研究生: |
陳俊融 Chun-jung Chen |
---|---|
論文名稱: |
合成含十二氟結構二酸與聯苯四胺的新型聚并咪唑和其性質探討 Synthesis and Characterization of Novel Polybenzimidazole Derived from 2,2’-Bis[3,5-bis(trifluoromethyl)phenyl]-4,4’-oxybis(benzoic acid) with 3,3’-Diaminobenzidine |
指導教授: |
陳志堅
Jyh-Chien Chen |
口試委員: |
游進陽
Chin-Yang Yu 王英靖 none |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 材料科學與工程系 Department of Materials Science and Engineering |
論文出版年: | 2013 |
畢業學年度: | 101 |
語文別: | 中文 |
論文頁數: | 59 |
中文關鍵詞: | 聚并咪唑 、燃料電池 |
外文關鍵詞: | Polybenzimidazole, fuel cell |
相關次數: | 點閱:278 下載:4 |
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本研究利用4,4'-Oxybis(benzoic acid)作為起始物,經過溴化、酯化、鈴木偶合與水解反應得到含有bis(trifluoromethyl)phenyl 的新型二酸2,2’-bis[3,5-bis(trifluoromethyl)phenyl]-4,4’-oxybis(benzoic acid)。以此新型二酸與聯苯四胺(3,3'-diaminobenzidine)以Eaton’s reagent為溶劑聚合出一新型polybenzimidazole (PBI),12F-PBI。其數目平均分子量為57000 g/mol,固有黏度(inherent viscosity,0.5 g/dL,NMP,30℃)為0.76 dL/g。熱裂解溫度T5%與T10%分別為445℃和470℃。並展現出極佳的氧化穩定性,在Fenton test 80小時後,僅有2.8%重量損失。12F-PBI的薄膜是以N-methyl-2-pyrrolidone為溶劑製備。在室溫摻雜磷酸後得到其ADL (acid doping level)為5.9,含磷酸重量百分比為170%。而80℃下摻雜磷酸後得到其ADL為8.8,含磷酸重量百分比為204%。12F-PBI薄膜未摻雜磷酸下,拉伸應力為97 MPa,而12F-PBI薄膜ADL為8.8時,拉伸應力為12 MPa。12F-PBI薄膜在160℃下進行質子傳導率的測試,當ADL為5.9時,質子傳導率為9 × 10-3 S/cm,當ADL為8.8時,質子傳導率為1.8 × 10-2 S/cm。而最後進行全電池測試,可得到最大電功率為200 mW/cm2,證實此新型高分子(12F-PBI)可應用於質子交換膜燃料電池。
A novel diacid (12F-acid) containing bis(trifluoromethyl)phenyl as side group was prepared via four steps from 4,4'-oxybis(benzoic acid). 12F-PBI was synthesized from 3,3’-diaminobenzidine and novel diacid (12F-acid). The Mn of 12F-PBI was 57000 g/mol and the inherent viscosity was 0.76 dL/g. The decomposition temperature at 5% and 10% weight loss under nitrogen was 445℃ and 470℃. The proton exchange memebrane of 12F-PBI was prepared in 5% (by weight) NMP solution. The phosphoric acid doping level was 5.9 and phosphoric acid doped weight percent was 170% at room temperature. The phosphoric acid doping level was 8.8 and phosphoric acid doped weight percent was 204% at 80℃. The tensile strength of 12F-PBI was 97MPa without doping phosphoric acid but the tensile strength was 18MPa with acid doping level was 5.9. The proton conductivity of 12F-PBI was 9 × 10-3 S/cm at 160℃ when acid doping level was 5.9. The proton conductivity of 12F-PBI was 1.8 × 10-2 S/cm at 160℃ when acid doping level was 8.8. The max power density was 200 mW/cm2 at 160℃ when acid doping level was 8.8.
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