Pyroelectric properties and dielectric hysteresis of a poly(vinyl alcohol) with azobenzene-alkoxy side chains

After thermal poling, pyroelectricity and a pronounced dielectric hysteresis have been observed on films of a poly(vinyl alcohol) with azobenzene-alkoxy side chains (Az-PVA). Based on dielectric spectroscopy data and structural information from differential thermal analysis, the pyroelectricity can...

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Bibliographic Details
Published in:Polymer (Guilford) 1999-06, Vol.40 (12), p.3413-3420
Main Authors: Frübing, P., Wegener, M., Gerhard-Multhaupt, R., Buchsteiner, A., Neumann, W., Brehmer, L.
Format: Article
Language:English
Subjects:
Applied sciences
Azobenzene group
Electrical, magnetic and optical properties
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Poly(vinyl alcohol)
Properties and characterization
Side-chain polymer
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Summary:After thermal poling, pyroelectricity and a pronounced dielectric hysteresis have been observed on films of a poly(vinyl alcohol) with azobenzene-alkoxy side chains (Az-PVA). Based on dielectric spectroscopy data and structural information from differential thermal analysis, the pyroelectricity can be explained with reversible dipole–density changes during thermal expansion, whereas the dielectric hysteresis is proposed to result from the polarisation caused by charge carriers, probably ions. These findings are also significant for the interpretation of dielectric hysteresis measurements on other polymer-electret materials.
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(98)00563-1