Preparation of bipolar membranes (I)

The bipolar membranes were prepared by charged material of polysulfone as a base. The bipolar membranes were composed of a solvent-resistant anion exc hange layer with a crosslinking matrix prepared by the reaction of chlorome thylated polysulfone in DMF with diamine, an interfacial layer made from ch loromethylated polysulfone solution in DMF containing cation exchange resin and amine, and a cation exchange layer made from sulfonated polysulfone di spersing cation resin powder. The prepared bipolar membrane can exhibit low er voltage drop over 100 mA/cm(2). The critical requirement for producing b ipolar membranes of low potential drop is the creation of a thin interfacia l region with a low electrical resistance and a suitable chemical structure , which act to catalyze water splitting. (C) 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1658-1663, 2001.