标题: | 含香豆素碟状分子之合成及其在液晶光配向膜上之应用 Synthesis of Discotic Compounds Containing Coumarin Side Groups for the Applications of Liquid Crystal Photo-Alignment Layers |
作者: | 骆世杰 Shr-Jie Luo 许千树 Chain-Shu Hsu 应用化学系硕博士班 |
关键字: | 香豆素, 碟状分子, 光配向膜;coumarin, discotic compound, photo-alignment layer |
公开日期: | 2001 |
摘要: | 本研究主要目的是合成含有香豆素感光基团于侧链的碟状分子(1M),并探讨其在液晶光配向膜上的应用性。为了探讨不同的感光基团对液晶配向性质、感光性和热稳定性的影响,本研究并比较三种侧链分别含有香豆素、丙烯酸酯和环氧基不同感光基团的碟状分子。三种单体以旋转涂布法制成膜,经由线性偏极化紫外光 (LPUV) 照射后,都可以产生排列液晶的能力。 单体1M在照光聚合过程当中,利用紫外可见光光谱分析,证实其只进行 (2 + 2) 环化加成反应。经由低能量LPUV照射下,诱导液晶分子排列的方向是平行于LPUV偏极化的方向,而且在相同曝光强度下,单体1M仅需要2.4 J/cm2的曝光能量就可以达到均匀排列液晶分子的效果,远比需要较多曝光能量的感光基团丙烯酸酯或环氧基来的省时。利用单体1M配向之液晶盒具有相当高的热稳定性,其经由160℃高温下测试不会有所改变。此外,利用一次倾斜曝光能够在1M光配向膜上产生小预倾角。由于单体1M具有感光性高、溶解性好且不需要摩擦定向的优点,将有潜力应用在制备薄膜电晶体驱动的多区域液晶显示器上。 The goal of this study is to synthesize a discotic compound (1M) containing coumarin side group for the application of liquid crystal photo-alignment materials. The monomer 1M was also compared with two discotic monomers which containing acrylate and epoxy side groups based on their alignment capability, photosensitivity and device thermal stability. Three monomers were spin coated on the ITO glass substrates and irradiated with linearly polarized UV (LPUV) light. All three monomers showed the photo-alignment capability. The UV-visible spectra verified that monomer 1M underwent 2 + 2 photodimerization during the UV exposure. The LC alignment direction is parallel to the polarization axis of LPUV. The alignment was achieved when the LPUV exposure energy was higher than 2.4 J/cm2. The required exposure energy of monomer 1M was much lower than that of monomers 2M and 3M. It can save processing time in LCD manufacture. The uniform alignment was remained even when the temperature was raised to 160℃. A small pretilt angle was generated when the monomer 1M film was irradiated with single oblique exposure of LPUV light. The monomer 1M with high photosensitivity, good solubility in common organic solvent, has potential application for the multi-domains TFT-LCD devices. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#NT900500001 http://hdl.handle.net/11536/69228 |
显示于类别: | Thesis |