| 摘要 |
Disclosed are membranes formed from self-assembling diblock copolymers of the formula (I):;;wherein R1-R4, n, and m are as described herein, which find use in preparing porous membranes. Embodiments of the membranes contain the diblock copolymer that self-assembles into a cylindrical morphology. Also disclosed is a method of preparing such a membrane which involves hybrid casting a polymer solution containing the diblock copolymer to obtain a thin film, followed by evaporation of some of the solvent from the thin film, and coagulating the resulting this film in a bath containing a nonsolvent or poor solvent for the diblock copolymer. |
| 主权项 |
1. A method of preparing a porous membrane comprising a diblock copolymer of the formula (I):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;the method comprising:
(i) dissolving the diblock copolymer in a solvent system to obtain a polymer solution; (ii) coating the polymer solution onto a substrate; (iii) evaporating at least a portion of a solvent from the coating obtained in (ii); (iv) immersing the coating from (iii) into a coagulation bath; and (v) washing the porous membrane obtained in (iv). |
