Polymer electrolytes, which are ubiquitous in all solid state devices, are of profound interest to electrochemists, who transform these materials into interesting multifunctional systems with great potential in many applications, such as super capacitors, solar cells, Li+ batteries, sensors and electrochromic displays (1,2). In this study the results of novel nanocomposites materials based on polymethacrylate hydroxyethylene resin doped with controlled quantities of different lithium salts are reported. The polymer electrolytes were characterized by measurements of total ionic conductivity at ambient temperature, differential scanning calorimetry and thermogravimetry. The electrolyte presents an ionic conductivity of 2.12 x 10-7 S.cm-1 at 24ºC and TGA analysis show that this polymer electrolyte system is thermally degraded at 200ºC.