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- W2005446151 abstract "Solid organic−inorganic hybrid electrolytes based on diureasils doped with LiClO4 have been obtained by the sol−gel process through the reaction of poly(propylene glycol)-block-poly(ethylene glycol)-block-poly(propylene glycol) bis(2-aminopropyl ether) (H2N−PPG−PEG−PPG−NH2) with 3-isocyanatepropyltriethoxysilane (ICPTES), followed by co-condensation of an epoxy trialkoxysilane, 3-(glycidyloxypropyl)trimethoxylsilane (GLYMO). The structural and dynamic properties of the materials were systematically investigated by a variety of techniques including ac impedance, Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), multinuclear (13C, 29Si, 7Li) solid-state NMR, 1H−13C 2D WISE (wide-line separation) NMR, and 7Li pulsed gradient spin−echo (PGSE) NMR measurements. The length of backbone PEG chain, the extent of GLYMO cross-linking, and the salt concentration were varied in order to obtain the materials with high conductivities. A maximum ionic conductivity value of 1.37 × 10-5 S/cm was obtained at 30 °C for the hybrid electrolyte with a [O]/[Li] ratio of 32. This ionic conductivity value is 1 order of magnitude higher than that of previously characterized electrolytes based on ureasils without incorporation of GLYMO. The results of 13C cross-polarization magic-angle spinning (CPMAS) NMR with varying contact times and 1H−13C WISE NMR provided a microscopic view of the effects of salt concentrations on the dynamic behavior of the polymer chains. Only one distinct 7Li local environment was detected by variable temperature 7Li−{1H} MAS NMR. The temperature dependence of 7Li static line widths and self-diffusion coefficients showed that there is a strong correlation between the dynamic properties of the charge carriers and the bulk ionic conductivity." @default.
- W2005446151 created "2016-06-24" @default.
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- W2005446151 creator A5027712636 @default.
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- W2005446151 date "2007-11-01" @default.
- W2005446151 modified "2023-09-25" @default.
- W2005446151 title "Multinuclear Solid-State NMR Characterization, Ion Dissociation, and Dynamic Properties of Lithium-Doped Organic−Inorganic Hybrid Electrolytes Based on Ureasils" @default.
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- W2005446151 doi "https://doi.org/10.1021/ma071541c" @default.
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