Abstract
An attempt was made to elucidate the mechanism of membrane formation and structure control. Ethylene-vinyl alcohol copolymer (EVAL) membranes were prepared by phase inversion from the DMSO solvent into nonsolvent coagulation baths varying in the nature of nonsolvent. The relationship between the bimolecular interaction, the relative diffusion rate and membrane formation is discussed according to two-step mechanism model. It shows that factors affecting membrane properties are the nature of the nonsolvent and the coagulation process. The influence of these factors was investigated and interpreted in terms of the morphological appearance of the membranes as observed by scanning electron microscopy. This analysis provides a better understanding of the membrane formation techniques.
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