- 學位論文
熱向性液晶高分子/蒙托土奈米複合材料之合成製備
Synthesis and preparation of the novel thermotropic liquid crystalline polymer/montmorillonite nanocomposite
摘要
主鏈型液晶高分子(Main Chain Liquid Crystal Polymers, MCLCPs)具有獨特的性質，如高強度、高剛硬性、耐高溫、耐化學藥品及耐磨耗等，加上液晶高分子在液晶態時的加工便利性，因此主鏈型液晶高分子近年來已成為工業上相當重要的塑膠之ㄧ。相較於傳統液晶高分子使用熔融聚合法進行合成，本研究期望針對其單體特性利用溶液聚合方式，能以較簡單的製程方式合成出性質優異的新型液晶高分子。本實驗分別利用Terephthalic aldehyde與terephthalic acid, 另外亦使用Hydroquinone與Terephthalic acid此兩種不同組合的單體利用溶液縮合聚合的方式合成新型熱向性液晶高分子，實驗將針對時間、溫度、縮合劑等變因進行探討，找出最佳化的反應條件，並利用相同條件，以層間縮合聚合的方式進一步製備液晶高分子/蒙托土奈米複合材料(LCP/Clay Nanocomposites)，產物以紅外線光譜(FT-IR)以及核磁共振儀(NMR)進行結構鑑定，再輔以熱重分析儀(TGA)與微差掃瞄卡計(DSC)進行熱性質分析，利用X光粉末繞射分析儀(XRD)來觀察液晶高分子之結晶性並計算蒙托土之層間距離，最後將使用穿透式電子顯微鏡(TEM)觀察蒙托土在材料中之分散程度。
並列摘要
Main chain liquid crystal polymers (MCLCPs) was one of the most important industrial polymers in the recent years. MCLCPs has some exceptional properties, such as high strength, stiffness, thermal stability, good chemical resistance and well working properties in the liquid crystal phase. In this investigation, one of the novel MCLCPs was synthesized by using terephthalic aldehyde, and terephthalic acid; the another one was prepared by using hydroquinone and terephthalic acid with solution condensation polymerization with more simple process. The best condition in this study was discussed from different reaction time, temperature and condensation agent. Additionally, the MCLCPs/Clay nanocomposites are prepared by in-situ condensation polymerization in the same condition. The products were characterized by Fourier-transfer Infrared (FT-IR) and nuclear magnetic resonance (NMR).The thermal properties were determined by using thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). Finally, the dispersion of clay in the nanocomposites was determined by X-ray diffraction (XRD) and transmission electron micrograph (TEM).
參考文獻
延伸閱讀
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