AbstractThe copolymerizations of 4(5)‐vinyl‐1,2,3‐triazole, 1‐p‐bromophenyl‐4‐vinyl‐1,2,3‐triazole and 2‐methyl‐5‐vinyltetrazole with styrene, methyl methacrylate and vinyl acetate have been examined and the corresponding copolymerization parametersr1,r2were evaluated. The reactivitiesQof these monomers are lower than that of styrene contrarily to other C‐vinylheterocyclic monomers; it is assumed that it results from a limited stabilization of the corresponding radicals. In the case of 4(5)‐vinyl‐1,2,3‐triazole, copolymerizations carried out at different temperatures and varied monomer concentrations show that intermolecular monomer association (as evidenced by NMR and IR measurements) does neither affect the copolymer composition nor the internal monomer t