6533b834fe1ef96bd129d52e
RESEARCH PRODUCT
Manipulation of the ferroelectricity in LC polymers via photomechanical isomerization of azobenzene moieties
Rudolf ZentelTanja ÖGesubject
Polymers and PlasticsChemistryMesogenOrganic ChemistryChromophoreCondensed Matter PhysicsFerroelectricityCis trans isomerizationchemistry.chemical_compoundDark stateAzobenzeneLiquid crystalPolymer chemistryMaterials ChemistrySide chainPhysical and Theoretical Chemistrydescription
We report the synthesis and characterization of a new ferroelectric liquid crystalline side chain copolymer containing photoisomerizable chromophores and non-photoisomerizable mesogenic units. On illumination with UV-light a suppression of the polar order is obtained as indicated by a substantial drop of the spontaneous polarization (Ps) compared to the dark state. We interpret this as the phase order being disrupted by the cis-isomer of the chromophore. After illumination with VIS-light only the major part of Ps is restored. The photochemical cis-trans back-isomerization (restoration of the phase) leads to a different stationary state than the dark state of the material. The thermal reisomerization (cis-trans) in the liquid-crystalline phase was observed to be faster than in solution by one order of magnitude.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1996-06-01 | Macromolecular Chemistry and Physics |