研究生: |
陳瀚宇 Han-Yu Chen |
---|---|
論文名稱: |
新型聚醚砜之合成與在鹼性陰離子交換膜燃料電池之應用 Synthesis of novel polyethersulfone and application on alkaline anion exchange membrane fuel cell |
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: | 2016 |
畢業學年度: | 104 |
語文別: | 中文 |
論文頁數: | 75 |
中文關鍵詞: | 聚醚砜 、陰離子交換膜 、限制性旋轉 、掌性軸 |
外文關鍵詞: | polyethersulfone, anion exchange membrane, restricted rotation, chiral axial |
相關次數: | 點閱:305 下載:0 |
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本研究以2,2’-dimethyl-4,4’-biphenyldiamine (m-tolidine)為起始物經重氮化水解合成二醇單體2,2’-dimethyl-4,4’-biphenyldiol。以DMAc為溶劑與4,4'-dichlorodiphenyl sulfone聚合成新型聚醚砜PES-DM。其數目平均分子量約為10萬。並進一步將甲基溴化,而溴化後之分子量介於90至100 KDa之間。此外我們於溴化的過程中發現PES-DM之聯苯結構會因2,2’位產生較大的立體障礙,而產生限制性旋轉,使其產生光學活性。而我們以DFT理論計算得到單邊溴化與雙邊溴化之PES-DM其旋轉能量障礙分別為76.34與78.58 KJ/mol。而在溴化後分別以1-methyl piperidine、1,2-dimethyl imidazole與trimethyl amine進行四級銨化並比較不同四級銨鹽基團之穩定性,分別為PES-DM-MP、PES-DM-DI及PES-DM-QA。其中以PES-DM-QA在1 M 80 oC氫氧化鈉水溶液中72小時後展現最佳之穩定性。我們將IEC值控制於0.8、1.4及1.8 mmol/g ,合成薄膜PES-DM-0.8QA、PES-DM-1.4QA及PES-DM-1.8QA。其於100 oC前無熱中損失,展現良好之熱穩定性。PES-DM-1.4QA及PES-DM-1.8QA在60 oC 1 M氫氧化鈉水溶液中經過鹼性穩定性測試後,其傳導率在168小時後下降至10.16與17.51 mS/cm。而PES-DM-0.8QA、PES-DM-1.4QA及PES-DM-1.8QA在60 oC之陰離子傳導率分別為2.53、13.33、29.35 mS/cm,在80 oC下分別為5.97、25.29及51.40 mS/cm。
Novel diol monomer 2,2’-dimethyl-4,4’-biphenyldiol was successfully synthesized via diazotization and hydrolysis from 2,2’-dimethyl-4,4’-biphenyldiamine (m-Tolidine). Novel polyethersulfone PES-DM were synthesized from 2,2’-dimethyl-4,4’-biphenyldiol and dichlorodiphenyl sulfone using DMAc as reaction solvent. PES-DM was brominated by N-bromosuccinimide (NBS) benzyl peroxide (BPO). Number-averaged molecular weight measured by GPC of PES-DM and PES-DM-Br were both around 100 KDa meaning there was no cleavage in the main chain of PES-DM after bromination. On the other hand, PES-DM-Br showed a chiral property due to the limited rotation of bulky substituent. We calculated the rotation barrier of single bromomethyl PES-DM and double bromomethyl PES-DM by DFT theory exhibiting 76.34 and 78.58 KJ/mol , respectively. PES-DM-Br were quaterized by 1-methyl piperidine(PES-DM-MP)、1,2-dimethyl imidazole(PES-DM-DI) and trimethyl amine(PES-DM-QA), They were then immersed in 1M NaOH solution at 80 oC to determine their alkaline stability. PES-DM-QA exhibited the most outstanding alkaline stability so we varied it’s IEC value from 0.8 to 1.8 mmol/g assigning for PES-DM-0.8QA, PES-DM-1.4QA and PES-DM-1.8QA, respectively. No weight loss was detected before 100 oC. Demonstrated great thermal stability for alkaline anion exchange membrane. Alkaline stability were tested in 1 M NaOH solution at 60 oC for 168 hr. PES-DM-1.4QA and PES-DM-1.8QA showed 10.16 and 17.51 mS/cm in conductivity. Conductivity of PES-DM-0.8QA, PES-DM-1.4QA, PES-DM-1.8QA at 60 oC were 2.53、13.33 and 29.35 mS/cm, respectively, and were 5.97、25.29 and 51.40 at 80 oC, respectively.
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