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論文名稱 Title |
改質聚氨酯/聚矽氧烷耐燒蝕材料研究 Study on the Ablation Materials of Modified Polyurethane/Polysiloxane |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
248 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2004-07-28 |
繳交日期 Date of Submission |
2004-08-17 |
關鍵字 Keywords |
熱重分析/紅外線光譜、衰減全反射/紅外線光譜、絕熱層、溶凝膠、聚碳化二亞胺、端羥基聚丁二烯、焦化層、聚矽氧烷 ATR/FTIR, Char, Sol-gel, Polysiloxane, Insulator, HTPB, Polycarbodiimide, TGA/FTIR |
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中文摘要 |
端羥基聚丁二烯 (Hydroxyl terminated polybutadiene-HTPB)為基體的聚氨酯 (PUs) 具有低模數 (modulus) 及在低溫裂解的特性,聚碳化二亞胺 (Polycarbodiimide-PCDI) 和液態二氧化矽之聚矽氧烷 (Polysiloxane-PSi)是反應型添加劑,分別以碳化二亞胺化反應 (carbodiimidization) 和溶凝膠法(sol-gel)合成,PCDI和PSi在燃燒過程中釋放出無毒、無腐蝕性的揮發性氣體,最後形成碳質或矽質的焦化層 (carbonaceous or siliceous char)。本文研究PCDI和PSi添加使改質PUs材料具有高含量碳、氮及矽等成份,同時改質PUs是一種有機-無機混成材料 (organic-inorganic hybrid),比起以HTPB為基體的PUs材質,具有較高的模數及熱穩定性。此外,以GE Silicones 產品LSR-2670混合RTV-627進行新型矽橡膠 (LR) 絕熱材料的製備,目的能夠增進隔熱及降低燒蝕率,並添加PUs改質矽橡膠增加其與發動機鋼殼間之壁結強度,尤其是澆鑄型矽橡膠絕熱材料應用在衝壓引擎 (ramjet engines),能夠避免發動機在高溫下長時間使用被沖刷燒蝕掉。 利用拉力試驗機及熱重分析儀探討改質聚氨酯及矽橡膠機械性能和熱穩定性。以衰減全反射-紅外線光譜 (Attenuated Total Reflectance / Fourier Transform Infrared- ATR/FTIR) 技術應用在PCDI合成過程的監測及經TG (Thermogravimetry) 熱裂解前後絕熱層表面化學的探討。使用熱重分析儀 (TGA) 並結合FTIR (TGA/FTIR) 技術來探討絕熱層在氮氣或空氣下裂解熱穩定性、動力學和反應機構,從動態熱分析以Friedman和Kissinger 方法來計算絕熱層熱裂解的活化能,改質聚氨酯(HIPTD-40%Psi及HIPTD-30%PMPS-PSi)平均活化能分別為88和112 kcal/mol (0.5<α<0.9, under N2 ),改質矽橡膠 (LR-5%HTB) 活化能分別為46.2~67.0 kcal/mol (0.1<α<0.9, under N2 ) 及34.0~59.1 kcal/mol (0.1<α<0.9, under air)。由一系列升溫速率改變 (1、3、5、10、20、30、40和50 ℃/min) 評估熱裂解最大分解溫度及焦化層殘留量,假設當火箭發動機燃燒時升溫速率為5000 ℃/min,可估算改質聚氨酯(HIPTD-40%PSi及HIPTD-30%PMPS-PSi) 在氮氣下Tmax分別為538和522℃,改質矽橡膠 (LR-5%HTB) 在氮氣和空氣環境下Tmax分別為576和562℃,同時改質矽橡膠焦化層的殘留量 (char yield-CY) 分別為71.5和66.2%。利用光學及掃瞄電子顯微鏡 (Optical/Scanning Electron Microscope) 觀察經由熱重分析儀熱裂解前後改質聚氨酯及矽橡膠形態 (morphology)。 |
Abstract |
Hydroxyl terminated polybutadiene (HTPB) based polyurethanes (PUs) are low modulus materials and degrade easily at low temperature. Polycarbodiimide (PCDI) and polysiloxane (PSi) are reactive-type fillers when formed by carbodimidzation and sol-gel process, respectively. During the combustion, PCDI and PSi give off non-toxic, non-corrosive volatile gases, and finally form carbonaceous and siliceous chars. In this study, modified PUs were prepared by incorporating PCDI or PSi into PUs to give high carbon, nitrogen and silicon materials. These modified PUs are kinds of organic-inorganic hybrids with higher modulus and higher thermal stability than HTPB-based PUs. In addition, new silicone based insulation materials were prepared by mixing two silicone rubber materials LSR-2670 and RTV-627 from GE Silicones, in order to improve the heat insulation and to reduce the ablation rate. These inhibitors can keep the rocket motor from the high temperature ablation for a long time, especially castable silicone based heat insulations for the case of the ramjet engines. The mechanical properties at room temperature and the thermal stability of these modified PUs and silicone rubbers were investigated using a tensile tester and a thermogravimetric analyzer (TGA). ATR/FTIR (Attenuated total reflectance / Fourier transform infrared) technique is applied to monitor the synthesis process of PCDI and to examine the change of surface chemistry of insulator before and after thermal degradation via TGA. TGA coupled with FTIR (TGA/FTIR) was used to analyze the kinetics and the mechanism of thermal degradation under nitrogen and/or air. The Friedman and Kissinger methods of analysis were used for calculating the activation energy of degradation from dynamic TGA. The modified PUs (HIPTD-40%Psi及HIPTD-30%PMPS-PSi) with average activation energy of 88 and 112 kcal/mole (0.5<α<0.9, under N2) and the modified silicone rubber (LR-5%HTB) with activation energy of 46.2~67.0 kcal/mole (0.1<α<0.9, under N2) and 34.0~59.1 kcal/mole (0.1<α<0.9, under air).The maximum degradation temperature (Tmax) and char yield (CY) of thermal degradation were estimated from a series of experiments with heating rates of 1, 3, 5, 10, 20, 30, 40 and 50 ℃/min, under nitrogen or air. It is apparent that the maximum degradation temperature is dependent on heating rate. By assuming the heating rate for the insulator used in a rocket operating environment is about 5000℃/min, Tmax calculated for the modified PUs (HIPTD-40%PSi and HIPTD-30%PMPS-PSi under N2) are found as 538 and 562℃ and for the modified silicone rubber (LR-5%HTB under N2 and air) are found as 576 and 562℃, respectively. CY calculated for the modified silicone rubber (LR-5%HTB under N2 and air) is found as 71.5% and 66.2%. The morphology of modified PUs and silicone rubbers before and after thermal degradation via TGA was observed by optical and scanning electron microscope (SEM). |
目次 Table of Contents |
1.前言…………………………………………………………………1 1.1 絕熱層性能基本要求……………………………………………2 1.1.1 耐燒蝕、隔熱性能……………………………………………2 1.1.2 機械性能………………………………………………………2 1.1.3 黏結強度………………………………………………………3 1.1.4 相容性…………………………………………………………3 1.1.5 發煙量…………………………………………………………4 1.1.6 施工性…………………………………………………………4 1.2 絕熱層材料的選擇………………………………………………4 1.2.1 高分子基體材料………………………………………………4 1.2.2 耐燒蝕填充料…………………………………………………4 1.3 研究目的…………………………………………………………5 1.3.1 粉態剝離阻燃層………………………………………………5 1.3.2 高碳化阻燃層…………………………………………………5 1.4.文獻回……………………………………………………………6 1.4.1 絕熱層材料概…………………………………………………6 1.4.1.1 V-44絕熱層材料…………………………………………..7 1.4.1.2 DC93-104絕熱層………………………………………....8 1.4.1.3 乙烯-丙烯-二烯絕熱層橡膠-EPDM……………………….9 1.4.2 絕熱材料的燒蝕…………………………………………….10 1.4.2.1 絕熱層燒蝕反應機構(mechanism of ablation)………10 1.4.2.2 絕熱層燒蝕模式………………………………………….11 1.4.3 絕熱材料的阻燃機理……………………………………….12 1.4.3.1 氣相阻燃機……………………………………………….12 1.4.3.2 凝聚相阻燃機理………………………………………….13 1.4.3.3 中斷熱交換阻燃機理…………………………………….13 1.4.4 絕熱層燒蝕率的概述……………………………………… 13 1.4.4.1 絕熱層燒蝕率的測……………………………………...15 1.5. 研究內容………………………………………………………16 1.5.1 HTPB的特性………………………………………………….17 1.5.2 聚矽氧烷聚合物分子結構與性能………………………….19 1.5.3 聚合物相容性……………………………………………….20 1.5.3.1 相容性熱力學原理……………………………………...20 1.5.3.2 相容性的預測…………………………………………...22 1.5.4 阻燃層開發現況…………………………………………….24 1.5.4.1 矽酸鈣粉態剝離阻燃層開發…………………………...24 1.5.4.2 矽基橡膠高碳化阻燃層………………………………...25 1.6 參考文獻……………………………………………………….28 2. 聚碳化二亞胺及共聚合物的製備………………………………31 2.1 前言…………………………………………………………….31 2.2 實驗內容……………………………………………………….32 2.2.1 化學原料及合成高分子……………………….………....32 2.2.2 衰減全反射-紅外線光譜原理…………………………....33 2.2.3 機械性能測試………………………………………….…..35 2.2.4 動態機械性質分析…………………………………….....36 2.2.5 聚碳化二亞胺-PCDI的製備…………………..…………..36 2.2.6 聚氨酯/聚碳化二亞胺(PU/PCDI)共聚合物的製備……….38 2.2.7 聚碳化二亞胺/聚矽氧烷共聚合物的製備………………..41 2.3 實驗結果……………………………………………..……….42 2.3.1 聚碳化二亞胺分子量測量……………..…….……......46 2.3.2 聚氨酯/聚碳化二亞胺共聚合物機性….…….…...…...48 2.3.3 聚氨酯/聚碳化二亞胺共聚合物ATR-FTIR……………....57 2.3.4 聚氨酯/聚碳化二亞胺共聚合物動態機械性質分析…....62 2.3.5 聚氨酯/聚碳化二亞胺共聚合物熱特性…………………..64 2.3.6 聚矽氧烷 /聚碳化二亞胺共聚合物熱特性探討………….66 2.4 結論…………………………………………………………….76 2.5 參考文獻……………………………………………………….77 3. 溶凝膠法-聚矽氧烷製作……………………………….………81 3.1 前言…………………………………………………………….81 3.2 液態二氧化矽的研製………………………….………………81 3.3 實驗內容…………………………………………….…………85 3.4 結果與討論…………………………………….………………88 3.4.1 熱重量分析法(TGA ) …………………...…….…………88 3.4.2 紅外線光譜分析………………………...…….…….……90 3.4.3 核磁共振光譜…………………………...……..…………93 3.4.4 聚矽氧烷合理分子式(rational formula)計算.…………95 3.4.5 凝膠滲透層析法(GPC)..………………...…….…………96 3.4.6 PSi聚合物熱穩定性評估……………...………….…….98 3.4.7 ATR-FTIR對PSi熱裂解行為的探討...…….…….……..99 3.5結論…………………………………………….……..………107 3.6 參考文獻……………………………………….…….………108 4. 有機-無機高分子混成材料的製備………………………….110 4.1 前言…………………………………………………..……..110 4.2 聚氨酯/聚矽氧烷高分子混成材料的製備…………...……111 4.3 聚氨酯/聚矽氧烷共聚合物機械性能探討………….……..113 4.4 聚氨酯/聚矽氧烷共聚合物熱特性……………….…..…..115 4.5 聚氨酯/聚矽氧烷熱分解的影響………..………….……..119 4.5.1 升溫速率對熱分解的影響….…...……………..……..119 4.5.2 熱分解動力學分析…….…………………………….....124 4.5.3 混成材料形態學(Morphology)的探討………………...129 4.6 結論……………………..…………………………..……..135 4.7參考文獻……………..……………………………...……..136 5. 矽橡膠耐燒蝕材料的開發…………………………………...138 5.1 前言..……………………………………………………....138 5.2 實驗內容……………………………..…………………....139 5.2.1 實驗藥品………...……………..……………………….139 5.2.2 研製步驟………...……………..……………………….140 5.3 實驗方法……………………………………………..………142 5.3.1. 黏度測試與釜壽期(pot life)預測…………………….142 5.3.2 熱重量分析 (TGA ) ..…………………………………..142 5.3.3 衰減全反射-紅外線光譜儀 (ATR-FTIR)…………………142 5.3.4 機械性能測試………..……………..……….………….143 5.3.5 形態學的探討………..………….……..……………….143 5.4 結果與討論…………………………………………………..144 5.4.1 黏度變化探討………..………………………….… …..145 5.4.2 熱特性與機械性能的探討……..…………...….…..…146 5.4.3 RTV對LSR熱特性與機械性能的影響………...….…….146 5.4.4 SF-96-50對LSR熱特性與機械性能的影響………..…..147 5.4.5 CF對LSR熱特性與機械性能的影響…………………....148 5.4.6 GF對LSR熱特性與機械性能的影響…………………....148 5.4.7 CNT對LSR熱特性與機械性能的影響…….…………....149 5.4.8 PU/HTPB對LSR熱特性與機械性能的影響……………...149 5.4.9 矽橡膠絕熱層熱裂解行為探討……………………………164 5.4.9.1 DC93-104絕熱層熱裂解行為探討……………….....164 5.4.9.2 LR絕熱層熱裂解行為探討…………………….......175 5.4.9.3 LR-5%HTB絕熱層熱裂解行為探討…….……........186 5.4.10矽橡膠焦化層形成及形態學的探討………………...….198 5.4.10.1矽橡膠焦化層形成………………………………......198 5.4.10.2矽橡膠燒蝕前後形態學的探討…………………......200 5.4.11矽橡膠絕熱材質表面ATR-FTIR的探討…………………..214 5.4.12熱特性動力學探討.……………………………………...218 5.4.13升溫速率對熱分解的影響.……………………..……….225 5.4.13.1升溫速率對熱分解-FTIR光譜的探討……….…......225 5.4.13.2升溫速率與Tmax及焦化層殘餘量的關係….…….....237 5.5 結論……………………………………………………………244 5.6 參考文獻………………………………………………………246 |
參考文獻 References |
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