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研究生:邱垂凱
研究生(外文):Chiu-Kai Chiu
論文名稱:電紡奈米聚乙烯醇纖維/Nafion複合膜製備及性質研究
論文名稱(外文):Fabrication and characterization of electrospum polyvinyl alcohol nano-fiber / Nafion composite membranes
指導教授:林秀麗林秀麗引用關係
指導教授(外文):Hsiu-Li Lin
學位類別:碩士
校院名稱:元智大學
系所名稱:化學工程與材料科學學系
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:95
中文關鍵詞:聚乙烯醇電紡燃料電池
外文關鍵詞:polyvinyl alcoholPVA 、electrospinning、Nafion
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本論文將聚乙烯醇(polyvinyl alcohol,PVA)水溶液利用電紡技術(electrospinning)抽絲成膜。PVA奈米纖維經由化學交聯增加機械強度,再將電紡後PVA薄膜浸漬不同濃度Nafion溶液製作複合膜。利用熱分析儀器TGA、DMA、TMA等觀察此複合膜各項高分子物性,用SEM觀察在浸漬不同濃度Nafion溶液下,複合膜的表面及截面型態,再利用恆電位儀、頻率應答分析儀來測出複合膜材的電阻抗,最後利用單電池測試系統測試複合膜製成之MEA燃料電池效能。
結果顯示,複合膜厚度35~40um與Nafion 112 ( 50 um)的機械特性最大應力數值接近,且複合膜有較低的阻抗值,DMFC單電池測試時開路電位為0.6V,但無效能,可能複合膜尚有孔洞造成的結果。
In this study, polyvinyl alcohol (PVA) nano-fiber membranes were fabricated by Electrospinning of PVA aqueous solution. Then, the mechanical strength of PVA nano-fiber membranes were improved via chemical crosslink process. Finally, the PVA/Nafion composite membranes were obtained by immersing PVA nano-fiber membranes into various concentration of Nafion solution.
The properties of PVA nano-fiber membranes were investigated by TGA, DMA, FTIR SEM and TMA. The results indicated that the grass transition temperature of PVA nano-fiber membranes increased with increasing the density of crosslink; the more crosslink present, the larger was the stress and the smaller was the amount of elongation.
The related performance of PVA/Nafion composite membranes and Nafion 112 in fuel cell was compared. The open-circuit voltage and conductivity of PVA/Nafion composite membranes were higher than those of the Nafion 112. Nevertheless, the I-V curve of PVA/Nafion composite membranes can not be obtained in DMFC test. The lower performance of PVA/Nafion composite membranes in DMFC test was ascribed to the existence of porosity in them.
一. 序論…………………………………………………………………1
1.1 前言…………………………………………………………………1
1.2 燃料電池簡介………………………………………………………3
1.2.1 發電原理及構造…………………………………………………3
1.2.2 質子交換膜的性能要求…………………………………………6
1.3 電紡技術(Electrospinning)簡介………………………………7
1.4 聚乙稀醇(polyvinyl alcohol,PVA)簡介……………………10
1.5 全氟磺酸化樹酯(Nafion)簡介…………………………………11
1.6 研究目的……………………………………………………………14
1.7電紡纖維文獻回顧…………………………………………………15
1.7.1 穩定的電紡絲程序……………………………………………15
1.8.1影響電紡絲纖維形態之參數……………………………………17
二. 實驗…………………………………………………………………26
2.2 儀器設備……………………………………………………………27
2.1 藥品…………………………………………………………………26
2.3實驗步驟……………………………………………………………29
(A) PVA電紡溶液製備……………………………………………29
(B) PVA電紡纖維製作……………………………………………30
(C) 電紡PVA薄膜交聯步驟………………………………………30
(D) 電紡PVA薄膜性質測試………………………………………32
(i) ATR-FTIR 全反射式傅立葉轉換紅外光光譜測試…………32
(ii)掃描式電子顯微鏡 (Scanning Electronic Microscopy)………32
(iii)熱重分析儀(Thermogravimertic Analyzer, TGA)……………32
(iv)動態機械分析儀(Dynamic Mechanical Analysis, DMA )……33
(v)纖維膜機械特性分析(Mechanical properties Analyzer)………33
(vi)電紡纖維膜不同交聯程度與水、甲醇溶解測試……………33
(E) 交聯後電紡纖維薄膜PVA/Nafion複合膜製備……………..33
(F) PVA/Nafion複合膜性質測試…………………………………34
(i)掃描式電子顯微鏡 (Scanning Electronic Microscopy)………34
(ii)熱機械分析儀( Therm mechanical Anlyzer,TMA)…………34
(iii)質子傳導率測定………………………………………………34
(G) PVA/Nafion複合膜DMFC測試…………………………………35
(i)觸媒漿料製備…………………………………………………35
(ii)MEA製備……………………………………………………...35
(iii)DMFC測試……………………………………………………36
三.結果與討論…………………………………………………………42
3.1 PVA電紡奈米纖維( SEM )分析…………………………………42
3.2 PVA電紡奈米纖維不同交聯程度( SEM )分析…………………42
3.3.PVA電紡奈米纖維不同交聯程度機械特性………………………44
3.4.PVA電紡奈米纖維不同交聯程度與水、甲醇相溶性測試………53
3.4-1電紡纖維不同交聯程度與常溫下的水相溶性測試……………53
3.4-2電紡纖維不同交聯程度與80o C的水相溶性測試……………59
3.4-3電紡纖維不同交聯程度與沸騰甲醇相溶性測試………………65
3.5 PVA電紡纖維膜不同交聯程度FTIR-ATR 分析…………………69
3.6 熱重分析儀( Thermogravimetric Analyzer,TGA)熱穩定分析………………………………………………………………………73
3.7電紡纖維不同交聯程度動態黏彈性機械(DMA)分析……………77
3.8 Nafion/PVA複合膜製作方式測試………………………………81
3.9 Nafion-112膜與Nafion/PVA複合膜機械特性比較……………86
3.10 Nafion/TMA複合膜熱機械性質(TMA)分析……………………88
3.11 質子傳導率與DMFC測試………………………………………90
四.結論…………………………………………………………………91
五. 參考文獻…………………………………………………………92
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