Segmented polyurethane was synthesized from 4,4'-methylene bis(phenyl isocyanate), butanediol and polyoxytetramethylene glycol with molecular weight 2000 in tetrahydrofuran. In the previous paper, we manufactured the N-methyl substituted polyurethane and observed the morphology and mechanical property as a function of substitution degree. In this study, we observed the thermal, mechanical properties and conductivity as a function of LiClO4 Concentration in the N-methyl substituted polyurethane.