| 研究生: |
林永崇 Lin, Yung-chung |
|---|---|
| 論文名稱: |
高溫質子交換膜燃料電池用含氟含矽聚苯咪唑之合成與性質研究 Synthesis and properties of fluorine and siloxane containing polybenzimidazole for high-temperature proton exchange membrane fuel cells |
| 指導教授: |
許聯崇
Shiu, Lian-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: | 2008 |
| 畢業學年度: | 96 |
| 語文別: | 中文 |
| 論文頁數: | 92 |
| 中文關鍵詞: | 甲醇 、交聯 、導電度 、質子交換膜 |
| 外文關鍵詞: | DMFC |
| 相關次數: | 點閱:57 下載:3 |
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本研究,利用3,3’-Diaminobenzidine、2,2-Bis(4-carboxyphenyl)- hexafluoropropane( HFA )、1,3-bis(carboxypropyl)-tetramethyldisiloxane ( BCPTMDS )等單體成功地合成含氟含矽PBI共聚合物,並依單體比例不同獲得六組PBI共聚合物。再利用溶液鑄模的方法製備PBI薄膜,以及將薄膜浸泡在磷酸的方式摻雜磷酸。以FTIR、X-ray及1H-NMR等分析鑑定合成出的六組PBI共聚合物之組成與結構。由於導入大基團含氟單體( HFA )與柔軟基團含矽單體( BCPTMDS ),PBI在DMAc中的溶解度呈大幅度的上升。在熱性質方面,導入含氟與含矽單體後PBI仍具有良好的熱穩定性與尺寸安定性。機械性質方面,PBI共聚合物平均擁有約88MPa的破斷應力與2GPa的彈性模數,顯示出具有良好的機械強度;另外甲醇滲透率的實驗結果也顯示出PBI共聚合物薄膜是很好的甲醇滲透抵擋材料。在質子導電度方面,導電度隨磷酸摻雜程度增加而增加,在150℃無水的環境下擁有最高磷酸摻雜程度的PBI膜約有1.6 10-4 ( S/cm )的質子導電度。
In this study, fluorine-siloxane containing PBI copolymers were synthesized by copolymerization of 3,3’-Diaminobenzidine, 2,2- Bis(4-carboxyphenyl)-hexafluoropropane( HFA ) and 1,3- bis(carboxypropyl)-tetramethyldisiloxane( BCPTMDS ) with different molar ratio. PBI membranes were prepared by solution-casting and then doped with phosphoric acid. The structures of PBI copolymers were characterized by FTIR, X-ray and 1H-NMR. The solubility of PBI was significantly increased by the introduction of a bulky group, HFA, and a flexible group, BCPTMDS, into the polymer backbone. The excellent thermal stability and dimension stability of PBI were still maintained. The PBI copolymers exhibited good mechanical properties with average tensile strength at about 88MPa and average Young’s modulus at 2GPa. Additionally, from the methanol permeability experiment, PBI copolymers exhibited excellent resistance of methanol permeability. The proton conductivity of phosphoric acid doped PBI was dependent on the doping level. Under anhydrous condition, the proton conductivity of the highest doping level PBI membrane was about 1.6×10-4 ( S/cm ) at 150℃.
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