SYNTHESIS AND IONIC-CONDUCTIVITY STUDIES OF SOLID POLYMER ELECTROLYTES BASED ON MODIFIED ALTERNATING MALEIC-ANHYDRIDE COPOLYMER WITH OLIGO(OXYETHYLENE) SIDE-CHAINS

Comb-like polymers (CP) based on modified alternating methyl vinyl eth er/maleic anhydride copolymer with oligo-oxyethylene side chains of th e type-O(CH2CH2O)(n)CH3 have been synthesized and characterized, and c omplexed with LiNO3 to form an amorphous polymer electrolyte. CP/salt complexes showed conductivity up to 10(-5) S/cm at room temperature. T he temperature dependence of ionic conductivity suggests that the ion transport is controlled by segmental motion of the polymer, shown by l inear curves obtained in Vogel-Tammann-Fulcher plots. The ionic conduc tivity maximum moves to a higher salt concentration as the temperature increases. IR results also indicate that the ester in CP might decomp ose at 140 degrees C and reproduce the maleic anhydride ring.