Preparation of conjugated polymeric columns with a hexagonal symmetry from star-shaped supramolecular liquid crystals |
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| Authors: | Jun Hyup Lee Hye Jin Lee Seung Jun Lee Jisun Jang Seung Hoo Yoo Jae Young Jho |
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| Institution: | 1. School of Chemical and Biological Engineering , Seoul National University , Seoul , Korea;2. College of Optics and Photonics , University of Central Florida , Orlando , Florida , USA junhyup.lee@creol.ucf.edu jyjho@snu.ac.kr;4. School of Chemical and Biological Engineering , Seoul National University , Seoul , Korea |
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| Abstract: | New conjugated polymeric columns with a hexagonal symmetry were prepared via topochemical polymerisation of star-shaped supramolecular liquid crystals formed by hydrogen bonding between a phloroglucinol core and pyridine derivatives containing a diacetylenic group in the alkyl chain. The mesomorphic properties of the supramolecular monomer and its photopolymerisation behaviour were investigated. The supramolecular liquid crystal exhibited a rectangular columnar mesophase. Photopolymerisation of supramolecular monomer along the column axis in the liquid crystalline state provided well-ordered conjugated polydiacetylenic columns with a two-dimensional hexagonal symmetry. Fourier transform infrared and ultraviolet–visible spectroscopy affirmed that conjugated polydiacetylenes were produced by 1,4-polymerisation of the supramolecular monomer along the column axis. X-ray diffraction analysis showed that a two-dimensional columnar order in the supramolecular monomer was maintained after photopolymerisation, and that the resulting polydiacetylene had a hexagonal array of conjugated columns. Our controlled methodology provides a new route to conjugated polymeric columns with highly ordered structures by self-assembly and polymerisation of star-shaped supramolecular liquid crystals. |
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| Keywords: | hexagonal columns hydrogen bonding self-assembly star-shaped liquid crystals photopolymerisation |
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