摘要
以Dow Chemical公司生產之阻燃層DC93-104探討其耐燒蝕特性及評估其相關物性，此材料以矽基橡膠（共聚矽氧烷）為基材，搭配二氧化矽、碳化矽及碳纖維。以電腦模擬軟體Synthia®預估基材之性質隨其組成的變化，發現聚甲基苯基矽氧烷較聚二甲基矽氧烷有利於提昇基材之比熱與表面自由能，及降低熱傳導係數，如此不但可提升基材之熱阻效果，亦可改善其與鋼殼間之接合強度，但缺點是會造成比重略增。DC93-104經常壓高溫（900℃）後會形成一層緻密與堅硬之表層，而且會有些許的裂痕產生。此緻密且堅硬表層級內部經化學分析電子光譜儀（ESCA）分析後發現表層之主要成分為SiO2及碳黑，而內部因有裂解的現象產生，進而有RSi（-O3）及R3Si（-O1）之結構式的形成，且由中心部份以RSi（-O2）居多看來，可發現其有效之阻燃效果。經不同壓力受熱（9.8、19.6與29.4 bar，550℃）後DC93-104，經ESCA分析結果發現，高壓能有效抑制或減緩環化裂解反應的發生。由於受熱中DC93-104會產生大量的煙霧，此煙霧經凝結會形成類似油性之液體。恆溫在150、300與450℃下將收集得到的液體，藉由傅利葉轉換紅外線光譜儀（FTIR）與氣相層析質譜儀（GC-MS）來進行分析，比對FTIR與GC-MS分析結果發現在150℃收集的液體為直鏈（degree of polymerization＜20）及環狀（tetramer以上）矽氧烷，來源為未熟化之基材；在300℃收集的液體經FTIR分析為直鏈（degree of polymerization＜20）及環狀（trimer以上）矽氧烷，此現象即可證明DC93-104以環化反應為其主要之裂解途徑；由450℃收集的液體分析發現有八甲基環狀四矽氧烷及雙環物的存在，暗示著有新的環化裂解途徑的加入，而造成DC93-104在熱重分析微分圖（DTG）所觀察到的第三個裂解步驟的形成。

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一、 文獻回顧 1
1-1. 前言 1
1-2. 阻燃層DC93-104之相關文獻 4
1-3. 聚矽氧烷之裂解型態相關文獻 7
1-4. 化學分析電子光譜儀之基本原理與相關文獻 11
二、 研究動機 16
三、 實驗 17
3-1. 實驗材料與樣品製備 17
3-1-1. 材料結構與組成 17
3-1-2. 常壓高溫試片（代稱：DC-HT）製備流程 18
3-1-3. 高壓試片（代稱：DC-HP）製備流程 20
3-1-4. 液體收集流程 22
3-2. 實驗流程 23
3-3. 實驗儀器與方法 25
3-3-1. 模擬軟體 25
3-3-2. 熱重分析儀（TGA） 25
3-3-3. 化學分析電子光譜儀（ESCA） 25
3-3-4. 傅利葉轉換紅外線光譜儀（FT-IR） 27
3-3-5. 氣相層析質譜儀（GC-MS） 27
3-3-6. 核磁共振光譜儀（NMR） 28
四、 結果與討論 29
4-1. 應用軟體 29
4-2. 熱重分析儀 29
4-3. 傅利葉轉換紅外線光譜儀 32
4-4. 氣相層析質譜儀 35
4-5. 化學分析電子光譜儀 46
4-5-1. 經高溫處理後之DC93-104（DC-HT） 46
4-5-2. 經高壓加熱處理後之DC93-104（DC-HP） 53
五、 結論 56
六、 參考文獻 58

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