Amphiphilic taper-shaped oligomer exhibiting a monolayer smectic A to columnar phase transition |
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Authors: | Kazuhito Takeuchi Yoichi Takanishi Jun Yamamoto |
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Affiliation: | 1. Department of Frontier Materials Chemistry , Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho , Hirosaki, 036–8561, Japan;2. Department of Physics , Graduate School of Science, Kyoto University, Oiwake-cho, Kitashirakawa , Sakyo–ku, Kyoto, 606–8562, Japan |
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Abstract: | We prepared two series of liquid-crystalline oligomers composed of phenylpyrimidine based mesogenic cores, alkyl spacers and semiperfluorinated alkyl chains in one series and only alkyl chains in the second series. Their physical properties were investigated using optical microscopy, differential scanning calorimetry and X-ray diffraction measurements. The oligomers possessing a semiperfluorinated alkyl chain show a phase sequence of SmC–SmA–Col when the number of phenylpyrimidine moieties was increased. The compound possessing three phenylpyrimidine cores was found to exhibit monolayer SmA and Col phases. On the other hand, the oligomer composed of an alkyl chain and three phenylpyrimidine cores showed only a nematic phase. We discuss effects of the shape amphiphilicity and the hydrocarbon–fluorocarbon amphiphilicity on phase transition behaviour of the amphiphilic oligomers. |
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Keywords: | liquid crystals phase transition amphiphilicity oligomer |
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