Quasi-elastic neutron scattering investigation of dynamics in polymer electrolytes

Russina, A. I.; Telling, M. T. F.; Triolo, A.; Aihara, Y.; Grimm, H.

doi:10.1021/ma0493574

Journal Article

PreJuSER-43037

Quasi-elastic neutron scattering investigation of dynamics in polymer electrolytes

Russina, A. I. ; Triolo, A. ; Aihara, Y. ; Telling, M. T. F. ; Grimm, H.FZJ*

2004
Soc. Washington, DC

Macromolecules 37, 8653 - 8660 (2004) [10.1021/ma0493574]

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Please use a persistent id in citations: http://hdl.handle.net/2128/1115 doi:10.1021/ma0493574

Abstract: Polymer dynamics in a cross-linked poly(ethylene oxide-propylene oxide) random copolymer, both neat and doped with an inorganic salt, is investigated by means of quasi-elastic neutron scattering (QENS) as a function of temperature and momentum transfer. Data from a high-resolution backscattering instrument are reported. We present an original approach to the analysis of inelastic fixed energy scans. The findings from this approach lead to a detailed description of the polymer dynamics across the glass transition. The neat polymer dynamics is modeled in terms of two relaxation processes: Below the glass transition, the methyl side group hopping relaxation has been characterized and compared with the similar process occurring in pure poly(propylene oxide). Above the glass transition, a non-Debye, non-Arrhenius relaxation occurs, corresponding to the polymer segmental dynamics. In the case of the salt-doped rubber, the segmental dynamics is found to be more complex: while the methyl group dynamics is not affected by the salt addition, the present data set supports the view of a bimodal segmental dynamics as a consequence of salt addition.

Keyword(s): J

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