| 摘要 |
Polymeric porous membranes comprising aliphatic polyamide membrane matrices having both relatively non-crystalline and relatively crystalline portions are described. The method of preparing the porous membranes includes dissolution of an aliphatic thermoplastic polyamide (having crystalline and non-crystalline portions) into an acidic hydrolytic solvent such that the crystalline portions form a colloidal dispersion which is further formed into a film. The non-crystalline portions are precipitated in the film to form a porous membrane matrix which is reacted with an acid halide of basicity above one to provide acid radicals within the membrane. The acid halide may be derived from an aromatic carboxylic acid or an aromatic derivative of a chlorosilane. The substituted aliphatic polyamide porous membranes lend themselves to the preparation of chemical derivatives of the membrane which are not readily available by aqueous synthesis and to increased density of derivatives which otherwise may be prepared in water. |
