本實驗合成兩成份(P1, P5)及三成份(P2~P4 和P6~P8)的新穎性側鏈型膽固醇型液晶共聚高分子，分別具有不同的光致變性基團(N=N 或 C=C)，以探討溫度效應及UV 光對高分子在選擇性光反射波段的影響，並且探討側邊取代基對熱性質以及分子間引力的影響。本研究所合成的一系列液晶高分子，以不同組成，在相同的條件下，以自由基聚合法聚合而成，均以FT-IR、1H-NMR、EA 鑑定分子結構，DSC、TGA、UV-Vis、GPC、X-ray 和POM 分析聚合物之耐熱性及光學性質。所合成的高分子重量平均分子量約為7.0 x 103 and 1.5 x 104 gmol-1，而10 wt % 熱重損失皆可高達到300 oC 以上，具有良好的耐熱性質。本研究中，膽固醇型液晶高分子升高溫度皆會導致反射光波長藍位移，其中P1 為光敏感性物質，反射波長轉移量隨著溫度而改變，可以開發作為溫度感測器的材料，然而當P1 的光學活性共聚單體苯環側邊多導入一個氯，由於降低分子之對稱性，可降低液晶高分子的液晶相溫度和降低溫度效應對反射波長的影響，在P5 的液晶相溫度範圍內，選擇性光反射的波長被侷限在400nm~450nm 範圍。光致變特性及其他高分子的熱性質在本論文中皆有詳細的探討。本研究所合成的膽固醇液晶高分子在溫度感測器及記錄材料應用上，均為一具有前瞻性的材料。

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.

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