A certain amount of copolymers were dissolved in N,NDimethylformamide
(DMF) respectively to form a 5e10 wt% solution.
The solution was cast onto flat glass plates at room temperature,
dried in a vacuum oven at 80 C for 8 h after the deaeration
process under vacuum continuing for 2 h to prepare membrane,
respectively. The membranes that peeled off from the flat glass
plates were kept in 1 mol L1 NaOH solution for 48 h. Finally, the
membranes were washed thoroughly by deionized water to
remove the residual NaOH and stored in deionizedwater for further
use. The thickness of the dry anion exchange membranes were
controlled between 30 and 60 mm.