Synthesis and Optical Behaviors of Novel Ternary Liquid Crystalline Copolymers

• Main Authors: Yen-Ling Chou, 周彥伶
• Other Authors: Jui-Hsiang Liu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/76572301030679792974

碩士 === 國立成功大學 === 化學工程學系碩博士班 === 96 === In order to investigate the effect of temperature and UV irradiation on the reflective band of cholesteric liquid crystals, a series of novel side chain liquid crystalline binary (P1 and P5) and ternary (P2~P4 and P6~P8) polymers consisting of one (N=N or C=C) or dual (N=N and C=C) photochromic segments were synthesized and characterized considering their liquid crystalline, optical, and photochromic properties and their thermal stability. Monomers were polymerized with various feed compositions under the same conditions. The synthesized polymers, P1-P8, were identified using FT-IR, NMR, and EA. Thermal and optical properties were estimated using DSC, TGA, XRD, and POM instruments. Molecular weight of polymers was calculated to be between 7.0 x 103 and 1.5 x 104. Thermal resistance was found to be higher than 300oC. An increase of temperature was found to cause a blue shift of reflective band. Polymer P1 revealed highly thermal sensitivity. It is expected to be used as a thermal sensor. Contrary to that, introduction of a chlorine atom onto benzene ring of liquid crystal molecule reduced hermal sensitivity of polymer’s reflective band. For polymer P5, variation of the reflective band was limited between 400 and 450 nm. Polymers synthesized in this investigation are expected to be used as novel materials in the field of thermal sensing and color image recording techniques.