The feed ratio of IILs/styrene, nitrogen content of copolymers
and the molar ratio of IILs/styrene in copolymers are summarized
in Table 1. Sample A, B and C were polymerized by [VBI]Br with
styrene, while Sample D, E and F were polymerized by [VMI]I with
styrene. The Nitrogen only existed in the imidazolium cation
groups, hence, the amount of imidazolium groups in the copolymers
could be reflected by the nitrogen content and controlled
by varying the feed ratio of IILs/styrene. It can be seen in Table 1
that the nitrogen content of copolymers decreased with the
decreasing amount of ionic liquids. All the copolymers and OH
form anion exchange membranes obtained in this work are soluble
in alcohols and DMF, insoluble in ethyl ether, chloroform and
tetrahydrofuran. Thus, the membranes could be prepared by solution
casting method mentioned in Section 2.4.