Electrooptical Effect of α-Olefinic Smectic Liquid Crystals

Abstract

Three kinds of a-olefinic liquid crystals, 4-[4-[(S)-2-methylbutoxycarbonyl]phenoxycar-bonyll]phenyl 10-undecenoate 1, 4-[4-[(S)-2-methylbutoxycarbonyl]phenyl]phenyl 10-undece-noate 2, and (S)-2-methylbutyl 4-[N-4-(10-undecenoyloxy)benzylideneamino]cinnamate 3were synthesized as reactive monomers for ferroelectric liquid crystalline comb-like polysiloxanes.1 shows a smectic A(S_A) state, while 2 and 3 show both S_A and chiral smectic C (S_C) state. From the electrooptical measurements, the response times for dual frequency drive in S_A state were found to be 30, 310, and 30 ms at O.1 Hz : 2.12, 7, and 2.67 s at 1 kHz for 1, 2 and 3, respectively. The response time for SSFLC in S_C phase was also found to be 460 and 105 μs for 2 and 3, respectively.