Synthesis and characterisation of photopolymerisable liquid crystals based on the π-extended fluorene core and their corresponding non-reactive analogues |
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| Authors: | Jinsoo Kim Jimin Park Young Ju Jung Eun Chol Kim Taek Ahn Jae-Won Ka |
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| Institution: | 1. Information and Electronics Polymer Research Center, Korea Research Institute of Chemical Technology , Daejeon, Republic of Korea jinsoo@krict.re.kr;3. Information and Electronics Polymer Research Center, Korea Research Institute of Chemical Technology , Daejeon, Republic of Korea;4. Department of Chemistry , Kyungsung University , Busan, Republic of Korea |
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| Abstract: | We have synthesised a series of new reactive mesogens with photopolymerisable di-acrylates and their corresponding non-reactive analogues based on the π-conjugated aromatic core, fluorene (F)-di-thiophene (T)-benzene (B)], using the Stille and Suzuki coupling reaction. The effect of lateral alkyl chains on the 9-position of the central fluorene moiety as well as α, ω- side alkyl chains attached to the π-conjugated aromatic core on the mesomorphism was investigated by utilising differential scanning calorimetry (DSC) and polarising optical microscopy (POM). A wide angle X-ray scattering (WAXS) study at the various temperatures was also carried out to reveal phase structures. Photopolymerisable di-acrylates connected directly to the rigid aromatic core showed higher phase transition temperatures, probably due to the induced dipole moment in comparison with those of a non-reactive methyl–ether counterpart. |
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| Keywords: | reactive mesogens fluorene phase transition mesomorphism photopolymerisable di-acrylate |
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