Electrooptical Effects of Swollen Polydomain Liquid Crystal Elastomers

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  • Cho Dong-Uk
    Department of Applied Quantum Physics and Nuclear Engineering, Graduate School of Engineering, Kyushu University
  • Yusuf Yusril
    Department of Applied Quantum Physics and Nuclear Engineering, Graduate School of Engineering, Kyushu University
  • Hashimoto Shigehiro
    Department of Applied Quantum Physics and Nuclear Engineering, Graduate School of Engineering, Kyushu University
  • Cladis P. E.
    Advanced Liquid Crystal Technologies
  • Brand Helmut R.
    Theoretische Physik III, Universität Bayreuth
  • Finkelmann Heino
    Makromolekulare Chemie, Universität Freiburg
  • Kai Shoichi
    Department of Applied Quantum Physics and Nuclear Engineering, Graduate School of Engineering, Kyushu University Department of Applied Physics, Faculty of Engineering, and Department of Life Engineering, Graduate School of Systems Life Sciences, Kyushu University

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The electrooptical effects of polydomain liquid crystal elastomers (LCEs) swollen with low molecular weight liquid crystals (LMWLCs) have been investigated in detail. A well known LMWLC, 4-n-pentyl-4-cyanobiphenyl (5CB), is used as the solvent. The optical intensity of transmittance was measured as a function of voltage. The switching behavior was characterized by the voltage and time dependences of the transmittance on an instantaneous voltage switch. It is found that the threshold for the onset of the electrooptical effects is small (V∼1.0 V). The measured response time when switching on for the electrooptical effects is consistent with the response behavior of ordinary liquid crystals. However, the relaxation time when switching off shows a voltage independence and its value is about 4 times smaller than that of the electromechanical effect.

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