AbstractCrosslinked polymers based on the condensation of furfural withN‐vinylcarbazole and poly(N‐vinylcarbazole) were prepared. The effect of variation of furfural concentration on the condensation of furfural withN‐vinylcarbazole and its polymer was studied. The polymers were chemically modified into phosphonic acid cation exchange resins. The effects of variation of AlCl3, PCl3, and furfural amounts, reaction time, and rephosphorylation on the synthesis and capacities of cation exchange resins were also st
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