Nafion是目前廣泛地使用在燃料電池上的一種全氟磺酸質子交換膜。雖然Nafion在燃料電池的應用上仍有許多的問題尚未克服，但其應用在燃料電池上之優越質子傳導能力仍是無法被完全取代的主因之一。現今已有許多的研究藉由修改Nafion的化學結構或找尋其他可以取代Nafion的質子交換材料，但如何進一步提高Nafion的質子傳導率以及抵抗劣化，增加使用壽命，也是重要的研究方向。
本次工作將Nafion薄膜浸泡在聚乙二醇（PEG）溶液中使PEG進入Nafion薄膜中。藉由改變溶液濃度及不同PEG的分子量，作出一系列的靜態及魔角旋轉固態1H NMR實驗，並且使用變溫、變場等實驗方式，獲得不同溫度、不同濃度及不同大小的PEG下之1H光譜以及縱向鬆弛速率（R1）。將所獲取的資料進行分析，可以得到有關Nafion中PEG與水之交互作用之資訊，且有助於探討薄膜微孔受PEG的影響。例如，Nafion薄膜在浸泡過較高濃度的PEG溶液後，薄膜內的水化學位移較未加PEG的情形會減小，其T1要較未加PEG的情形為長，同時隨浸泡的PEG溶液濃度的下降薄膜水化學位移隨之左移且T1也會隨之下降。最後透過交流阻抗儀測量添加PEG分子之Nafion的質子傳導率，我們得到了隨添加濃度上升質子傳導率會隨之下降，而綜合這項結果與固態NMR的量測數據為日後進一步的改善Nafion質子交換薄膜實驗提供了一個明確的指標。

Nafion has been the mostly used perfluorosulfonated proton exchange membrane (PEM) in fuel cell. Although a number of problems remain to be resolved on the application of Nafion as a PEM, a less expensive alternative PEM has not been found mainly because of its high proton conductivity. Therefore, much effort has been invested to modify it or find a better and inexpensive material. The exploration of the methods to counter degradation and aging of Nafion is also an important direction of research. In this work, the behavior of PEG in Nafion is investigated with solid state NMR spectroscopy. A series of samples with different PEG sizes and concentrations in Nafion was prepared and the variable temperature proton spectra and longitudinal relaxation times (T1) were measured on two spectrometers. Some interesting findings were made, e.g., the 1H chemical shift of water in concentrated PEG solution decrease while its T1 increase, the higher the concentration of PEG, the larger the increase (of water 1H chemical shift) or decrease (of water 1H T1). These findings provide valuable information on further improving the performance of Nafion in proton conductivity and durability.

第一章 緒論
1.1前言 1
1.2質子交換膜Nafion介紹 6
1.3研究動機 9
第二章 核磁共振簡介
2.1核磁共振的發展 11
2.2基本理論 12
2.3 NMR鬆弛（Relaxation） 15
2.3.1縱向鬆弛（longitudinal relaxation） 16
2.3.2橫向鬆弛（transverse relaxation） 19
2.4固態核磁共振原理 21
2.4.1 Zeeman作用力 22
2.4.2化學位移各向異性（chemical shift anisotropy，CSA） 22
2.4.3偶極—偶極交互作用 23
2.4.4 J—偶合（J-coupling） 24
2.4.5四極核作用力（quadrupolar interaction） 24
2.4.6魔角旋轉（Magic-angle-spinning，MAS） 25
2.5轉動活化能 26
第三章 交流阻抗分析儀介紹
3.1交流阻抗分析儀（AC-Impedance）實驗原理 27
3.1.1直流測量法 27
3.1.2交流阻抗法 29
3.2等效電路（Equivalent Circuit） 36
第四章 實驗部分
4.1實驗材料 40
4.2樣品前處理及藥品配製 40
4.3實驗儀器及裝置 41
4.4實驗參數設置 41
第五章 結果與討論
5.1 PEG水溶液1H NMR測量 44
5.2添加PEG之Nafion 1H魔角旋轉3 kHz 固態NMR測量 50
5.3添加PEG之Nafion 1H靜態固態NMR測量 59
5.4交流阻抗分析儀測量 70
第六章 結論 74
參考文獻 75

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