Abstract—The side chain photopolymer containing terminally substituted meth oxy cinnamoyl ester was synthesized and characterized. The para position in the methoxy cinnamoyl group was connected with polymer backbone through 4 numbers of methylene spacer. A good thermal stability of photopolymer was measured by thermo gravimatric analysis (TGA) measurement until 400 ℃ while the glass transition temperature was observed that high PMC according to the results of differential scanning calorimetry (DSC). The nematic liquid crystal (NLC) pretilt angle generated was about 0.06-1.66 by polarized different UV exposure energy. Especially, the low pretilt angle of the NLC was measured by the longer polarized UV exposure time. This result indicated that the NLC pretilt angle generated sensitively depends on the UV exposure time on the photopolymer layer.
Index Terms—Cinnamate, liquid crystals, thermal properties, photoisomerization, pretilt angle
The authors are with the IT Convergence material R&D Group, Korea Institute of Industrial Technology (KITECH), 35-3, Hongcheon-ri, Ipjang-myeon, Seobuk-gu, Cheonan 331-825, South Korea (e-mail:firstname.lastname@example.org.)
Cite: Si Yeol Yang, Ju Hui Kang, Seung Yong Jeong, Sangkug Lee, Kyung Ho Choi, and Gyo jic Shin, "Photo alignment Behaviors of Photopolymer with Cinnamate Group by LPUV Method," International Journal of Engineering and Technology vol. 4, no. 4, pp.376-378, 2012.