Polymer electrolytes based on blends of poly(ether urethane) and polysiloxanes

Ionic conductivity of poly(ether urethane) (PEU)-based electrolyte increase d up to 10(-5) S/cm at room temperature by blending polysiloxane (KF50) or polyether-modified polysiloxane (KF615A) with PEU. Although the PEU/KF615A blend was a compatible system, the PEU/KF50 blend showed a phase-separated morphology. From the analyses of glass transition temperature, dielectric c onstant and ion mobility. it was suggested that the improvement of the cond uctivity is attributed to the increase of ion mobility. which compensates f or the decrease of ion density for the PEU/KF50 electrolyte and to the incr ease of both the ion mobility and ion density for the PEU/KF615A electrolyt e. (C) 2000 Elsevier Science Ltd. All rights reserved.