Dahmouche, K. [UNESP]De Souza, P. H.Bonagamba, T. J.Paneppucci, H.Judeinstein, P.Pulcinelli, Sandra Helena [UNESP]Santilli, Celso Valentim [UNESP]2014-05-272014-05-271999-12-01Journal of Sol-Gel Science and Technology, v. 13, n. 1-3, p. 909-913, 1999.0928-0707http://hdl.handle.net/11449/65922Two groups of hybrid organic-inorganic composites exhibiting ionic conduction properties, so called ORMOLYTES (organically modified electrolytes), have been prepared by the sol-gel process. The first group has been prepared from mixture of a lithium salt and 3-isocyanatopropyltriethoxysilane(IsoTrEOS),O,O′-bis(2-aminopropyl) polypropyleneglycol. These materials produce chemical bonds between the organic (polymer) and the inorganic (silica) phases. The second group has been prepared by an ultrasonic method from a mixture of tetraethoxysilane (TEOS), polypropyleneglycol and a lithium salt. The organic and inorganic phases are not chemically bonded in these samples. The Li+ ionic conductivity, σ, of all these materials has been studied by AC impedance spectroscopy up to 100°C. Values of σ up to 10-6 Ω-1·cm-1 have been found at room temperature. A systematic study of the effects of lithium concentration, polymer chain length and the polymer to silica weight ratio on σ shows that there is a strong dependence of σ on the preparation conditions. The dynamic properties of the Li+ ion and the polymer chains as a function of temperature between -100 and 120°C were studied using 7Li solid-state NMR measurements. The ionic conductivity of both families are compared and particular attention is paid to the nature of the bonds between the organic and inorganic components.909-913engHybrid materialIonic conductorSilica-polypropyleneglycolSolid electrolyteChemical bondsIonic conduction in solidsLithiumNuclear magnetic resonancePolyethersSilicaSol-gelsSolid electrolytesSpectroscopic analysisConcentration (process)Inorganic compoundsIonic conductionOrganic compoundsPolymersThermal effectsOrganically modified electrolytesPolypropylene glycolsHybrid materialsIonic conductorsLithium saltsPolyelectrolytesIonsArtigo10.1023/A:1008627424438WOS:000078468200161Acesso restrito2-s2.0-0032305921997120258528696755842986818708650000-0002-8356-8093