METHOD FOR SYNTHESIS OF THIN FILM COMPOSITE MEMBRANES

摘要

The present invention relates to improved methods for the preparation of thin film composite membranes by interfacial polymerization, preferably (organic) solvent resistant thin film composite membranes. More in particular the method of the present invention allows for the preparation of thin film composite membranes wherein a thin film is deposited on a porous crosslinked support. Said method comprises the one step solidification, impregnation and crosslinking of the porous support through phase inversion by immersion of the cast membrane polymer film in an (aqueous) solvent comprising a polyfunctional monomers.

主权项

1. A method for preparing a TFC membrane comprising a support, which comprises a cross-linked first polymer, and a top layer comprising a film of a second polymer, wherein said method comprises:
(i) casting a solution of said first polymer onto a suitable substrate; (ii) preparing a solidified and impregnated support by immersing said cast first polymer solution into a coagulation medium to solidify the first polymer, wherein said coagulation medium comprises polyfunctional monomers, such that during coagulation of said first polymer part of said polyfunctional monomers provides for the cross-linking of said first polymer, while another part of said polyfunctional monomers provides for the impregnation of said first polymer with a solution of polyfunctional monomers; and (iii) contacting the solidified and impregnated support of (ii) with a solvent that is immiscible with the coagulation medium and comprises polyfunctional monomers, whereby said polyfunctional monomers interfacially polymerise with at least one of the impregnated polyfunctional monomers of (ii) to form a thin film layer.