NDLI: Relation between dielectric and mechanical losses in ferroelectric poly(vinylidene fluoride

Content Provider	IEEE Xplore Digital Library
Author	Frübing, P. Feipeng Wang Günter, C. Gerhard, R. Wegener, M. Jaunich, M. Stark, W.
Copyright Year	2010
Description	Author affiliation: Institute of Earth- and Environmental Sciences, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam, Germany (Günter, C.) \|\| Federal Institute for, Materials Research and Testing, Unter den Eichen 87, 12205 Berlin, Germany (Jaunich, M.; Stark, W.) \|\| Fraunhofer Institute for, Applied Polymer Research, Geiselbergstraße 69 14476 Potsdam, Germany (Wegener, M.) \|\| Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam, Germany (Frübing, P.; Feipeng Wang; Gerhard, R.)
Abstract	The temperature dependences of dielectric permittivity and elastic modulus of poly(vinylidene fluoride — hexafluoropropylene) (P(VDF-HFP)) are compared and explained by use of structural data obtained by differential scanning calorimetry and X-ray analysis. Special emphasis is put on the effect of uniaxial stretching which renders the polymer ferroelectric. It is shown that dielectric and mechanical relaxations at the glass transition (α relaxation) are closely related and not significantly affected by stretching. It is further confirmed that stretching destroys the non-polar spherulitic crystalline structure and produces relatively small-sized polar crystallites. This manifests in the disappearence of the so-called α relaxation which is associated to molecular motions within the spherulitic crystalline lamellae. However, there are discrepancies between dielectric and mechanical losses above the glass transition which point towards a still not described structural transition.
Starting Page	1
Ending Page	4
File Size	189345
Page Count	4
File Format	PDF
ISBN	9781424479450
e-ISBN	9781424479443
e-ISBN	9781424479436
DOI	10.1109/ICSD.2010.5567936
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-07-04
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dielectric losses Permittivity Glass X-ray scattering Films Polymers uniaxial stretching Poly(vinylidene fluoride — hexafluoropropylene) P(VDF-HFP) ferroelectric polymer dielectric relaxation dynamic mechanical analysis
Content Type	Text
Resource Type	Article

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