| 研究生: |
何永盛 Ho, Wing-Shing |
|---|---|
| 論文名稱: |
含聚乙烯醚及聚丙烯醚鏈環氧樹脂型高分子電解質之製備與其特性探討 |
| 指導教授: |
黃文亮
Huang, Wen-Liang |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學系碩士在職專班 Department of Chemistry (on the job class) |
| 論文出版年: | 2005 |
| 畢業學年度: | 93 |
| 語文別: | 中文 |
| 論文頁數: | 42 |
| 中文關鍵詞: | 固態核磁共振光譜 、環氧基 、聚醚 、高分子電解質 |
| 外文關鍵詞: | polymer electrolytes, polyether, epoxide, 7Li MAS NMR |
| 相關次數: | 點閱:72 下載:2 |
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摘 要
本研究製備之高分子電解質薄膜係以含聚乙烯醚之環氧樹脂((polyethylene glycol) diglycidyl ether, PEGDE)與雙氨基聚乙烯醚/聚丙烯醚(poly(oxyethylene) diamine, PEDA)及單氨基聚乙烯醚/聚丙烯醚(poly(oxyethylene) monoamine, PEMA),在鋰鹽(LiClO4)的存在下加熱進行交鏈反應而得。藉由FT-IR、固態13C CP/MAS NMR鑑定其結構與反應。所得之高分子電解質以不銹鋼為電極,利用交流阻抗分析法(ac-impedance)測量其離子導電度,並探討溫度、鋰鹽濃度、雙氨基/單氨基聚醚比例對其離子導電度之影響。藉由DSC可得知高分子之熱轉移(thermal transition)性質,有助於分析其對離子導電度之影響;透過TGA分析得知各高分子及其錯合物(complexes)之熱穩定性。藉由FT-IR與7Li之魔術轉角(MAS)固態核磁共振光譜分析鋰離子於高分子電解質中之作用力(interaction)環境變化。
Abstract
A series of crosslinked polyether-based polymers and their complexes with LiClO4 have been prepared and characterized by FT-IR and solid-state NMR (13C and 7Li nucleus). Significant coordination interactions between ions and the host polymer have been observed by means of differential scanning calorimeter (DSC), FT-IR, 7Li magic angle spinning (MAS) NMR, thermogravimetric analysis (TGA). All events refer that Li-ions preferentially occupy the amine crosslinking sites until saturated, and then the excess Li-ions coordinate with the polyether chain segments. The results of 7Li MAS NMR reveal that Li-salt comes into being ion pairs or aggregates at high Li-salt concentrations, also supported by the consequences of DSC and FT-IR. These phenomena crucially affect the conductivity of the polymer electrolytes. The dependence of ionic conductivity was investigated as functions of temperature, LiClO4 concentration and various the crosslinking density by substitute PEMA for PEDA, and the results were studied to acquire the information of Li-ion transport. The results show that the conduction behavior of the complexes obeys VTF manners throughout the temperature range, suggesting the coordinated motion model of the ionic hopping with the moving polymer chain segment.
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