Artículos de revistas
NMR study of ion-conducting organic-inorganic nanocomposites poly(ethylene glycol) - Silica - LiClO4
Fecha
2000-02-22Registro en:
Macromolecules. Washington: Amer Chemical Soc, v. 33, n. 4, p. 1280-1288, 2000.
0024-9297
10.1021/ma991624w
WOS:000085449800031
Autor
Universidade de São Paulo (USP)
Universidade Estadual Paulista (Unesp)
Univ Paris Sud
Inst Neue Mat
Institución
Resumen
Hybrid organic-inorganic ionic conductors, also called ormolytes, were obtained by dissolution of LiClO4 into silica/poly(ethylene glycol) matrices. Solid-state nuclear magnetic resonance (NMR) was used to probe the inorganic phase structure (Si-29) and the effects of the temperature and composition on the dynamic behavior of the ionic species (Li-7) and the polymer chains (H-1 and C-13). The NMR results between -100 and +90 degrees C show a strong correlation with ionic conductivity and differential scanning calorimetry experiments. The results also demonstrate that the cation mobility is assisted by segmental motion of the polymer, which is in agreement with the results previously reported for pure poly(ethylene oxide), PEG, electrolytes.