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RESEARCH PRODUCT
Ferroelectric liquid-crystalline elastomers
Gerhard WagenblastRudolf ZentelKarl SiemensmeyerMartin Brehmersubject
Materials sciencePolymers and PlasticsCondensed matter physicsOrganic ChemistryCondensed Matter PhysicsElastomerPiezoelectricityFerroelectricityStress (mechanics)Switching timeHysteresisLiquid crystalPolymer chemistryMaterials ChemistryPolarPhysical and Theoretical Chemistrydescription
Oriented liquid-crystalline (LC) elastomers (polar monodomains, concerning the direction of polarisation) have been prepared from polar monodomains of ferroelectric LC-polysiloxanes by a radical photocrosslinking process. Attempts to perform ferroelectric switching lead in these soft elastomers to an elastic stress which prohibits—for low voltages—a complete reorientation of the polar axis (ferroelectric switching). A ferroelectric switching can, however, be observed for high voltages. The loop of hysteresis of this switching is asymmetric concerning the zero point of the driving voltage. Piezoelectric measurements show that these elastomers combine an elastic memory for one polar state with enough flexibility to allow a reorientation of the polar axis.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1994-06-01 | Macromolecular Chemistry and Physics |