“…For example, chloromethylated polymer has been converted to SH-containing material (96). Polystyrenesulfonic acid, converted to the acid chloride and treated with hydrazine, has yielded the hydrazide which, on treatment with p-benzoquinone, has yielded poly[ (2,5-dihydroxyphenylsulfonyl)styrene] (169). Chloromethylated polystyrene has been reacted with thionine, and with trimethylthionine (azure blue), as well as with anthraquinone and malachite green to yield redox polymers with capacities of about 0.4 meq/g.…”