虽然传统的平行取向技术已广泛应用于液晶显示器的生产,但其存在窄视角、低对比度和慢响应时间等问题,因此液晶分子的垂直取向技术在国外已经被广泛研究.在实验中,一种含有液晶结构侧链的聚酰亚胺通过均苯四羧酸二酐 (PMDA),4,4'-二胺基二苯甲烷(MDA)和4-己氧基联苯酚-3',5'-二胺基苯甲酸酯(C6BBDA,实验室自制)共聚被制备,并且被用作液晶取向膜,研究其取向性能.试验发现,该种聚酰亚胺作为取向膜可以诱导液晶分子垂直取向,即使在摩擦之后依然可以获得大于89 °的预倾角;使用正交偏光显微镜观察所制得液晶盒中的液晶取向效果,发现垂直取向均匀良好;为了测试该垂直取向的热稳定性,将制备的液晶盒在120 ℃下烘烤12 h后,偏光显微镜下观察发现垂直取向仍然良好均匀,表明该取向膜具有良好的热稳定性.
参考文献
| [1] | 孙自淑,江天,马家举,等.聚酰亚胺的改性及应用进展[J].化工科技,2005,13(5):54-58. |
| [2] | 魏怀鹏,李艳龙,叶文江,等.聚酰亚胺静电损伤和取向作用失效的系统观测[J].液晶与显示,2006,21(4):314-319. |
| [3] | 丁孟贤,何天白.聚酰亚胺新型材料[M].北京:化学工业出版社,1998:142. |
| [4] | Cai C,Lien A,Andry P S,et al.Dry vertical alignment method for multi-domain homeotropic thin-film-transistor liquid crystal displays[J].Jpn.J.Appl.Phys.,2001,40(9B):6913-6917. |
| [5] | 张伶莉,姚丽双,费春红,等.一种新型液晶垂直取向膜[J].液晶与显示,2006,21(5):456-459. |
| [6] | Hwang J Y,Seo D S,Kim J H.Wide viewing angle of nematic liquid crystal using the vertical-alignment-1/6 pi cell on a rubbed polyimide surfaces[J].Jpn.J.Appl.Phys.,2001,40(Part 1):263-264. |
| [7] | Lee Y J,Choi J G,Oh J M,et al.Effect of side chain structure of polyimides on a pretilt angle of liquid crystal cells[J].Polymer,2006,47(3):1555-1562. |
| [8] | Lee S B,Shin G J,Chi J H,et al.Synthesis,characterization and liquid-crystal-aligning properties of novel aromatic polypyromellitimides bearing (n-alkyloxy)biphenyloxy side chains[J].Polymer,2006,47(11):6606-6621. |
| [9] | Lee J B,Lee H K,Park J C,et al.The structural effects on the pretilt angle of alignment materials with alkylcyclohexylbenzene as a side chain in polyimides[J].Mol.Cryst.Liq.Cryst.,2005,439(8):2027-2038. |
| [10] | Seo D S,Kobayashi S,Nishikawa M.Study of the pretilt angle for 5CB on rubbed polyimide films containing trifluoromethyl moiety and analysis of the surface atomic concentration of F/C(%) with an electron spectroscope for chemical analysis[J].Appl.Phys.Lett.,1992,61(7):2392-2394. |
| [11] | 张伶莉,姚丽双,宣丽,等.一种新型液晶垂直取向膜[J].液晶与显示,2006,21(5):456-459. |
| [12] | Liu X K,Xiang H,Yang J,et al.Preparation and properties of novel polyimides with side chains containing biphenyl units[J].J.Appl.Polym.Sci.,2003,90(8):3291-3298. |
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