研究生: |
魏安幸 An-Shing Wei |
---|---|
論文名稱: |
合成新型含苯並咪唑側基之聚苯並咪唑於中溫型燃料電池之質子傳導膜之性質研究 Synthesis and Characterization of New Polybenzimidazoles Containing Pendent Benzimidazole Groups for Proton Exchange Membrane Fuel at Intermediate Temperature |
指導教授: |
陳燿騰
Yaw-Terng Chern |
口試委員: |
蔡大翔
Dah-Shyang Tsai 陳志堅 Jyh-Chien Chen 劉貴生 Guey-Sheng Liou 蕭勝輝 Sheng-Huei Hsiao |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2013 |
畢業學年度: | 101 |
語文別: | 中文 |
論文頁數: | 93 |
中文關鍵詞: | 聚苯並咪唑 、中溫型 、燃料電池 、苯並咪唑 |
外文關鍵詞: | Intermediate TemperatureFuel Cell |
相關次數: | 點閱:288 下載:1 |
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本研究主要合成側鏈含苯並咪唑側基之PBI聚合物,這些聚合物具有好的溶解度,其固有黏度範圍在0.98~1.37 dL/g之間,均可塗佈成具有韌性之薄膜,且有好的熱安定性,於氮氣下開始裂解溫度為635~710℃、高的玻璃轉移溫度,它的抗張強度大於90 MPa,但是當摻雜磷酸後,會使機械強度大幅下降。為了提高吸磷酸薄膜機械強度,本研究首先引進苯環含甲基側基應用於質子交換膜的交聯上,合成交聯型之C-PBI聚合物,以增進摻雜磷酸後的機械強度。在質子導電度方面,質子傳導度隨溫度與磷酸摻雜量增加而增加,其中C-PBI-1與C-PBI-2系列的質子傳導度都比m-PBI還高,例如C-5-PBI-1-20在200 ℃無水的環境下,飽和磷酸摻雜為343 wt%,質子導電度為67.4 mS/cm 比m-PBI(58.8 mS/cm)的質子傳導度高。
因此這些側鏈含苯並咪唑基之PBI及C-PBI系列薄膜具有高磷酸摻雜量、高質子傳導度和好的熱安定性,是很有潛力成為中溫型燃料電池的質子交換膜材料。
A series of new polybenzimidazoles (PBIs) with pendant benzimidazole ring have been synthesized. The resulting polymers showed good solubility in aprotic solvents. They had inherent viscosities in the range of 0.98~1.37 dLg-1, and they could form tough and flexible films. They exhibited good thermal stability with initial decomposition temperature ranging from 635 to 710 ℃, and their glass transition temperature exceeded 250℃. These films exhibited good mechanical properties with tensile stress ranging from 90 to 164 MPa.。The mechanical properties of phosphoric acid doped PBI significantly decreased. This is the first study that improved mechanical properties of proton exchange membranes using crosslinking in methyl pendent PBIs. The proton conductivity of phosphoric acid doped PBI was dependent on phosphoric acid doping level and temperatures. The proton conductivity of C-5-PBI-1-20 was approximately 67.4 mS/cm at 200℃, compared with 58.8 mS/cm of m-PBI membrane.
Thus, these PBIs and crosslinking PBIs with pendant heterocyclic ring could be the promising materials alternative to Nafion membrane for medium-temperature fuel cells applications because they had high phosphoric acid doped, good stability, and higher proton conductivity.
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