臺灣博碩士論文加值系統

共軛高分子在溶液中易形成聚集體，進而影響成膜後的發光性質。本研究希望利用實驗室自行架設之多角度動、靜態光散射量測系統及螢光光譜儀，對聚2-甲氧基-5-（2’-乙基-己氧基）對苯乙烯 (MEH-PPV) 溶液進行系統性的分析。主要探討MEH-PPV溶於甲苯 （相對貧溶劑） 及氯仿 （相對良溶劑）所形成的聚集結構。變因有三，分別為不同濃度、靜置時間以及熱處理，探討此三變因會如何影響MEH-PPV在兩種不同溶劑的聚集行為。我們發現，MEH-PPV 聚集體大致可分為兩種，一種是中型的聚集體（約數十到近百奈米），另一種是大聚集體（約幾微米）。大聚集體很容易由動態光散射檢測出來，然而靜態光散射可提供的是中聚集體的結構特色。此外，我們結合動、靜態光散射得到中聚集體的緊密程度隨濃度、靜置時間以及熱處理的變化，發現趨勢能和螢光光譜上所得結果互相印證。最後，由去極化動態光散射可知，所有樣品中的聚集體皆沒有明顯的非球形對稱結構出現。

Conjugated polymers have received much interest due to their unique photophysical properties. Previous light scattering studies have indicated that these polymers tend to form interchain aggregation in solution state even at large dilution. We report the results of dynamic light scattering (DLS), static light scattering (SLS), and photoluminescence (PL) for poly(2-methoxy-5-(2’-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV) in toluene or chloroform. The effects of concentration, aging, and thermal treatment on the aggregation properties were explored. Two different types of MEH-PPV aggregates in solution have been identified. The first is concerned with medium-sized aggregates (i.e., generally below several hundred nanometers in hydrodynamic radius), and the other is for micrometer-sized aggregates (i.e., generally above several micrometers). The presence of large aggregates can be detected readily by DLS, while the structural properties of the medium-sized aggregates may be obtained by SLS. By combining the DLS and SLS results, we found that the compactness of the medium-sized aggregates change with polymer concentration, aging times, and thermal treatment, as also verified by photoluminescence spectra. Finally, depolarized dynamic light scattering (DDLS) suggested that the aggregate shape is largely spherical-like.

1.謝辭
2.摘要
3.Abstract
4.目錄
5.圖目錄
6.表目錄
7.第一章 緒論
8.第二章 實驗部分
9.第三章 結果與討論
10.第四章 結論
11.參考文獻
12.附錄

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