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11 December 2001 Vitrifying cholesteric materials with photopolymerizable groups: synthesis and holographic applications
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Eight novel low molecular weight liquid crystalline (LC) vitrifying materials with photopolymerizable acrylate groups have been synthesized. The molecules have a star-shaped topology with three and four arms. The mesogenic units were varied by the addition of lateral groups in different positions. In the case of the three-armed star-molecules crystallization from the melt was strongly suppressed. One of the three-armed stars (Triple-BTB) exhibits a nematic phase at room temperature and does not recrystallize for at least nine months. The photopolymerization behavior was studied over the whole liquid crystalline temperature range, and the novel nematic star-molecules were used as components for colored cholesteric polymer networks. Additionally, we describe the formation of holographic gratings in photopolymerizable cholesteric mixtures by using polarization holography, where we used two writing beams with perpendicular polarization instead of the usual setup with two writing beams with parallel polarization.
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Thomas Pfeuffer, Peter Strohriegl, Ulrich Theissen, and Stephan J. Zilker "Vitrifying cholesteric materials with photopolymerizable groups: synthesis and holographic applications", Proc. SPIE 4463, Liquid Crystals V, (11 December 2001);

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