Photoinduced orientation in poly(vinylcinnamate) and poly(7-methacryloyloxycoumarin) thin films and the consequences on liquid crystal alignment |
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| Authors: | Sebastien Perny Pierre Le Barny Jacques Delaire Thierry Buffeteau Claude Sourisseau Ivan Dozov |
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| Affiliation: | 1. Department of Chemistry , Kent State University , Kent, OH, 44242-0001, USA aseed@kent.edu;3. Department of Chemistry , Kent State University , Kent, OH, 44242-0001, USA |
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| Abstract: | Thin films of poly(vinylcinnamate) and poly(7-methacryloyloxycoumarin) have been exposed to linearly polarized UV light. The resulting anisotropic films have been characterized by using UV, conventional and polarization modulation FTIR spectroscopies. In particular, several internal vibrational modes have been used as structural probes to examine the orientation of groups in the irradiated polymers. These experiments provide new information about the photoinduced anisotropy in these photocrosslinkable polymers upon irradiation with linearly polarized UV light, and an orientation mechanism is proposed. This mechanism is confirmed by studying the liquid crystal alignment induced by PVCi and poly(7-methacryloyloxycoumarin). Finally, the stability of the photoalignment process is discussed. |
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| Keywords: | alkysulphanyl isothiocyanate naphthalene high polarizability |
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