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- W2017887672 abstract "Siloxane-polypropyleneoxide (PPO) hybrids doped with sodium perchlorate (NaClO 4 ) obtained by the sol gel process were prepared with two PPO molecular weights (2000 and 4000 g/mol) and two sodium concentrations such as [O]/[Na] = 4 and 15 (O being the ether-type oxygen of PPO chains). The structure of these hybrids was investigated by 23 Na nuclear magnetic resonance (NMR) and X-ray absorption spectroscopy at the sodium K-edge (1071.8 eV) whereas complex impedance spectroscopy was used to determine their ionic conductivity. Three sodium sites were determined by NMR. The conjunction of NMR and X-ray absorption results allows us to identify one site in which Na is in a NaCI structure, a second one in which Na is in contact with perchlorate anions. The third site is attributed to mobile sodium species in interaction with the polymeric chain. The relative proportion of the different sites in the materials determines the ionic conductivity of the materials at room temperature: the largest ionic conductivity is 8.9 × 10 -6 Ω -1 cm -1 and is observed on the material with the larger amount (at least 85%) of sites in which sodium interacts with the polymer." @default.
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- W2017887672 date "2002-06-01" @default.
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- W2017887672 title "Siloxane–polypropyleneoxide hybrid ormolytes: structure–ionic conductivity relationships" @default.
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- W2017887672 doi "https://doi.org/10.1016/s0022-3093(02)01011-6" @default.
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