MEMBRANE COMPRISING SELF-ASSEMBLED BLOCK COPOLYMER AND PROCESS FOR PRODUCING THE SAME BY HYBRID CASTING (IB)

摘要

The present invention uses the ability of the block copolymers havingthermodynamicallyincompatible blocks to undergo phase separation and self-assemble, therebycreatingnanoporous membranes having uniform porosity. An asymmetric membrane comprisesafirst layer comprising a diblock copolymer and ordered pores in a cylindricalmorphologycontinuously extending to a second layer comprise the diblock copolymer in anetwork ofporous structure in which micro and macro channels are connected to provide atortuouspath for fluid flow, of the formula (I):(see formula I),wherein:R1 is a C1-C22 alkyl group optionally substituted, R2 to R4 is an aryl groupor aheteroaryl group, optionally substituted. It is manufactured by dissolving thediblockcopolymer in a solvent system to obtain a polymer solution; coating thepolymer solutiononto a substrate; evaporating a solvent from the coating obtained; immersingthe coatinginto a coagulation bath; and washing the porous membrane .