- Helical carbon and graphite films prepared from helical poly(3,4-ethylenedioxythiophene) films synthesized by electrochemical polymerization in chiral nematic liquid crystals
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Helical carbon and graphite films from helical poly(3,4- ethylenedioxythiophene) (H-PEDOT) films synthesized through electrochemical polymerization in a chiral nematic liquid-crystal (N-LC) field are prepared. The microscope investigations showed that the
- Matsushita, Satoshi,Yan, Bairu,Yamamoto, Shinsuke,Jeong, Yong Soo,Akagi, Kazuo
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- Liquid crystallinity-embodied imidazolium-based ionic liquids and their chiral mesophases induced by axially chiral tetra-substituted binaphthyl derivatives
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We synthesised novel imidazolium-based ionic liquids with thermotropic liquid crystallinity by introducing phenylcyclohexyl and/or cyanobiphenyl mesogenic cores and hexyl or dodecyl methine chains into both sites of imidazolium moieties facing bromide anions. The liquid crystalline ionic liquids (LCILs) thus synthesised showed a nematic or smectic mesophase in both the heating and cooling processes, indicating the enantiotropic nature of the liquid crystallinity. The LCILs bearing the same types of double mesogenic cores [LCIL-2] showed a smectic A phase in the temperature range from 115 to 175 °C, whereas the LCILs with different types of double mesogenic cores [LCIL-3 and LCIL-4] showed nematic phases in the temperature ranges from 58 to 88 °C and 43 to 95 °C, respectively. The axially chiral binaphthyl derivatives substituted by LC groups at the 2,2′, 6,6′ positions of the binaphthyl rings were synthesised and used as chiral dopants with large helical twisting powers. The mixtures of the LCILs and the (R)- and (S)-binaphthyl derivatives exhibited induced chiral nematic phases with right-and left-handed helical senses, respectively. The ionic conductivities of the LCILs were evaluated to be 10-7-10-4 S cm-1, depending on the isotropic, LC, and crystal phases. The temperature dependence of the ionic conductivities indicates that the LCILs can be regarded as semi-conducting materials. The LCILs might be used as anisotropic ionic conductors and can even serve as anisotropic solvents and electrolytes in electrochemical polymerisations. This journal is
- Ahn, Sangbum,Yamakawa, Shohei,Akagi, Kazuo
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- The structural effects on the pretilt angle of alignment materials with alkylcyclohexylbenzene as a side chain in polyimides
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We have investigated the relationship between the surface property of rubbed polyimides and the variation of pretilt angle according to the side chain and main chain structures. We calculated the surface free energy of synthesized polyimide surface by mea
- Lee, Jong-Beom,Lee, Hyun-Kyung,Park, Jae-Chul,Kim, Yong-Bae
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p. 161/[2027]-172/[2038]
(2005)
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- 3-Chloropyridines, and their use in liquid-crystal mixtures
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3-Chloropyridines, process for their preparation, and their use in liquid-crystal mixtures A 3-chloropyridine of the formula (I) STR1 in which the symbols have the following meaning: R1 and R2, independently of one another, are, for example, H or straight-chain or branched alkyl, A1, A2, A3 and A4 are identical or different and are, for example, 1,4-phenylene, pyrazine-2,5-diyl or trans-1,4-cyclohexylene, M1, M2, M3 and M4 are identical or different and are, for example, --O-- or --CO--O--, R3, R4, R6 and R7, independently of one another are, for example, H or straight-chain or branched alkyl, M5 is, for example, --O--CO-- or a single bond, k, l, m, n, o, p, q and r are zero or one, with the proviso that the sum k+m+p+r is less than 4 and greater than zero, can advantageously be employed as a component in ferroelectric liquid-crystal mixtures.
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