IONIC-CONDUCTION OF LITHIUM OLIGO(ETHYLENEOXY)PHENYLSULFONATE AND ITSCOMPLEX WITH POLY(ETHYLENEOXIDE)

The organic lithium salt, lithium p-[methoxy oligo(ethyleneoxy)] pheny lsulfonate (EOnPSLi), possesses the ability of self-dissociation which leads to the exhibition of ionic conduction. The length of the ethyle neoxy repeating units in EOnPSLi has effects on the morphology, the se lf-dissociation ability, the 'salt' concentration, the ionic conductiv e behaviour and the activation energy of ion transport of the oligoeth er salt, which consequently influences the ionic conductivity. In the complex of poly(ethylene oxide) (PEO) and EO2PSLi, with a decrease of EO2PSLi content the phase structure of PEO changes gradually from a di spersed island-like structure to a well-distributed, continuous struct ure. The corresponding ionic conductive behaviour changes from Arrheni us type to non-Arrhenius type in which the transport of ion carriers d epends on the segmental movement of PEO macromolecules. (C) 1998 Elsev ier Science B.V. All rights reserved.