Browsing by Author "WANG, SR"

Now showing 1 - 4 of 4

FLUORINATED DIPHENYL-DIACETYLENE AND TOLANE LIQUID-CRYSTALS WITH LOW THRESHOLD VOLTAGE
(1992-11-09)
WU, ST
;
HSU, CS
;
CHEN, YN
;
WANG, SR
;
應用化學系
Several new fluoro-alkoxy and alkenyloxy (alkoxy with a carbon-carbon double bond) diphenyl-diacetylene and tolane liquid crystals are synthesized and their physical properties evaluated. Double bond position is found to make a pronounced effect on elastic constant, phase transition temperature and heat fusion enthalpy, but little change on birefringence, dielectric anisotropy, and viscosity. These compounds exhibit a high birefringence, low viscosity, and low threshold voltage, and are particularly attractive for infrared light valves and polymer-dispersed liquid crystal displays.
FLUORODIPHENYLDIACETYLENE AND TOLANE LIQUID-CRYSTALS FOR DISPLAY APPLICATION
(1993-08-01)
WU, ST
;
HSU, CS
;
CHEN, YN
;
WANG, SR
;
LUNG, SH
Several fluorinated diphenyldiacetylene and tolane liquid crystals are synthesized and their physical properties evaluated. These liquid crystals exhibit a high resistivity, high birefringence, low viscosity, and modest dielectric anisotropy. Some difluoro compounds show a relatively low melting temperature and small heat fusion enthalpy and are useful for formulating eutectic mixtures. The mixtures consisting of these fluorinated compounds are particularly useful for active matrix, photoactivated light valve, and polymer-dispersed liquid crystal displays.
SYNTHESIS OF FLUORINATED NAPHTHYLPHENYLACETYLENIC AND NAPHTHYLPHENYLDIACETYLENIC LIQUID-CRYSTALS
(1995-10-01)
HSU, CS
;
TSAY, KT
;
CHANG, AC
;
WANG, SR
;
WU, ST
Four series of fluorinated tolanes, naphthylphenylacetylenes and naphthylphenyldiacetylenes were prepared and characterized. Most of the fluorinated tolanes exhibit no mesomorphic behaviour. However, most of the fluorinated naphthylphenylacetylenes and naphthylphenyldiacetylenes form enantiotropic nematic phases. The dielectric anisotropy and birefringence of some selected compounds were measured by a guest-host method. All of those studied show relatively high dielectric anisotropy and birefringence.
SYNTHESIS OF FLUORINATED NAPHTHYLPHENYLACETYLENIC AND NAPHTHYLPHENYLDIACETYLENIC LIQUID-CRYSTALS
(1995-10-01)
HSU, CS
;
TSAY, KT
;
CHANG, AC
;
WANG, SR
;
WU, ST
Four series of fluorinated tolanes, naphthylphenylacetylenes and naphthylphenyldiacetylenes were prepared and characterized. Most of the fluorinated tolanes exhibit no mesomorphic behaviour. However, most of the fluorinated naphthylphenylacetylenes and naphthylphenyldiacetylenes form enantiotropic nematic phases. The dielectric anisotropy and birefringence of some selected compounds were measured by a guest-host method. All of those studied show relatively high dielectric anisotropy and birefringence.