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PO: Polymerphysik

PO 11: Poster: Flüssigkristalline Polymere

PO 11.1: Poster

Monday, March 17, 1997, 15:30–17:30, Gg

Electromechanical effects in ferroelectric liquid crystalline elastomers (FLCE) — •Walter Lehmann¹, Lutz Hartmann¹, Mario Keck¹, Friedrich Kremer¹, Peter Stein², and Heino Finkelmann² — ¹Universität Leipzig, Fak. f. Physik u. Geowiss., Abt. P.A.F., Linnestra"se 5, 04103 Leipzig — ²A.-Ludwigs-Universität Freiburg, Inst. f. Makromolekulare Chemie, Sonnenstr. 5, 79104 Freiburg

A highly stable Michelson interferometer has been built and we can present a resolution of less than 100 fm in dynamical measurements. This setup has been used for the examination of the inverse electromechanical effects in ferroelectric liquid crystalline elastomers (FLCE). The temperature- and DC-dependence of the inverse effects (coupling to electric fields) and the direct effects (coupling to mechanical stress) are demonstrated. We can report inverse piezoelectric coefficients higher than those of classical piezoceramics like Bariumtitanate or PZT.