Browsing by Author "HSIEH, PJ"

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SYNTHESIS AND X-RAY-DIFFRACTION OF FERROELECTRIC LIQUID-CRYSTALLINE POLYSILOXANES CONTAINING 4'-(2-CHLORO-3-METHYL-PENTANOYLOXY)-4-ALKANYLOXYBIPHENYL SIDE-GROUPS
(1994-07-01)
HSIUE, GH
;
HSIEH, PJ
;
WU, SL
;
HSU, CS
;
應用化學系
The synthesis and characterization of side-chain liquid crystalline polysiloxanes containing (2S,3S)-4'-(2-chloro-3-methylpentanoyloxy)-4-alkanyloxybiphenyl side groups are presented. All the obtained polymers exhibit smectic mesomorphism. Those polymers containing a spacer length longer than 8 methylene units reveal respectively enantiotropic S(A), S(C)* and S(B) phases. The result demonstrates that the tendency toward the S(C)* phase increases with increasing the spacer length.