title: Physical properties of [Formula: see text] polymer electrolytes: nuclear magnetic resonance investigation and comparison with [Formula: see text].
abstract: The physical properties of the ionic conductor [Formula: see text], obtained by dissolution of lithium trifluoromethanesulphonylimide in poly(propylene oxide), have been investigated for several values of n. The glass transition temperature [Formula: see text] has been established from both DSC and NMR techniques. The diffusion coefficients of [Formula: see text]-containing species have been determined by the pulsed magnetic field gradient technique. The behaviour of the proton relaxation time [Formula: see text] 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.
authors.affiliation: Laboratoire d'Ionique et d'Electrochimie des Solids (Unité associée au CNRS 1213), Institut National Polytechnique de Grenoble, BP 75, 38402 Saint Martin d'Hère Cédex, France. Laboratoire de Spectrométrie Physique (Unité associée au CNRS 08), Université J Fourier, BP 87, 38402 Saint Martin d'Hères Cédex, France.
authors.forename: C
authors.initials: C
authors.lastname: Roux
authors.forename: W
authors.initials: W
authors.lastname: Gorecki
authors.forename: J Y
authors.initials: JY
authors.lastname: Sanchez
authors.forename: M
authors.initials: M
authors.lastname: Jeannin
authors.forename: E
authors.initials: E
authors.lastname: Belorizky