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Title: AC Conductivity and Relaxation Behavior in Ion Conducting Polymer Nanocomposite
Authors: Sharma, A. L.
Thakur, A. K.
Keywords: Polymer Nanocomposites
Dielectric Permittivity
Ion Dynamics
Glass Transition Temperature
Issue Date: Dec-2010
Publisher: Springer Link
Abstract: We report the ac conductivity and relaxation behavior analysis for a heterogeneous polymer-clay nanocomposite (PNC) having composition (polyacrylonitrile)8LiCF3SO3 + x wt.% dodecylamine modified montmorillonite. Charge transport behavior in an ionically conducting PNC has been analyzed systematically and correlated with the macroscopic parameters like polymer glass transition temperature and available free mobile charge carriers. Intercalation of cation coordinated polymer into the nanometric clay channels has been confirmed by high-resolution transmission electron microscopy. The electrical properties of the intercalated PNC films have been studied using complex impedance/admittance spectroscopy. Excellent correlation of relaxation behavior with polymer glass transition temperature (Tg) confirmed the objectives of the work. An analysis of dielectric relaxation indicates that PNC films are lossy when compared with polymer-salt film. This result is a direct outcome of faster ion dynamics leading to strong electrode polarization effect due to the accumulation of charge carriers at the interface.
Appears in Collections:2011

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