Synthesis of Dendrimers and Dendrons,and Characterization of Liquid Crystalline Phases.

[[abstract]]本論文以二辛胺 (di-octylamine) 為末端官能基，使用不同的中心核如乙二胺 (di-aminoethane)、丙二胺 (di-aminopropane)、丁二胺 (di-aminobutane)、戊二胺 (di-aminopantane)、N,N’-二甲基乙二胺 (N,N’-dimethylethylenediamine) 及N,N’-二甲基-1,4-丁二胺 (N,N’-2-methyl-1,4-butanediamine) 來合成樹枝狀分子，另外用?啶 (piperidine)、碼碄 (mopholine) 合成了半樹枝狀分子，並以偏光顯微鏡、熱微差掃描分析儀、及粉末 X-ray繞射來進行研究。 實驗結果顯示中心核主碳鏈為奇數時，能破壞樹枝狀分子的對稱性而存在一定溫度範圍之柱狀液晶相，偶數碳鏈中心核之樹狀分子則沒有中間相的存在，但此中心核甲基化之後也能破壞原本的對稱性而產生液晶相，另外半樹狀分子具有液晶相但範圍不大。 最後一部份以四氰基乙烯 (TCNE) 混入無液晶相或液晶相範圍不大的樣品後也有助於分子的排列更鬆散，促使液晶相的生成及擴大。[[abstract]]Title of thesis：Synthesis of Dendrimers and Dendrons, and Characterizaion of Liquid Crystalline Phases Name of Institute：Department of Applied Chemistry, National Chi Nan University Page：108 Graduation Time：01/2013 Conferred：Master Student Name：Jie-Wei Shieh Advisor name：Dr. Long-Li Lai Abstract In this project, di-octylaimne as the terminal functional group. We use different cores such as di-aminoethane, di-aminopropane, di-aminobutane, di-aminopantane N,N’-dimethylethylenediamine and N,N’-2-methyl-1,4-butanediamine for preparing dendrimers. Besides, piperidine and mopholine were used for preparing dendrons. Dendrimers and dendrons were characterized by polarizing microscopy, differential scanning calorimetry and powder XRD. The results showed main chain has odd atoms of core can breaking symmetry and display columnar liquid-crystalline phases during thermal treatment. It didn’t existed mesophase of core which has even atoms of main chain. In addition, dendrons displayed short range of liquid-crystalline phase during thermal treatment. The last parts of experiment, by mixing TCNE to denderimers and dendrons can inducing or expanding of liquid-crystalline phase.[[note]]碩