Preparation of anion exchange membrane by amination of chlorinated polypropylene and ethylenediamine and its properties

An anion exchange membrane was prepared by amination of chlorinated polypropylene (CPP) and ethylenediamine (EDA) at a low temperature and was investigated with respect to not only its physical properties but also its electrochemical properties. The degrees of amination were 46.05, 47.07, 50.56, and 56.58% at 30, 40, 50, and 55°, respectively. The CPP membrane had no water uptake, whereas, that of the CPP-EDA membrane was 0.153, 0.243, 0.309, and 0.410 g of H₂O/g of dry membrane, respectively, with increasing amination. The CPP-EDA membranes possessed an ion exchange capacity in the range 0.557-1.498 mequiv/g of dry membrane and a fixed ion concentration in the range 4.198-5.114 mequiv/g of H₂O. The ionic conductivity of the CPP-EDA membrane was highest when the water uptake was highest. Those of the CPP-EDA membrane were in the range 0.475 × 10-2-0.999 × 10-2 S/cm.