Alkaline anion exchange membrane and preparation method thereof

An alkaline anion exchange membrane comprises a polystyrene or poly(styrene-ethylene- butylene) segmented copolymer main chain; and the phenyl containing part of the polystyrene or poly(styrene-ethylene- butylene) segmented copolymer main chain is bonded with a cation functional group or a long hydrophobic side chain through methylene; wherein the molecular weight of polystyrene is greater than 100000, and the molecular weight of the poly(styrene-ethylene- butylene) segmented copolymer is greater than 40000. Compared with the prior art, the membrane casting technology is easy, large area membranes can be produced massively, the prepared alkaline anion exchange membrane with a long hydrophobic side chain has a uniform, smooth, and compact surface; the conductivity can reach 80 S/cm, the requirements of fuel cells on the conductivity of the alkaline anion exchange membrane can be met; the membrane also has good mechanical properties, the breaking elongation rate can reach 500%, the chemical stability is good, the stability time is longer than 3000 hours in a high temperature alkaline environment, the thermal stability is good, and the glass-transition temperature is higher than 180 DEG C.