화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.368, 4191-4198, 2001
Alignment of photo-cross-linkable copolymer liquid crystals induced by linearly polarized UV irradiation and thermal treatment
This paper describes the photoinduced thermal orientation of the photo-cross-linkable methacrylate copolymer liquid crystal (CPLC) film comprising a photoreactive 6-[4-(2-cinnamoyloxyethoxy)biphenytoxy]hexyl side group and a photoinactive n-(4-cyanobiphenyloxy)alkyl (nCB, n=5, 6, 9, 10) side group by the use of linearly polarized ultraviolet (LPUV) light irradiation followed by annealing. The orientational behavior of the mesogenic groups was greatly dependent on the number of the spacer length n and a heating condition. When the n was 6 or 10, the in-plane alignment of the mesogenic groups was the major component. while the out-of-plane alignment was prevalent when the n was 5 or 9. In addition, the orientational behavior was also affected for Ib and le (n=5, 9) by the heating rate after the LPUV light irradiation at room temperature.