Abstract
Amorphous network polymer electrolytes were derived from poly(propylene oxide) and tris(4-isocyanatophenyl)thiophosphate complexed with lithium perchlorate. The complex impedance diagrams of the higher crosslink density samples were found to be a superposition of two semicircles having different relaxation times. On the other hand, the diagrams of the lowest crosslink density samples were a single semicircle. The Cole-Cole equation was employed to evaluate the relaxation parameters. The higher frequency process was assigned to ionic motions associated with segmental motions of the propylene oxide chain, and the lower frequency process was assigned to ionic motions associated with segmental motions of the urethane group. Dynamic mechanical thermal spectra show two relaxation peaks in the higher cross-link density samples and T 1 ϱ as a function of temperature obtained by 7Li n.m.r. study has a well defined minimum. These results indicate the correlation between the ionic mobility and the molecular motions of the network system.
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