Publicação: Investigation of New Ion Conducting Ormolytes Silica-Polypropyleneglycol
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Data
1999-12-01
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Coorientador
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Resumo
Two 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.
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Hybrid material, Ionic conductor, Silica-polypropyleneglycol, Solid electrolyte, Chemical bonds, Ionic conduction in solids, Lithium, Nuclear magnetic resonance, Polyethers, Silica, Sol-gels, Solid electrolytes, Spectroscopic analysis, Concentration (process), Inorganic compounds, Ionic conduction, Organic compounds, Polymers, Thermal effects, Organically modified electrolytes, Polypropylene glycols, Hybrid materials, Ionic conductors, Lithium salts, Polyelectrolytes, Ions
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Inglês
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Journal of Sol-Gel Science and Technology, v. 13, n. 1-3, p. 909-913, 1999.