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A new class of poly(aryl ether-1,2,4-triazoles) has been prepared by heterocyclic-activated displacement polymerization. In these reactions, the aryl ether linkages are generated in the polymer forming reaction. It was demonstrated that the 1,2,4-triazole heterocyclic unit is sufficiently electron-withdrawing to activate, albeit weakly, aryl-fluorides toward nucleophilic displacement giving new thermally stable polymers that could be processed from organic solvents as well as from the melt.