Regensburg 2002 – wissenschaftliches Programm

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DF: Dielektrische Festkörper

DF 2: Elektrische und optische Eigenschaften II

DF 2.1: Hauptvortrag

Montag, 11. März 2002, 14:30–15:10, 11

Ferroelectric Liquid Crystalline Elastomers - Novel Materials for Nanotechnology — •Friedrich Kremer — Universität Leipzig, Fakultät für Physik und Geowissenschaften, Linnéstr. 5, 04103 Leipzig, Germany

Ferroelectric Liquid Crystalline Elastomers (FLCE) form a novel class of materials with an extraordinary profile of features: They are ferroelectric and hence piezoelectric, they can be prepared as elastomeric No-dqsingle crystalsNo-dq on a macroscopic (∼ cm) scale and they can be obtained as self-supporting thin (∼µm) and (ultra)-thin molecular layers. Furthermore their viscoelastic properties can be tailored by use of a photochemical crosslinking reaction.

The structure and mobility of FCLE is studied by employing polarized, time-resolved Fourier-Transform IR-spectroscopy. This enables to analyse in detail the reorientation of the single molecular moieties in the supramolecular system (angle of reorientation, time constant, phase relationship) in response to an external electric field. To measure the (inverse) piezoelectric effect interferometric and x-ray methods are used. It is discovered that FLCE in a proper crosslinking density show the highest electrostrictive coefficients which were found up to now for organic materials. A microscopic interpretation of the observed marcoscopic effects will be presented.

FLCE offer a strong technological impact especially as materials for sensors and actuators in microsystem technology.