| 研究生: |
黃俊昇 Huang, Chun-Sheng |
|---|---|
| 論文名稱: |
吡嗪、吡啶和哌嗪雙性衍生物做為封裝材料中潛含性觸媒之研究 Amphiphatic Pyrazine, Pyridine and Piperazine Derivaties as the Thermal Latency for Epoxy-Phenolic Resins |
| 指導教授: |
葉茂榮
Yeh, Mou-Yung |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2008 |
| 畢業學年度: | 96 |
| 語文別: | 中文 |
| 論文頁數: | 91 |
| 中文關鍵詞: | 雙性觸媒 、潛含性觸媒 、吡啶 、哌嗪 、吡嗪 、環氧樹脂 |
| 外文關鍵詞: | thermal latent catalysts, amphiphatic catalysts, pyridine, piperazine, pyrazine, epoxy-phenolic resins |
| 相關次數: | 點閱:82 下載:6 |
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以有機羧酸官能基修飾的pyrazine(吡嗪)、pyridine(吡啶)、piperazine(哌嗪)衍生物,具有酸鹼兩種特性,故此系列雙性分子18-23經評估可作為促使DGEBA (Diglycidylether of bisphenol A)環氧樹脂高分子化的有機共軛酸鹼型潛含性觸媒,可用於誘導樹脂的交聯聚合反應,並加以探討觸媒於環氧樹脂中的熱潛含性及儲存性。本實驗探討的結果和陽離子型的熱潛含性觸媒BHP (3,N-benzylpyrazinium hexafluoroantimonate)加以比較,由黏度測試証明有機羧酸官能基修飾的pyrazine、pyridine、piperazine衍生物做為潛含性觸媒具有較佳的儲存時間,從活化能以及黏度測試一致性的結果得知觸媒潛含性大小為piperazine-2-carboxylic acid (22) > 3-aminopyrazine-2-carboxylic acid (20) > 3-piperazin-1-yl-propionic acid (23) > 2-pyrazinecarboxylic acid (18) > picolinic acid (21) > 2,3-pyrazinedicarboxylic acid (19)。比較陽離子型潛含性觸媒BPH的物理特性,如活化能,放熱值及黏度儲存時間得知2-pyrazinecarboxylic acid (18), piperazine-2-carboxylic acid (22), and 3-piperazin-1-yl-propionic acid (23)對促使DGEBA環氧樹脂高分子化為較佳的潛含性觸媒,此外,由轉化率的結果得知觸媒3、18、19、20可在特定的小溫度區間快速誘導樹脂進行交聯聚合反應,使用雙性的pyrazine(吡嗪)、pyridine(吡啶)、以及 piperazine(哌嗪)的羧酸衍生物做為觸媒,催化使環氧樹脂硬化後之玻璃轉移溫度(Tg)介於52-82 °C 之間,其中觸媒3-aminopyrazine-2-carboxylic acid (20) 催化交聯後樹脂的玻璃轉移溫度為82 °C與BHP (3,N-benzylpyrazinium hexafluoroantimonate) 催化交聯後樹脂的玻璃轉移溫度85 °C較為相近。
Novel amphiphatic piperazine, pyrazine, and pyridine compounds were evaluated as thermal latent catalysts for the polymerization of diglycidyl ether of bisphenol A (DGEBA). Amphiphatic piperazine, pyrazine, and pyridine compounds 18-23 were used to cure epoxy resin systems to investigate their thermal latency and storage stability. Cationic latent thermal BHP (3, N-benzylpyrazinium hexafluoroantimonate) was investigated as model reaction of epoxy resin systems with respect to the thermal latency and storage stability of the amphiphatic piperazine, pyrazine, and pyridine derivatives catalysts. To characterize the viscosity-storage time, amphiphatic piperazine, pyrazine, and pyridine compounds were indicated to exhibit good toexcellent latency properties at room temperature. Results from the cure activation energy and the viscosity-storage time of the catalysts, the order of thermally latent activity was piperazine-2-carboxylic acid (22) > 3-aminopyrazine-2-carboxylic acid (20) > 3-piperazin-1-yl-propionic acid (23) > 2-pyrazinecarboxylic acid (18) > picolinic acid (21) > 2,3-pyrazinedicarboxylic acid (19). In comparison of physical properties including the cure activation energy, exothermic heats and viscosity-storage time with cationic latent catalyst N-benzylpyrazinium hexafluoroantimonate (BPH, 3) as the standard compounds, 2-pyrazinecarboxylic acid (18), piperazine-2-carboxylic acid (22), and 3-piperazin-1-yl-propionic acid (23) revealed better the curing reactivity and the thermal latency for polymerization of epoxy resin. From the conversions results, catalysts 3,18-20 rapidly rose at specific and narrow temperature ranges. Concerning the glass transition temperature (Tg), the use of amphiphatic pyrazine, pyridine, and piperazine catalysts 18-23 indicate that complete or near complete curing systems were obtained in the range of about 52-82 °C, 3-aminopyrazine-2-carboxylic acid (82 °C, 20) was similar to N-benzylpyrazinium hexafluoroantimonate (85 °C, 3, BHP).
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