Quantitative analysis of photoalignment of liquid crystals on coumarin-containing polymer films

Chunki Kim; Anita Trajkovska; Jason U. Wallace; Shaw H. Chen

doi:10.1117/12.680029

7 September 2006 Quantitative analysis of photoalignment of liquid crystals on coumarin-containing polymer films

Chunki Kim, Anita Trajkovska, Jason U. Wallace, Shaw H. Chen

Proceedings Volume 6332, Liquid Crystals X; 633201 (2006) https://doi.org/10.1117/12.680029
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

Polymers containing 6- and 7-substituted coumarin moieties were prepared as photoalignment films through linearly polarized UV-irradiation to a varying fluence for an investigation of liquid crystal orientation. Model coumarin monomers and dimers were also synthesized and characterized as part of a novel approach to the interpretation of liquid crystal orientation in terms of the extent of dimerization, X. The experimental data for X as a function of fluence were used to validate the first-order kinetics with an exponentially decaying rate constant as the reaction proceeds. The kinetic model was employed to describe the evolutions of coumarin dimer's and monomer's orientational order. The model was instrumental to the visualization of liquid crystal orientation on photoalignment films at the early and the late stages of dimerization. Furthermore, the observed crossover in liquid crystal orientation was successfully interpreted by considering three factors: the relative abundance of coumarin dimers to monomers, their orientational order parameters, and the energetics of molecular interaction.

Citation Download Citation

Chunki Kim, Anita Trajkovska, Jason U. Wallace, and Shaw H. Chen "Quantitative analysis of photoalignment of liquid crystals on coumarin-containing polymer films", Proc. SPIE 6332, Liquid Crystals X, 633201 (7 September 2006); https://doi.org/10.1117/12.680029

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