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Nearly constant dielectric loss behavior in ionomers
A Linares1, M J Cánovas, T A Ezquerra
1Instituto de Estructura de la Materia, CSIC, Serrano 119, 28006 Madrid, Spain. alinares@iem.cfmac.csic.es
The Journal of Chemical Physics
|July 8, 2008
Summary
Electrical conductivity in ionomers follows Jonscher power law and nearly constant loss behaviors. Ion hopping of mobile ions governs this conduction mechanism, offering insights into ionomer conductivity.
Area of Science:
- Materials Science
- Solid-State Physics
- Electrochemistry
Background:
- Ionomers are polymers with ionic functional groups, crucial for applications like fuel cells and batteries.
- Understanding their electrical conductivity is key to optimizing material performance.
- Previous studies have explored ion transport in various ionic materials.
Purpose of the Study:
- To characterize the electrical conductivity of ionomers across a wide range of frequencies and temperatures.
- To identify and analyze the dominant conduction mechanisms within these ionomers.
- To compare ionomer conductivity behavior with inorganic ionic conductors.
Main Methods:
- Electrical conductivity measurements were performed on a series of ionomers.
- Measurements spanned a broad spectrum of frequencies and temperatures.
- Analysis involved examining Jonscher power law (JPL) and nearly constant loss (NCL) behaviors.
Main Results:
- Ionomers exhibited Jonscher power law at low frequencies and nearly constant loss at higher frequencies.
- The nearly constant loss behavior in ionomers was qualitatively similar but lower in magnitude compared to inorganic ionic conductors.
- Conductivity master curves indicated a unified conduction mechanism.
Conclusions:
- The electrical conductivity in ionomers is governed by ion hopping of mobile ions.
- Both Jonscher power law and nearly constant loss behaviors are integral to the ion hopping mechanism.
- These findings provide a deeper understanding of charge transport in ionomers.
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