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Photo-Alignment Mechanism Study of Poly(siloxane cinnamate)  

Choi Ji-Won (Materials Research Center for Information Display Department of Chemical Engineering, Kyung Hee University)
Lim Ji-Chul (Materials Research Center for Information Display Department of Chemical Engineering, Kyung Hee University)
Song Ki-Gook (Materials Research Center for Information Display Department of Chemical Engineering, Kyung Hee University)
Publication Information
Polymer(Korea) / v.30, no.5, 2006 , pp. 417-421 More about this Journal
Abstract
Photo -alignment of poly (siloxane cinnamate) (PSCN) was studied to better understand the alignment mechanism of cynnamoyl groups under various process conditions. DSC and polarized microscope studies showed that the isotropic temperature oi PSCN was about $105^{\circ}C$ and the liquid crystallinity, once formed, did not completely disappear even when the temperature went into the isotropic regions. UV/Vis absorption study suggested that the photo - dimerization was the main photo alignment mechanism and it's efficiency could be enhanced through the self-alignment of PSCN. It was also found that photo-dimerization was in competition with photo-fries reaction and the photo- alignment of PSCN was interfered with the excessive UV because of the strong photo-fries reaction. However, photo - fries reaction could be suppressed by adjusting the UV wavelength.
Keywords
liquid crystal, photo-alignment; photo-dimerization; poly (vinyl cinnamate); poly(siloxane cinnamate);
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