研究生: |
蕭建中 CHIEN-CHUNG HSIAO |
---|---|
論文名稱: |
合成含苯並咪唑之聚醯亞胺質子傳導膜及其性質研究 Synthesis and Characterization of Polyimides Containing Benzimidazoles Groups for Proton Exchange Membrane |
指導教授: |
陳燿騰
Yaw-Terng Chern |
口試委員: |
華沐怡
Mu-Yi Hua 黃炳照 Bing-Joe Hwang |
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: | 2019 |
畢業學年度: | 107 |
語文別: | 中文 |
論文頁數: | 100 |
中文關鍵詞: | 苯並咪唑 、聚醯亞胺 、質子傳導度 、質子交換膜 |
外文關鍵詞: | Benzimidazole, Polyimide, Proton conductivity, Proton exchange membrane |
相關次數: | 點閱:197 下載:0 |
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成功合成主鏈含苯並咪唑之新型二胺單體3-(2-(5-amino-benzimidazolyl))aniline (m/IM/NH2),並與六環酸酐Naphthalenetetra-carboxylic dianhydride (NTDA)進行高溫聚縮合形成一系列的PI共聚物;其固有黏度範圍在1.01~1.59 dL/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 %重量損失溫度皆有530℃以上,而氮氣下的裂解溫度也在500℃以上;這些PI共聚物乾膜的抗張強度介於92~135 MPa,但是當摻雜磷酸後,薄膜受到磷酸的膨潤,機械強度會明顯下降。因此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,使高分子鏈緊密堆積,導致磷酸摻雜量減少,但仍能有足夠高的質子傳導度,並能維持好的機械性質。所合成PI共聚物的質子傳導度在磷酸摻雜率大於240%的時候,幾乎都比m-PBI高,例如交聯前後之m6BPBI2PF1.5DMB0.5在160℃時之質子傳導度都高於m-PBI (54.1 mS/cm),分別為65.6 mS/cm與61.0 mS/cm,非常有潛力應用於高溫型燃料電池的質子傳導膜。
A Novel diamine 3-(2-(5-aminobenzimidazolyl))aniline(m/IM/NH2), containing benzimidazole backbone was synthesized. The polyimides (PIs) were prepared by polycondensation of the diamines and Naphtha-lenetetracarboxylic dianhydride(NTDA). They had inherent viscosities in the range of 1.01~1.59 dL/g, and they could form tough and flexible films. The PIs exhibited high thermal stability with 10% decomposition temper-ature more than 530℃ in nitrogen, and their onset temperature was more than 500℃ in nitrogen. These films exhibited good mechanical properties with tensile stress around 92~135 MPa. However, the mechanical proper-ties of PIs significantly decreased when phosphoric acid doping level in-creased. This situation could be improved via crosslinking reaction of methyl group, cross-linked PIs would form close packing, and it led to decrease of phosphoric acid doping level, but it could still maintain high proton conductivity. The PIs when phosphoric acid doping level exceeded 240%, exhibited higher proton conductivity than m-PBI. For example, the proton conductivities of m6BPBI2PF1.5DMB0.5 and C5-m6BPBI2PF1.5DMB0.5 were 65.6 and 61.0 mS/cm at 160℃, respec-tively. Thus, these PIs could be the promising materials alternative to m-PBI membrane for high-temperature fuel cells applications because of their high proton conductivity and good oxidative stability.
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