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Secondary relaxations and electrical conductivity in hyperbranched polyester amides

Broadband dielectric spectroscopy is used to investigate molecular dynamics and charge transport in three hyperbranched polyester amides with hydroxyl, phenyl, and stearate terminal groups. At higher temperatures, the dielectric spectra are interpreted in terms of hopping conduction in a spatially r...

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Bibliographic Details
Published in:Journal of polymer science. Part B, Polymer physics Polymer physics, 2010-07, Vol.48 (14), p.1651-1657
Main Authors: Turky, G, Sangoro, J.R, Abdel Rehim, M, Kremer, F
Format: Article
Language:English
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Summary:Broadband dielectric spectroscopy is used to investigate molecular dynamics and charge transport in three hyperbranched polyester amides with hydroxyl, phenyl, and stearate terminal groups. At higher temperatures, the dielectric spectra are interpreted in terms of hopping conduction in a spatially randomly varying energy landscape, whereas two secondary dipolar relaxations attributed to librations of the terminal and amide groups dominate the low temperature regime. Despite a shift of more than 3 decades in the dc conductivity upon variation of the end groups, the Barton-Nakajima-Namikawa relation is shown to hold.
ISSN:0887-6266
1099-0488
1099-0488
DOI:10.1002/polb.21966