Photoinduced alignment of LC polymers by the combination of photo-orientation and thermotropic self-organization

Joachim Stumpe; Thomas Fischer; Michael Rutloh; Regina Rosenhauer; Johann Georg Meier

doi:10.1117/12.365801

14 October 1999 Photoinduced alignment of LC polymers by the combination of photo-orientation and thermotropic self-organization

Joachim Stumpe, Thomas Fischer, Michael Rutloh, Regina Rosenhauer, Johann Georg Meier

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Proceedings Volume 3800, Liquid Crystals III; (1999) https://doi.org/10.1117/12.365801
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

The irradiation with linearly polarized light generates optical anisotropy in isotropic films of photochromic amorphous and liquid crystalline polymers due to photoorientation. The photochemically induced orientation of the photochromic side groups causes a co-operative orientation of the non-photochromic parts of the polymers such as the non-photochromic side groups. The orientational order photogenerated in the glassy state acts as an initializing force to align LC polymers by thermotropic self-organization on annealing above Tg. The combination of both ordering principles can result in a significant amplification of the light-induced in-plane anisotropy or, results alternatively in a homeotropic alignment of the side groups. The dependence of the photoorientation process and its thermal amplification on the liquid crystallinity, aggregation and the irradiation conditions is discussed.

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Joachim Stumpe, Thomas Fischer, Michael Rutloh, Regina Rosenhauer, and Johann Georg Meier "Photoinduced alignment of LC polymers by the combination of photo-orientation and thermotropic self-organization", Proc. SPIE 3800, Liquid Crystals III, (14 October 1999); https://doi.org/10.1117/12.365801

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