Ionic conductivity and FT-IR studies on plasticized PVC/PMMA blend polymerelectrolytes

Ionic conductivities of plasticized poly(vinylchoride) (PVC)/poly(methylmet hacrylate) (PMMA) blend electrolyte films containing two different lithium salts, viz., lithium tetrafluroborate (LiBF4) and lithium perchlorate (LiCl O4) are studied using the AC impedance technique at 25 degrees C, 40 degree s C, 50 degrees C and 60 degrees C. A mixture of ethylene carbonate (EC) an d propylene carbonate (PC) is used as the plasticizer. Pure PMMA and PMMA-r ich phases exhibited better conductivity. The variation of ionic conductivi ty for different plasticizer contents and for different lithium salts is re ported. The variation in film morphology is examined by scanning electron m icroscopic examination. Finally, the existence of ion-ion pairs has been id entified using Fourier Transform infrared analysis (FT-IR) measurements. (C ) 2000 Elsevier Science S.A. All rights reserved.