11 December 2001 Characterization of PDLCs composed of the single liquid crystal component, K21, in a thiol-ene-based polymer
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Abstract
This paper investigates the effects of cure temperature and composition on the morphology of polymer dispersed liquid crystals (PDLCs) composed of the liquid crystal, K21 (4-heptyl-4'-cyanobiphenyl), in a thiol-ene based pre-polymer. PDLCs are composites composed of micron-size liquid crystal droplets dispersed in a solid polymer matrix. The PDLCs were fabricated by photo-initiated, polymerization induced phase separation using a differential photo-calorimeter (DPC). The cure temperatures were chosen based on the temperature-composition phase diagrams of the liquid crystal/pre-polymer mixtures. The characterization of the PDLCs included differential scanning calorimeter (DSC) to determine the nematic-to-isotropic transition temperature (TNI) of the liquid crystal and the glass transition temperature (Tg) of the polymer matrix. Scanning electron microscopy (ESEM) was used to examine phase separated morphology.
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Joe B. Whitehead, Nicole L. Gill, "Characterization of PDLCs composed of the single liquid crystal component, K21, in a thiol-ene-based polymer", Proc. SPIE 4463, Liquid Crystals V, (11 December 2001); doi: 10.1117/12.449949; https://doi.org/10.1117/12.449949
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