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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 8
BKCSDE 32(8)
August 20, 2011 

 
Title
Cyclic Co-oligomeric Ferroelectric Liquid Crystals with Fast Switching Properties, Wide SmC* Temperature Range and de Vries-type SmA*-SmC* Transition
Author
Seung Beom Park, Tai-Yon Cho, Kyung-Hwan Yoon, Ji Young Chang, Rudolf Zentel, Do Y. Yoon*
Keywords
Ferroelectric liquid crystal, Cyclic co-oligomeric liquid crystal, Switching time, LCD, de Vriestype transition
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 oC to 135 oC, 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.
Page
3057 - 3062
Full Text
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