Alignment Change of Triphenylene Derivative Discotic Liquid Crystal with Polymerizable Functional Groups by Infrared Laser Irradiation

Abstract

A triphenylene derivative possessed polymerizable functional groups was investigated on the alignment change by the polarized infrared laser irradiation. This derivative shows a Colh mesophase. The microscopic texture of the Colh mesophase shows a spontaneous homeotropic alignment between two BaF2 substrates. When the polarized infrared light at 1616cm-1 corresponding to the C-C stretching vibrations of triphenylene core was irradiated, the microscopic texture was changed in the irradiated region. On the other hand, in the irradiation with the polarized infrared light at 1712cm-1 at which wavenumber any absorption takes place, no microscopic texture change was caused. It was found that the alignment control of the Colh phase of the triphenylene derivative possessed polymerizable functional.