groups on the water side surface compared with the air side surface. On the other hand, in the membrane from DMAc solution the amount of COOH groups was observed to be the same at both sides.
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