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Polymer Relaxational Dynamics Associated With Ionic Conduction in Confined Geometry

Published online by Cambridge University Press:  11 February 2011

J.-M. Zanotti,
L. J. Smith,
E. Giannelis,
P. Levitz,
D. L. Price and
M.-L. Saboungi
J.-M. Zanotti
Affiliation:
Intense Pulsed Neutron Source, Argonne Nat. Lab., Argonne, IL 60439, USALaboratoire Leon Brillouin (CEA-CNRS), CEA Saclay, 91191 Gif/Yvette cedex, France
L. J. Smith
Affiliation:
Material Science Division, Argonne Nat. Lab., Argonne, IL 60439, USA
E. Giannelis
Affiliation:
Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA
P. Levitz
Affiliation:
LPMC (CNRS), Ecole Polytechnique, Palaiseau, France
D. L. Price
Affiliation:
Intense Pulsed Neutron Source, Argonne Nat. Lab., Argonne, IL 60439, USACRMHT (CNRS), Avenue de la Recherche Scientifique, 45071 Orléans, France
M.-L. Saboungi
Affiliation:
Material Science Division, Argonne Nat. Lab., Argonne, IL 60439, USACRMD(CNRS), Avenue de la Recherche Scientifique, 45071 Orléans, France
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Abstract

Results of a quasi-elastic incoherent neutron scattering study of the influence of confinement on polyethylene oxide (PEO) and (PEO)8Li+[(CF3SO2)2N]- (or (POE)8LiTFSI) dynamics are presented. The confining media is Vycor, a silica based hydrophilic porous glass. We observe a strong slowing down of the bulk polymer dynamics under presence of Li salt. The confinement also affects dramatically the apparent mean-square displacement of the polymer. As supported by DSC measurements, the PEO melting transition at 335 K is strongly attenuated under confinement, suggesting that confinement modifies the global structure of the system, increasing the fraction of amorphous PEO by respect to crystalline phase. Local relaxational PEO dynamics is successfully described by the DLM (Dejean-Laupretre-Monnerie) model usually used to interpret NMR spin-lattice relaxation time data. The scattering vector dependence of the correlation times deduced from inelastic neutron scattering data is found to obey a power-law dependence. DSC and preliminary ionic conduction measurements are also presented.

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References

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