Glass Transition and Relaxation Processes of Nanocomposite Polymer Electrolytes
- 22 June 2012
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry B
- Vol. 116 (26), 7762-7770
- https://doi.org/10.1021/jp3036499
Abstract
This study focus on the effect of δ-Al2O3 nanofillers on the dc-conductivity, glass transition, and dielectric relaxations in the polymer electrolyte (PEO)4:LiClO4. The results show that there are three dielectric relaxation processes, α, β, and γ, in the systems, although the structural α-relaxation is hidden in the strong conductivity contribution and could therefore not be directly observed. However, by comparing an enhanced dc-conductivity, by approximately 2 orders of magnitude with 4 wt % δ-Al2O3 added, with a decrease in calorimetric glass transition temperature, we are able to conclude that the dc-conductivity is directly coupled to the hidden α-relaxation, even in the presence of nanofillers (at least in the case of δ-Al2O3 nanofillers at concentrations up to 4 wt %). This filler induced speeding up of the segmental polymer dynamics, i.e., the α-relaxation, can be explained by the nonattractive nature of the polymer–filler interactions, which enhance the “free volume” and mobility of polymer segments in the vicinity of filler surfaces.This publication has 51 references indexed in Scilit:
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