研究生: |
陳仁文 REN-WUN Chen |
---|---|
論文名稱: |
合成含苯並咪唑側基之聚醯亞胺質子傳導膜及其性質研究 Synthesis and Characterization of Polyimides Containing Pendent Benzimidazoles Groups for Proton Exchange Membrane |
指導教授: |
陳燿騰
Yaw-Terng Chern |
口試委員: |
蔡大翔
王健珍 |
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: | 2017 |
畢業學年度: | 105 |
語文別: | 中文 |
論文頁數: | 101 |
中文關鍵詞: | 苯並咪唑 、聚醯亞胺 、質子傳導膜 |
外文關鍵詞: | proton exchange membrane, polyimide, benzimidazole |
相關次數: | 點閱:201 下載:0 |
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本研究成功合成具有benzimidazole側基之聚醯亞胺(PI)共聚物,其固有黏度範圍在 1.08~1.96dL/g 之間,均可塗佈成具有韌性之薄膜,這些共聚物有好的熱安定性,於氮氣下10 %裂解溫度皆有500℃以上、以及高的玻璃轉換溫度(Tg約在 300 ℃),聚合物尚未摻雜磷酸的抗張強度大於110 MPa,但是當摻雜磷酸後,薄膜受到磷酸的膨潤,機械強度會大幅下降。藉由甲基側基進行交聯反應,形成交聯 PI 共聚物,交聯後 PI 共聚物因受交聯鍵結,形成高分子鏈緊密堆積,導致磷酸摻雜量下降,但仍能有足夠高的質子傳導度,並能維持好的機械性質。質子傳導度隨溫度與磷酸摻雜量增加而增加,本研究所合成PI共聚物的質子傳導度幾乎都比m-PBI高,這結果顯示導入benzimidazole環在側基比在主鏈更有利於提高質子傳導度,例如交聯前後之BPBI7mBI2PF0.5DMB0.5在160℃時之質子傳導度都高於m-PBI (54.1 mS/cm)分別為77.3 mS/cm與68.5 mS/cm,很有潛力應用於中溫型燃料電池的質子傳導膜。
A series of copolyimides (PIs) with pendant benzimidazole had been synthesized. They had inherent viscosities in the range of 1.08~1.96 dL/g, and they could form tough and flexible films. The PIs exhibited high thermal stability with 10% decomposition temperature more than 500℃ in nitrogen, and their glass transition temperature is around 300℃. These films exhibited good mechanical properties with tensile stress exceeded 110 MPa. However, the mechanical properties of PI significantly decreased when phosphoric acid doping level increased. This situation can be improved via crosslinking reaction of methyl group,
cross-linked PI would form close packing ,and it led to decrease of phosphoric acid doping level, but it could still maintain high proton conductivity.
The proton conductivity of phosphoric acid doped PI was dependent on doping PA level and temperature. The proton conductivity of BPBI7mBI2PF0.5DMB0.5 and C5- BPBI7mBI2PF0.5DMB0.5were 77.3 and 68.5 mS/cm at 160℃, respectively. The proton conductivity of PI and C-PI were significantly higher than m-PBI (54.1 mS/cm). Thus, these polyimides (PIs) with pendant benzimidazole membranes could be the promising materials alternative to m-PBI membrane for medium-temperature fuel cells applications because of their high proton conductivity and good thermal stability.
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