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| - Synthesis, Properties, and Polymerization of New Liquid Crystalline Monomers for Highly Ordered Guest−Host Systems
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| Abstract
| - Stable cross-linked polymeric networks with high anisotropic absorption can be obtained by in situ photopolymerization of guest−host systems based in a mixture of liquid crystalline monomers and a dichroic dye. Samples are aligned by surface forces and photopolymerized at room temperature in the highly ordered SB phase.
- The present study is aimed at the preparation of highly ordered guest−host systems based in liquid crystalline materials with potential application in the preparation of thin film polarizers. To accomplish this purpose, we carried out the design, synthesis, and mesomorphic characterization of new reactive liquid crystalline monomers. All the compounds exhibited liquid crystalline behavior. The effect of structural variations on the mesomorphic properties was investigated. The existence of a highly ordered lamellar phase (SB) within the mesomorphic behavior of the reactive monomers was confirmed by polarized optical microscopy (POM) and X-ray diffraction (XRD) techniques. Four series of photopolymerisable dichroic mixtures including a dye (G205) and different percentages of the liquid crystal monomers were prepared. The dichroic ratio DR and order parameter S of the dye in the different liquid crystal matrixes were determined by polarized UV−vis spectroscopy in aligned samples. In situ photopolymerization of the liquid crystalline mixtures at room temperature in the highly ordered SB phase resulted in the formation of cross-linked polymeric networks in which the anisotropic absorption of the film was fixed. High dichroic ratio values, exceeding 50, were measured for some of the anisotropic networks. The thermal stability of the anisotropic films obtained was also studied.
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| - New LC Monomers for Ordered Guest−Host Systems
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