Patent ID: 6566456
Filing Date: 2003-05-20
Classification: C08F,C08G

Abstract:
A method for preparing a hybrid of polyvinylimidazole and silica, which comprises the following steps:a) copolymerizing vinylimidazole and a vinyl-containing alkoxysilane in an organic solvent to form a modified polyvinylimidazole having the following formula I; wherein m is an integer of 10-100, n is an integer of 5-30, R1 is C1-C6 alkylene, R2 is C1-C4 alkoxy, R3 and R4 independently are hydrogen, C1-C4 alkoxy or C1-C4 alkyl; and R5 is hydrogen or C1-C4 alkyl, wherein a free radical initiator is used to initiate said copolymerization reaction; and b) adding water and an organic solution of tri- or tetra-(C1-C4 alkoxy)silane into the resulting copolymerization mixture from step a) to perform hydrolysis and condensation reactions of the modified polyvinylimidazole (I) and the tri- or tetra-alkoxy silane to form a hybrid of polyvinylimidazole and silica comprising the following network structure wherein R6 is hydrogen or C1-C4 alkyl.