Synthesis, Characterization, and Liquid Crystal Alignment Properties of Photosensitive Polyimide

被引：6
作者：
Kim, Yu Hyun
Min, Young Hoon
Lee, Seung Woo [1 ]
机构：
[1] Yeungnam Univ, Sch Display & Chem Engn, Kyongsan 712749, South Korea
来源：
MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 2009年 / 513卷
关键词：
alignment layer; cinnamate chromophore; LCD; linearly polarized UV light; nematic liquid-crystal; photosensitive polyimide; polyimide; MOLECULAR-REORIENTATION; PHOTOREACTIVE POLYIMIDE; AROMATIC POLYIMIDES; SIDE-CHAINS; FILMS; SURFACES; BEARING;
D O I：
10.1080/15421400903195700
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A photoreactive polyimide, bearing a cinnamate photoreactive moiety in its side group, was synthesized. The photochemical reactions of the PSPI in the films were investigated in detail by UV-Vis and IR spectroscopies; the cinnamate chromophores were confirmed to undergo photodimerization. Linearly polarized ultra-violet light irradiation induced anisotropic reorientations of both the polymer main chains and the side groups in the film. The PSPI thin films were found to have unidirectional orientation ability as a result of photo-exposure with linearly polarized ultraviolet light, with the photoaligned polymer chains in the PSPI films able to effectively induce the alignment of nematic liquid crystals.
引用
收藏
页码：89 / 97
页数：9
相关论文
共 17 条
[1]   Photo- and rubbing-alignable brush polyimides bearing three different chromophores [J].
Hahm, Suk Gyu ;
Lee, Taek Joon ;
Ree, Moonhor .
ADVANCED FUNCTIONAL MATERIALS, 2007, 17 (08) :1359-1370
[2]  
Hasegawa M., 1995, J PHOTOPOLYM SCI TEC, V8, P241
[3]   Photoreactivity of polymers with regioisomeric cinnamate side chains and their ability to regulate liquid crystal alignment [J].
Ichimura, K ;
Akita, Y ;
Akiyama, H ;
Kudo, K ;
Hayashi, Y .
MACROMOLECULES, 1997, 30 (04) :903-911
[4]   Study of local stress, morphology, and liquid-crystal alignment on buffed polyimide surfaces [J].
Kikuchi, H ;
Logan, JA ;
Yoon, DY .
JOURNAL OF APPLIED PHYSICS, 1996, 79 (09) :6811-6817
[5]  
Kim SI, 1999, J POLYM SCI POL CHEM, V37, P2909, DOI 10.1002/(SICI)1099-0518(19990801)37:15<2909::AID-POLA24>3.0.CO
[6]  
2-B
[7]   Microscopic molecular reorientation of alignment layer polymer surfaces induced by rubbing and its effects on LC pretilt angles [J].
Lee, KW ;
Paek, SH ;
Lien, A ;
Durning, C ;
Fukuro, H .
MACROMOLECULES, 1996, 29 (27) :8894-8899
[8]   Role of the n-alkyl end of bristles in governing liquid crystal alignment at rubbed films of brush polymer rods [J].
Lee, SW ;
Lee, SJ ;
Hahm, SG ;
Lee, TJ ;
Lee, B ;
Chae, B ;
Kim, SB ;
Jung, JC ;
Zin, WC ;
Sohn, BH ;
Ree, M .
MACROMOLECULES, 2005, 38 (10) :4331-4338
[9]   A soluble photoreactive polyimide bearing the coumarin chromophore in the side group: Photoreaction, photoinduced molecular reorientation, and liquid-crystal alignability in thin films [J].
Lee, SW ;
Kim, SI ;
Lee, B ;
Kim, HC ;
Chang, TY ;
Ree, M .
LANGMUIR, 2003, 19 (24) :10381-10389
[10]   Photoreactions and photoinduced molecular orientations of films of a photoreactive polyimide and their alignment of liquid crystals [J].
Lee, SW ;
Kim, SI ;
Lee, B ;
Choi, WY ;
Chae, B ;
Kim, SB ;
Ree, M .
MACROMOLECULES, 2003, 36 (17) :6527-6536
12