| 摘要 |
PURPOSE:To obtain a separating membrane having a high rate of permeation, and excellent selectivity by using the polysiloxaneamide obtd. by codensation polymn. of arom. dicarboxylic chlorides or dicarboxylate and specific silixane diamine. CONSTITUTION:The polysiloxaneamide obtd. by condensation polymn. of aromatic dicarboxylic chloride or dicarboxylate and the siloxane diamine expressed by the formula is used for the membrane material of a gas separating membrane. Terephthalic acid and isophthalic acid are preferable as the dicarboxylic acid, and in the formula n; 2-6 integer, m; 1-3 integer, R1, R2; alkyl groups. It is equally well to form the gas separating membrane by dissolving the polysiloxane amide in a solvent and coating the soln. in a porous membrane. PP, PVC, polystyrene, etc. are used as the material for the porous membrane. |
