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題 名 | 以SAXS探討不同分子量MEH-PPV在溶液態的結構形態=The SAXS Study on the Morphology of Different Molecular Weights' MEH-PPV in Solution State |
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作 者 | 許政偉; 李欣怡; 彭世將; 曾清桂; 歐陽文忠; |
書刊名 | 高雄應用科技大學學報 |
卷 期 | 39 2010.05[民99.05] |
頁 次 | 頁43-77 |
分類號 | 448.552 |
關鍵詞 | 高分子發光二極體; 小角度X光散射; 形態; MEH-PPV; PLED; SAXS; Conformation; |
語 文 | 中文(Chinese) |
中文摘要 | 高分子發光二極體由溶液態形成固態膜時,兩者之形態結構有密切關係,固態膜的結構形態或多或少會"記憶"或"承襲"溶液態時的結構與形態。本研究針對不同分子量之電致發光高分子,聚2-甲氧基-5-(2′-乙基-己氧基)-1,4-苯乙烯[poly(2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylenevinylene),MEH-PPV],溶解於四氫呋喃及甲苯,配置成不同濃度,利用小角度X 光散射(small angel x-ray scattering,SAXS),藉由Igor 軟體配合高分子模型公式,擬合高分子鏈的不同形態,在高散射向量(high-q)範圍,MEH-PPV 溶在THF 及toluene 溶劑中,分子鏈聚集的形態介於盤狀與橢球之間的聚集體;在低散射向量(low-q)區間,利用Guinier law 解析聚集體的平均迴旋半徑<Rg> (average radius of gyration),MEH-PPV 分子鏈溶在甲苯者,在高濃度及高分子量下,平均迴旋半徑<Rg >比溶在四氫呋喃者較小,此乃芳香族甲苯溶劑較親近MEH-PPV 分子鏈的苯乙烯主鏈,可以有效減少主鏈間的聚集而增加側鏈醚基的聚集所導致。 |
英文摘要 | Because of the significant relationship between the conformation structure of semi-conducting polymer in solution state and the conformation structure of solid membrane state. The solid membrane has construction conformations by more or less inherited from the solution state. This research was based on electroluminescent semiconducting polymer MEH-PPV [poly (2-methoxy -5-(2′-ethyl-hexyloxy)-1,4-phenylene-vinylene)] of different molecular weights which were dissolved in two solvents both THF and toluene separately and the concentration ranging from 0.1 to 0.5wt%, we observe global chain conformation of solution state of MEH-PPV by small angle x-ray scattering (SAXS) and by means of Igor software to simulate the polymer chain conformation in order to gain a clear picture of the molecular conformation structure in solution state, and expect to be able to find a way to tune the photoelectric and photophysical characteristics. The SAXS experiments demonstrate in high-q region the structure of the conjugated polymer MEH-PPV in THF solution seems to exhibit the shapes between disk or ellipsoid conformation but the latter is preferred than the former; whereas in low-q region, Guinier method was used to analyze the radius of gyration <Rg> of the polymer chain, in room temperature despite different molecular weight, the radius of gyration for those dissolved in THF are larger than those in toluene due to that toluene shows a strong affinity to the main chain of MEH-PPV, hence the aggregation among the main chains was restrained, and by contrast, the side chains’ aggregation was liberated. |