Artículos de revistas
Structure and electrical properties of potassium-doped siloxane-poly(oxypropylene) ormolytes
Fecha
2003-01-01Registro en:
Journal of Sol-gel Science and Technology. Dordrecht: Kluwer Academic Publ, v. 26, n. 1-3, p. 1075-1080, 2003.
0928-0707
10.1023/A:1020702606334
WOS:000178789100199
5584298681870865
9971202585286967
0000-0002-8356-8093
Autor
Universidade Estadual Paulista (Unesp)
Ctr Univ Paris Sud
Institución
Resumen
The structure and the ionic conduction properties of siloxane-poly(oxypropylene) (PPO) hybrids doped with different potassium salts (KCF3SO3, KI, KClO4 and KNO2) are reported for two polymer molecular weights (300 and 4000 g/mol), labelled PPO300 and PPO4000, respectively. The doping concentration, related to the concentration of the ether type oxygen of the PPO chain, is the same whatever the salt and verifies [O]/[K] = 20. Ionic room temperature conductivity shows the highest value for the KCF3SO3 doped PPO4000 hybrid (4 x 10(-7)Omega(-1).cm(-1)). The structure of these hybrids was investigated by X-ray powder diffraction (XRPD) and X-ray absorption spectroscopy (EXAFS and XANES) at the potassium K-edge (3607 eV). XRPD results show that the hybrid matrix is always amorphous and the formation of secondary potassium phases is observed for all the samples, except for the KCF3SO3 doped PPO4000 hybrid. EXAFS results evidence a good correlation between the ionic conductivity and the presence of oxygen atoms as first neighbours around potassium.