Dresden 2006 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 27: POSTER Polymer Physics and Materials

CPP 27.33: Poster

Thursday, March 30, 2006, 17:00–19:00, P2

Cyclo-olefin-polymer ferroelectrets: Electric charging, piezoelectric activity and thermal stability — •Olena Voronina, Michael Wegener, Werner Wirges, and Reimund Gerhard-Multhaupt — University of Potsdam, Department of Physics, Am Neuen Palais 10, D-14469 Potsdam, Germany

Non-cellular cyclo-olefins are known for their good charge-trapping properties. Their charge stability is quite comparable to that of the best known polymer electrets FEP and PTFE [1]. Thus, cyclo-olefins are interesting candidates for the development of piezoelectric polymer foams, so-called ferroelectrets. Ferroelectrets are cellular polymer films containing air-filled voids. Their piezoelectricity is based on an optimized combination of bipolar internal charging of the voids (which thus become giant electric dipoles) and of a rather low elastic modulus. An applied mechanical stress changes the void size and leads to an electrical signal.

Recently, cyclo-olefin polymers were developed into ferroelectret polymer films [2]. We briefly describe the preparation process and discuss the electric charging, the piezoelectric properties and the thermal stability of the new ferroelectrets. The results demonstrate that the piezoelectric activity is thermally stable at least up to 110^∘C, which is a significant improvement of the service temperature in comparison to other ferroelectret polymers.

[1] G. M. Sessler, G. M. Yang and W. Hatke, Annual Report CEIDP, IEEE Service Center, Piscataway NJ, 467-470 (1997).[2] A.-M. Savijärvi, M. Paajanen, E. Saarimäki, and H. Minkkinen, Proc. 12th Intern. Symp. on Electrets (ISE12), IEEE Service Center, Piscataway NJ, 75-78 (2005).