Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Cyclic Co-oligomeric Ferroelectric Liquid Crystals with Fast Switching Properties, Wide SmC* Temperature Range and de Vries-type SmA*-SmC* Transition

  • Park, Seung-Beom (Department of Chemistry, Seoul National University) ;
  • Cho, Tai-Yon (Department of Chemistry, Seoul National University) ;
  • Yoon, Kyung-Hwan (Department of Chemistry, Seoul National University) ;
  • Chang, Ji-Young (School of Materials Science and Engineering, Seoul National University) ;
  • Zentel, Rudolf (Institute of Organic Chemistry, University of Mainz) ;
  • Yoon, Do-Y. (Department of Chemistry, Seoul National University)
  • Received : 2011.05.06
  • Accepted : 2011.06.18
  • Published : 2011.08.20
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Abstract

We have synthesized and characterized the first cyclic co-oligomeric ferroelectric liquid crystals (FLCs) based on cyclic siloxanes and found that the co-oligomer containing two different mesogenic units exhibits $SmC^*$ mesophase over a wide temperature range from $65^{\circ}C$ to $135^{\circ}C$, much wider than those of the monomer counterparts and the cyclic homo-oligomers. The cyclic co-oligomeric liquid crystal readily filled the display cell and exhibited fast switching times in the range of 4 ms to 6 ms over the entire $SmC^*$ phase. Moreover, the practical absence of layer shrinkage, attributed to de Vries-type transition, shows an additional significant advanage for cyclic co-oligomeric FLCs in LCD applications.

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References

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