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http://dx.doi.org/10.5012/bkcs.2011.32.8.3057

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)
Publication Information
Bulletin of the Korean Chemical Society / v.32, no.spc8, 2011 , pp. 3057-3062 More about this Journal
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.
Keywords
Ferroelectric liquid crystal; Cyclic co-oligomeric liquid crystal; Switching time; LCD; de Vriestype transition;
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