| 研究生: |
巫俊昌 Wu, Chun-Chang |
|---|---|
| 論文名稱: |
利用溶膠-凝膠法製備聚苯噁唑/二氧化鈦奈米複合材料之研究 Preparation and Properties of Polybenzoxazole/TiO2 Hybride Nanocomposites via Sol-Gel process |
| 指導教授: |
許聯崇
Hsu, Lien-Chung |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 材料科學及工程學系 Department of Materials Science and Engineering |
| 論文出版年: | 2005 |
| 畢業學年度: | 93 |
| 語文別: | 中文 |
| 論文頁數: | 88 |
| 中文關鍵詞: | 溶膠-凝膠法 、聚苯噁唑 、複合材料 、二氧化鈦 |
| 外文關鍵詞: | sol-gel, PBO, compositew, TiO2 |
| 相關次數: | 點閱:64 下載:0 |
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本研究利用溶膠-凝膠法製備聚苯噁唑/二氧化鈦(PBO/TiO2)奈米複合材料。利用BisAPAF和IC兩種單體在低溫(5℃)聚合成PHA前驅物,可得PHA本質黏度值為0.31 dL/g。接著將Ti(OC2H5)混摻於PHA前驅物之中,製成TiO2/PHA薄膜。最後將TiO2/PHA薄膜經由多段升溫條件之下,於350℃脫水環化之後形成TiO2/PBO薄膜。將薄膜進行各項分析研究,經由TEM圖中可看出TiO2均勻分散於PBO基材中,且隨著TiO2量的增加,顆粒大小也跟著增加,但大小都小於50nm且分散性良好,此結果與SEM分析相符合。玻璃轉移溫度(Tg)會隨著TiO2量的增加而有一線性的增加,當TiO2增加到達9.53wt %時其Tg為305℃,較純PBO提高了約25℃,添加TiO2時可提升薄膜的玻璃轉移溫度,但是添加TiO2時會降低薄膜的熱裂解溫度。經由橢圓偏光儀可得知折射率(n)會隨著TiO2量的增加而有一線性的增加,當TiO2增加到達9.53wt %時在入射波長633nm其折射率為1.72,添加TiO2時可提升薄膜的折射率,不管TiO2的添加量為何,消光係數(k)在波長400-900nm的範圍都近乎為零,表示PBO/TiO2薄膜在可見光的範園有很好的光學穿透性,此結果與Uv-Visible光譜分析結果相符。從TiO2實際含量的分析可知理想值跟實際量很接近,證明溶膠-凝膠反應進行相當良好,產率非常的高。
A polybenzoxazole(PBO)/ TiO2 nanocomposite has been prepared by sol-gel process. The PBO precursor , polyhydroxyamide (PHA), was prepared by a low temperature polycondensation reaction between isophthaloyl chloride(IC) and 2,2-bis (3-amino-4-hydroxyphenol) hexafluoropropane (BisAPAF) with an inherent viscosity of 0.31 dL/g, and then Ti(OC2H5) was added to PHA solution. A TiO2/PBO film was obtained by casting from TiO2/PHA and cured at 350℃. Transmission electron microscope (TEM) analyses showed that the TiO2 was dispersed in PBO matrix in a nanosacle. The result is consistent with the observation from scanning electron microscope (SEM). The size of the TiO2 increased with the increasing TiO2 content. The glass transition temperature (Tg) of PBO/ TiO2 film increased linearly with increasing amounts of TiO2. The glass transition temperature(Tg) of the PBO/ TiO2 film containing 9.53 wt % TiO2 increased 25oC compared to the pure PBO film. The refractive index (n) of PBO/ TiO2 film increased linearly with increasing amounts of TiO2. The refractive index (n) of the PBO/ TiO2 film containing 9.53 wt % TiO2 increased 0.05 compared to the pure PBO film. Excellent optical transparence was obtained in the visible light region for the PBO/ TiO2 thin films.
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