Journal
LIQUID CRYSTALS
Volume 43, Issue 2, Pages 276-284Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2015.1105311
Keywords
Phenyl-tolane; isothiocyanate liquid crystals; high birefringence; electrooptical property
Funding
- National Science Foundation of China [61378075, 61377032, 11174274, 11174279, 61205021]
- Science Foundation of State Key Laboratory of Applied Optics
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A series of 4'-(4-alkyl-phenyl)-2',6'-difluorotolane isothiocyanate liquid crystal (LC) compounds were synthesised, and their phase transitions and electrooptical properties were investigated. These compounds exhibit high birefringence, about 0.47-0.52. As the number of carbon atoms in the alkyl chains increases, these LC compounds can exhibit smectic phases. When these LCs were mixed into the commercial LCs, the birefringence values of LC mixtures become higher than pure commercial LCs, and the visco-elastic coefficients of five LC mixtures are very close to each other at every test temperature. The results of response properties indicate that the compounds with a tri-fluorine substitution and n-propyl end group possess better response performance than the others. These LC compounds are particularly attractive for achieving fast response times in LC optic devices. [GRAPHICS] .
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