Photoalignment of monodisperse glassy-nematic oligofluorenes

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

doi:10.1117/12.734852

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12 September 2007 Photoalignment of monodisperse glassy-nematic oligofluorenes

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

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Proceedings Volume 6654, Liquid Crystals XI; 665409 (2007) https://doi.org/10.1117/12.734852
Event: Photonic Devices + Applications, 2007, San Diego, California, United States

Abstract

The photoalignment of a series of monodisperse glassy-nematic oligofluorenes was investigated on coumarin-containing polymer films in the parallel regime. The orientational order parameter of a spin-cast oligofluorene film, S_OF, was found to decrease with an increasing oligofluorene length because of the increasing demand on Y_dS_d, the product of coumarin dimers' concentration and orientation order parameter. In addition, an increased annealing temperature demanded by a longer oligofluorene caused an orientational relaxation of coumarin dimers to a greater extent. Nonetheless, under favorable conditions S_OF values of penta, hepta-, and nonafluorenes are comparable to those achieved on rubbed polyimide films.

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Anita Trajkovska, Chunki Kim, Jason U. Wallace, and Shaw H. Chen "Photoalignment of monodisperse glassy-nematic oligofluorenes", Proc. SPIE 6654, Liquid Crystals XI, 665409 (12 September 2007); https://doi.org/10.1117/12.734852

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