| Autor: |
Karlsson, C., Best, A. S., Swenson, J., Howells, W. S., Börjesson, L. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 3/1/2003, Vol. 118 Issue 9, p4206, 7p, 1 Diagram, 3 Charts, 5 Graphs |
| Abstrakt: |
The microscopic polymer dynamics in nanocomposite polymer electrolytes has been investigated using quasielastic neutron scattering experiments. Four samples based on the fully amorphous copolymer trihydroxy poly(ethylene oxide-co-propylene oxide) (3PEG) were investigated: 3PEG, 3PEG 1.5 mol/kg LiClO[sub 4], 3PEG 1.5 mol/kg LiClO[sub 4] 10 wt % TiO[sub 2], and 3PEG 1.5 mol/kg LiClO[sub 4] 20 wt % TiO[sub 2]. In addition to a slow relaxation giving rise to elastic scattering, at least two dynamical processes were observed: a fast, local chain motion and a slower diffusive segmental motion. No changes of the quasielastic peak widths could be observed between the filled or unfilled composites; however, the elastic scattering of the sample was found to increase upon addition of the filler to the polymer electrolyte. The results indicate the presence of a roughly 5-nm-thick immobilized polymer layer (∼5 vol %) around filler particles, while the dynamics of the bulk polymer (∼95 vol %) is not influenced by the filler. The results imply that the ionic conductivity increase observed in the nanocomposite polymer electrolyte cannot be attributed to enhanced polymer dynamics. © 2003 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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