液晶光電材料之合成及物性研究

Synthesis and Study of The Liquid Crystal Materials and Optoelectronic Materials.

曹紘瑞(Hung-Ray Tsao)

指導教授 ： 廖義田

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2006年)

摘要

本研究分成兩個部分，第一部分為合成鐵電性液晶及膽固醇液晶，以FTIR (傅立葉轉換紅外線光譜)及 1H-NMR來鑑定化合物的結構，並以POM (偏光顯微鏡)觀察其液晶特有的光學紋路，用DSC來觀察矽氧烷類液晶的液晶相的熱轉移溫度並利用偏光-衰減全反射-傅立葉轉換紅外線光譜儀 (Polarization Modulation-Attenuated Total Reflection – Flourier Transform Infrared)來探討矽氧烷類液晶分子的三度空間排列。
第二部分採用光誘導配向的方式，將偶氮苯與PI(polyimide)結合，再利用偏極化紫外光曝光使其產生順-反異構化反應，再用polarized-ATR-FTIR研究其三度空間之分子排列，做為未來顯示器配向膜的參考。再以Cinnamoyl chloride與PI結合利用偏極化紫外光曝光使其產生光二聚體化，讓分子重新排列形成液晶之配向膜，最後用polarized-ATR-FTIR研究其三度空間之分子排列。

關鍵字

膽固醇液晶 ； 鐵電性液晶 ； 光二聚體化反應 ； 順-反異構化反應 ； 偏光-衰減全反射-傅立葉轉換紅外線光譜儀

並列摘要

First, a series of liquid crystal polymers with different amounts of cholesterol mesogens and ferroelectric property are synthesized in this research. The structures of the compound synthesized are confirmed by IR and 1H-NMR spectroscopy. The thermal properties are characterized by DSC, POM (Polarized Optical Microscopy). In this research, the 3-D molecular arrangement of molecular were measured by Polarization Modulation-Attenuated Total Reflection-Flourier Transform Infrared spectroscopy (PM-ATR-FTIR).
Second, we discuss two materials which are cinnamoyl chloride and azobenzene. The cinnamoyl chloride can induce the photo-dimerization reaction under linear-polarized UV light. Similarly, azobenzene can induce the cis-trans photoisomerization under UV light. This research try to investigate the two materials which are chemically bonded to polyimide. The arrangement of the two materials are studied by Polarization Modulation-Attenuated Total Reflection-Flourier Transform Infrared spectroscopy (PM-ATR-FTIR).

並列關鍵字

Cholesteric liquid crystals ； FTIR-ATR ； cis-trans photoisomerization ； photo-dimerization

參考文獻

[1] Shin'ya Morino , Aki Kaiho,and Kunihiro Ichimura , "Three-dimensional Orientation Photocontrol of Liquid-Crystalline Molecules in Photoresponsive Polymer Networks" , Chemistry Letters , p711∼712 , 1999 .

[2] Masaru Nakagawa , Shin'ya Morino , and Kunihiro Ichimura , "Photogeneration of pretilt angles of nematic liquid crystals by azobenzene-containing monolayers on poly(acrylic acid) films" , Journal of Materials Chemistry , p833∼837 , 1999 .

[5] D. Demus, J. Goodby, G. W. Gray, H. –W. Spiess, V. Vill, Handbook of Liquid Crystals

[6] G. W. Gray, J. W. Goodby, Smectic Liquid Crystals-textures and structures, Leonard Hill, London, (1984).

[7] P. G. de Gennes and J. Prost, The Physics of Liquid Crystals, 2nd ed., Clarendon Press, Oxford, (1993)