Preparation of an anion-exchange membrane by the animation of chlorinated polypropylene and polyethyleneimine at a low temperature and its ion-exchange property

An anion-exchange membrane was prepared by the amination of chlorinated polypropylene and polyethyleneimine at a low temperature and was investigated with respect to not only its physical properties but also its electrochemical properties. The degrees of animation were 50.16, 53.76, 57.11, and 65.29% at 30, 40, 50, and 55°C, respectively. The base polymer membrane had no water uptake, whereas that of the aminated polymer membrane was 0.254, 0.296, 0.298, and 0.319 g of H₂O/g of dry membrane, respectively, with increasing amination. The prepared membranes pos- sessed an ion-exchange capacity in the range of 1.257-2.000 mequiv/g of dry membrane and a fixed ion concentration in the range of 4.492-6.261 mequiv/g of H₂O. The ionic conductivity of the aminated polymer membrane was highest when the water uptake was highest. Those of the prepared membrane were in the range of 0.89 × 10^-2 to 1.36 × 10^-2 S/cm.