A random copolymer poly-vinylacetate-methyl methacrylate [P(VAc-MMA)] was synthesized via seeded emulsion copolymerization with vinyl acetate (VAc) and methyl methacrylate (MMA) as monomers, and the polymer electrolytes comprising a blend of the corresponding copolymer P(VAc-MMA) as a host polymer and LiClO₄ as a dopant were prepared by solution casting technique. Performances of the synthesized copolymer and prepared polymer membrane and electrolyte were studied by FTIR, ¹H NMR, SEM, XRD, TG, DSC, mechanical testing and alternating current (AC) impedance. According to these studies, it was found that P(VAc-MMA) had been formed; the copolymer membrane has a porous structure; the polymer electrolytes possess excellent thermal stability and fine mechanical performance; and the maximum ionic conductivity value reached 1.27×10^－3 S•cm^－1 with 25 wt% LiClO₄ at 25 ℃. The temperature dependence of the polymer electrolyte complexes appeared to obey Arrhenius equation.

Key words: polymer electrolyte, poly-vinylacetate-methyl methacrylate, ionic conductivity