研究生: |
王家樺 Chia-Hua, Wang |
---|---|
論文名稱: |
環氧樹脂橋接矽氧烷製備混成奈米複合材料及其特性之研究 Preparation and Properties of Nano Hybrid Composites from Epoxy-bridged Polyorganosiloxanes |
指導教授: |
馬振基
Chen-Chi M. Ma |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 147 |
中文關鍵詞: | 環氧樹脂 、奈米複合材料 、矽氧烷 |
相關次數: | 點閱:2 下載:0 |
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本研究旨在探討以環氧樹脂(DGEBA type epoxy resin)為主要有機鏈段材料,藉由與帶有胺基之烷氧基矽氧烷化合物(3-aminopropyltriethoxysilane,APTES)進行反應後,獲得末端具反應性矽氧烷之反應前驅物。以此種橋接聚矽氧烷中間體與烷氧金屬化合物進行奈米混成複合材料結構之製備與合成,透過一般加熱硬化方式可獲得有機無機金屬氧化物-有機高分子混成複合材料;並比較催化劑的添加量對材料結構和性質之影響。
本研究以FT-IR、1H NMR確定前驅物之結構及其反應性;以29Si CP/MAS NMR鑑定混成複合材料鍵結結構;以TGA、TMA、DMA探討材料之熱性質及熱機械性質;以SEM、TEM觀察材料之微觀型態;並以UV-Vis和折射率量測瞭解材料之光學性質。
在Tetrabutyltitinate (TBT)系統部份,發現材料之折射率隨著TBT量之增加而提升,當加入50 phr TBT時,折射率由1.550增至1.590;同時材料透明性良好(UV-Vis在580nm左右之穿透率約100%)。
在Tetraethoxysilane(TEOS)系統部分,發現TEOS添加量大於20phr時,Q型取代鍵結(主要為Q3和Q4取代)結構逐漸顯現,且催化劑,BF3MEA的存在會使得Q型鍵結比例上升,形成更加緻密的交聯結構,而影響材料之熱性質和微觀型態。加入約0.2wt %的催化劑,BF3MEA時,可得到最佳的熱穩定性,焦炭率由26.8%增加到52.5%(提升量96%);加入約0.1wt%的催化劑,BF3MEA時,其尺寸安定性最佳,CTE由121μm/moC降至60.4μm/moC;加入約1.0wt%的催化劑,BF3MEA時,storage modulus由1Mpa增至6.7Mpa(提升量570%)。型態學研究方面,添加催化劑,BF3MEA者可在TEM照片中觀察到奈米等級的SiO2顆粒,且尺寸隨著添加量而改變,從20nm(0.1 wt% BF3MEA)到200nm(1 wt% BF3MEA)。
Epoxy-bridged alkoxysilane reactive precursor has been synthesized in this study by reacting DGEBA epoxy with 3-aminopropyltriethoxysilane. Nano hybrid composites structures were prepared and investigated from the combination of epoxy-bridged alkoxysilane reactive precursor with tetraalkoxysilcate and tetraalkoxy titanate through direct thermal curing process. The effect of catalyst on the structure and properties of the nanohybrid composites were also discussed and compared.
FT-IR and 1H NMR were used to characterize the reactivity and structure of epoxy-bridged alkoxysilane reactive precursors. The cured hybrid composite structures of epoxy-bridged alkoxysilane with tetraalkoxysilane were investigated by 29Si CP/MAS NMR. TGA, TMA, and DMA were utilized to analyze the thermal and thermal mechanical properties of the cured epoxy bridged-polysilsesquioxane nanosilica composites.
The optical properties of the cured epoxy bridged-polysilsesquioxane nano titanianoxide composites were also discussed in this study. The refactive index of the cured epoxy bridged-polysilsesquioxane nano titanianoxide composites were found to increase from 1.55 to 1.59 when 50 phrs of tetrabutyltitinate (TBT) was mixed with epoxy-bridged alkoxysilane reactive precursor. Transparent hybrid composite film was obtained in the cured structure of epoxy bridged-polysilsesquioxane nano titanianoxide composites.
Q4 (tetra-substituted siloxane bond) silica structure was found in the hybrid of epoxy bridged-polysilsesquioxane with nanosilica when the amount of TEOS added to the epoxy-bridged alkoxysilane reactive precursor was greater than 20phr. The existence of BF3MEA catalyst during curing reaction would help the formation Q4 silica structure from the precursors of epoxy-bridged alkoxysilane with TEOS. The thermal properties and morphologies of the cured epoxy bridged-polysilsesquioxane with nanosilica composite were also affected by adding the BF3MEA curing catalyst.
The best thermal stability of the cured epoxy bridged-polysilsesquioxane with nanosilica composite was obtained when 0.2 weight percent of BF3MEA catalyst was used for the precursors of epoxy-bridged alkoxysilane with TEOS. Almost 96% improvement in char. yield was found in the cured epoxy bridged-polysilsesquioxane with nanosilica composite less than 0.2wt% of BF3MEA curing catalyst was used comparing with the pure cured epoxy bridged-polysilsesquioxane. When 0.1wt% of BF3MEA catalyst was used for the thermal curing epoxy-bridged alkoxysilane with TEOS, the best dimensional stability was found. The coefficient of thermal expansion was reduced from 121μm/moC to 60.4μm/moC. and the storage modulus increased from 1Mpa to 6.7Mpa(about 570% enhancement). The best storage modulus (E’) was obtained when 1.0 weight percent of BF3MEA catalyst was used for the precursors of epoxy-bridged alkoxysilane with TEOS.
The TEM spectra of the cured epoxy bridged-polysilsesquioxane with nanosilica composite also showed that BF3MEA curing catalyst exhibited strong effect on the dimension of nanosilica form in the epoxy bridged-polysilsesquioxane matrix. The size of nanosilica formed in the epoxy bridged-polysilsesquioxane matrix changed with the amount of BF3MEA curing catalyst added. Nanosilica with 20nm diameters was found less than 0.1wt% of BF3MEA curing catalyst and the diameter of nanosilica will increase to 200 nm when more than 1wt% of BF3MEA curing catalyst was used.
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