Patent ID: 9604181
Date: 2017-03-28
CPC Classifications: B01D,C08G,C08J

Claim:
1. A method of preparing a porous membrane comprising a block copolymer of the formula (I) or (II): wherein: R R one of R n and m are independently about 10 to about 2000; x is 0.1 to n and y is 0.1 to m; wherein the volume fraction of the monomeric unit bearing R wherein the porous membrane has cylindrical morphology; the method comprising: (i) dissolving the block copolymer in a solvent system to obtain a polymer solution; (ii) spray coating the polymer solution onto a substrate; (iii) annealing the coating obtained in (ii) in a vapor comprising a solvent or a mixture of solvents to obtain a self-assembled structure; and optionally (iv) annealing or soaking the self-assembled structure obtained in (iii) in a solvent or mixture of solvents to obtain a porous membrane.