逆浸透用膜材料に関する研究 I : 酢酸セルロース(キャスト条件)

概要

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The effects of casting conditions of cellulose acetate membrane (Batch-47 type) on its reverse osmosis properties have been investigated by x-ray diffraction, electron microscopy, water vapor sorption and reverse osmosis performance. It was found that the membrane consisted of a thin dense layer and a porous substructure. The variation of diffusion coefficient of water calculated from the sorption data correspond to the change of water flux by a reverse osmosis. This indicates that as soon as a casting solvent is lost from the membrane surface, the dense layer is formed. The membrane annealed at about 75℃ showed a steep increase in salt rejection but a decrease in water flux. Some changes in compaction effect and membrane shrinkage were noted in the same temperature range as described above. X-ray diffraction and deuteration methods revealed no distinct increase in crystallinity upon annealing (40-80℃). This may be due to the pore size reduction on the surface accompanied by the shrinkage and also to the increase of degree crystallinity in the dense layer.
社団法人日本材料学会の論文
1975-06-15