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- W2030542002 abstract "Novel terminal-terminal types of liquid crystalline bis[urethane]s 3, prepared from (S)-2-methylbutyl 4-[4-(11-hydroxyundecyloxy)benzylideneamino]cinnamate 2 and various diisocyanates, were studied by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). Bis[urethane]s 3c obtained from 1,3-diisocyanatobenzene and 3d from 2,4-diisocyanatotoluene exhibit a smectic state, while bis[urethane]s 3a obtained from 1,6-diisocyanatohexane, 3b from bis(4-isocyanatophenyl)methane and 3e from 2,6-diisocyanatotoluene show no mesophases. It was found from IR spectroscopic results that inter- and intramolecular hydrogen bondings due to N–H and C=O of urethane bonds play an important role in the formation of mesophase. The dual-frequency drive, based on light scattering driven by the application of an a.c. current at different frequencies, was studied in the smectic A state of 3c and 3d: τr at 0.1 Hz are 0.84 and 0.25 s, τr at 1 kHz are 9.75 and 8.95 s for 3c and 3d, respectively." @default.
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- W2030542002 date "1992-08-01" @default.
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- W2030542002 title "Terminal–Terminal Types of Liquid Crystals. III. Thermal and Electrooptical Behavior of Liquid Crystalline Bis[urethane]s" @default.
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- W2030542002 doi "https://doi.org/10.1246/bcsj.65.2259" @default.
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