The resulting compound (referred to herein as an anion-exchange monomer) has the following formula (II): ##STR2## where X has the above described definition and a terminal quaternary ammonium salt anion-exchange site has been created (NR3 R4 R5) where N is a nitrogen atom and R3, R4 and R5 are each independently hydrogen, straight-chain or branched alkyl from 1 to about 12 carbon atoms or stra