Browsing by Author "TSAY, KT"

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SYNTHESIS AND CHARACTERIZATION OF SIDE-CHAIN LIQUID-CRYSTALLINE POLYMETHACRYLATES CONTAINING FLUORINATED DIPHENYLDIACETYLENE SIDE-GROUPS
(1994)
LU, YH
;
TSAY, KT
;
HSU, CS
;
CHANG, HL
;
應用化學系
The synthesis of four side-chain liquid crystalline polymethacrylates containing either 4-alkanyloxy-4'-flourodiphenyldiactylenes or 4-alkanyloxy-3',4'-difluorodiphenyldiacetylenes side groups is presented. The phase behavior of both monomeric and polymeric liquid crystals was characterized by differential scanning calorimetry and optical polarizing microscopy. All synthesized polymethacrylates present nematic mesomorphism. The glass transition temperature of the obtained polymers decreases as the spacer length increases. The mesomorphic behavior of the prepared polymers depends very much on the degree of substitution of the mesogenic side groups on the polymer backbones.
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.