プラズマ重合ピリジン薄膜の逆浸透特性とその初期変化

概要

論文の詳細を見る
A glow discharge of low-pressure pyridine vapor was applied to form a thin film of plasma-polymerized pyridine onto the surface of a porous membrane filter. The resulting composite membrane exhibited reverse osmosis characteristic for a dilute salt solution in which either degree of salt rejection and water permeability increased during the initial time of operation. Both degree of salt rejection and water permeability much more increased than in the neutral medium when the membrane was operated in acidic or alkaline salt solution. Further the change of reverse osmosis characteristic in acidic or alkaline medium was irreversible and at the same time the infrared spectroscopy found no change of chemical structure of the membrane after the treatment in acidic and alkaline solutions. Therefore a physical change such as enhanced extraction of smaller molecules involved in the plasma polymer to the acidic and alkaline media was thought as a reason for the change of reverse osmosis characteristic. Determinations of molecular weight distributions of the extract and the whole polymer supported the physical change. A hypothesis was therefore made that extraction of smaller molecules during the initial time of operation produced more micropores in the membrane having suitable pore size for reverse osmosis and that the extraction was significantly enhanced in acidic and alkaline salt solutions.
公益社団法人日本薬学会の論文
1983-07-25