Copolymers of 4(5)-vinylimidazole and ethyleneglycol methacrylate phosphate: Synthesis and proton conductivity properties

摘要

A series of copolymers were produced by conventional free-radical polymerization of ethyleneglycol methacrylate phosphate (EGMAP) and 4(5)-vinylimidazole (4-VIm) at several feed compositions using DMF as solvent. The copolymers were characterized by ~1H NMR and FT-IR. Copolymer compositions were obtained by elemental analysis. Reactivity ratios of the monomers are equal to: r_1 = 0.12 ± 0.03 and r_2 = 0.19 ± 0.05 for 4-VIm-EGMAP system that exhibited an alternating behavior. Thermal properties of the dry copolymers were investigated via thermogravimetry analysis (TG) and differential scanning calorimetry (DSC). The ion exchange capacity (IEC) and anhydrous proton conductivities of the samples were measured and analyzed according to copolymer composition.