Physical properties of polymer electrolytes: nuclear magnetic resonance investigation and comparison with

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Abstract
The physical properties of the ionic conductor , obtained by dissolution of lithium trifluoromethanesulphonylimide in poly(propylene oxide), have been investigated for several values of n. The glass transition temperature has been established from both DSC and NMR techniques. The diffusion coefficients of -containing species have been determined by the pulsed magnetic field gradient technique. The behaviour of the proton relaxation time versus temperature and concentration has been correlated to the glass temperature. The behaviour of the proton transverse relaxation function, obtained by the spin-echo technique, has been interpreted using a simple model in which two regimes and consequently two transverse relaxation times coexist and are assigned to the `entangled' and `non-entangled' parts of the high-molecular-weight polymer chains investigated.

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