MEMBRANE COMPRISING SELF-ASSEMBLED BLOCK COPOLYMER AND PROCESS FOR PRODUCING THE SAME BY SPIN COATING (IIa)

摘要

Disclosed are membranes formed from self-assembling block copolymers, for example, diblock copolymers of the formula (I):;wherein R1-R4, n, and m are as described herein, which find use in preparing nanoporous membranes. Embodiments of the membranes contain a block copolymer that self-assembles into a cylindrical morphology. Also disclosed is a method of preparing such membrane which involves spin coating a polymer solution containing the block copolymer to obtain a thin film, followed by annealing the thin film in a solvent vapor and/or soaking in a solvent or mixture of solvents to form a nanoporous membrane.

主权项

1. A method of preparing a porous membrane comprising a block copolymer of the formula (I) or (II):wherein:
R1 is a C1-C22 alkyl group optionally substituted with a substituent selected from halo, alkoxy, alkylcarbonyl, alkoxycarbonyl, amido, and nitro, or a C3-C11 cycloalkyl group, optionally substituted with a substituent selected from alkyl, halo, alkoxy, alkylcarbonyl, alkoxycarbonyl, amido, and nitro; R2 is a C6-C20 aryl group or a heteroaryl group, optionally substituted with a substituent selected from hydroxy, amino, halo, alkoxy, alkylcarbonyl, alkoxycarbonyl, amido, and nitro; one of R3 and R4 is a C6-C14 aryl group, optionally substituted with a substituent selected from hydroxy, halo, amino, and nitro, and the other of R3 and R4 is a C1-C22 alkoxy group, optionally substituted with a substituent selected from carboxy, amino, mercapto, alkynyl, alkenyl, halo, azido, and heterocyclyl; and n and m are independently about 10 to about 2000; 0 (i) dissolving the block copolymer in a solvent system to obtain a polymer solution; (ii) spin coating the polymer solution onto a substrate; and (iii) annealing the coating obtained in (ii) to obtain a self-assembled structure or a porous membrane.