采用均苯四甲酸二酐(PMDA)、4,4'-二胺基二苯甲烷(MDA)以及侧基含联苯和己基的二胺(TBCA)三元共聚制备了聚酰亚胺垂直取向剂,摩擦前后得到相同的垂直取向效果,探讨了侧链二胺TBCA的含量对聚酰亚胺取向膜垂直取向性能的影响,采用衰减全反射红外光谱(ATR-FTIR)对摩擦前后聚酰亚胺膜表面侧链的相对含量进行了对比,并运用原子力显微镜(AFM)考察了表面细微沟纹对液晶分子取向的影响.结果表明,在取向膜未经摩擦没有产生表面沟纹的情况下液晶分子也能取向,并且这类取向膜表面侧链的含量与摩擦后的含量相当.
参考文献
| [1] | 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(12):6913-6917. |
| [2] | 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(1):263-264. |
| [3] | Lee J B,Lee H K,Park J C,et al.The structural effects on the pretilt angle of alignment materials with alkylcyelohexylbenzene as a side chain in polyimides[J].Mol.Cryst.Liq.Cryst.,2005,439:161-172. |
| [4] | David H,Wang Z H,Shen M M.et al.Synthesis and properties of polyimides containing multiple alkyl side chains[J].Macromolecules,2007,40(4):889-900. |
| [5] | Arafune R,Sakamoto K,Ushioda S.Importance of rubbing-induced inclination of polyimide backbone structures for determination of the pretilt angle of liquid crystals[J].Phys.Rev.E,1998,58(5):5914-5918. |
| [6] | Lee K W,Pack S H,Lien A,et al.Microscopic molecule reorientation of alignment layer polymer surfaces induced by rubbing and its effects on LC pretilt angles[J].Macromolecules,1996,29(27):8894-8899. |
| [7] | Hahm S G,Lee T J,Chang T H,et al.Unusual alignment of liquid crystals on rubbed films of polyimides with fluorenyl side groups[J].Macrornolecules,2006,39(16):5385-5392. |
| [8] | 见山幸广,仁平贵康,远藤秀幸,等.液晶取向处理剂和用该处理剂的液晶元件以及液晶的取向方法:中国,ZL99811111.2[P].2001-10-24. |
| [9] | Liu Z J,Yu F F,Zhang Q,et al.Preparation and characterization of a novel polyimide liquid crystal vertical alignment layer[J].Eur.Polym.J.,2008,44(8).2718-2727. |
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