Aggregation of Conjugated Polymers in Solution State Modulated by the Addition of n-Alkanes

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研究生：	劉夢涵 Liu, Meng-Han
論文名稱：	Aggregation of Conjugated Polymers in Solution State Modulated by the Addition of n-Alkanes
指導教授：	陳信龍 Chen, Hsin-Lung
口試委員:
學位類別：	碩士 Master
系所名稱：	工學院 - 化學工程學系 Department of Chemical Engineering
論文出版年：	2010
畢業學年度：	98
語文別：	英文
論文頁數：	77
中文關鍵詞：	共軛高分子
外文關鍵詞：	conjugated polymer, aggregation
相關次數：	點閱：2 下載：0
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For PFO, the aged PFO/toluene/nonane solution composes of the PFO-enriched phase and the isotropic phase due to the macrophase separation upon aging. The degree of microphase separation increased with increasing nonane content due to reduction of solvent quality. The PFO-enriched phase is mesomorphic, consisting of the ribbon-like aggregates. A fraction of the PFO chains/segments forming ribbon-like aggregates adopt the β-conformation, which further organize to form a layer-by-layer structure of β-phase. The promotion of gelation of PFO solution by adding nonane should be driven principally by a macrophase separation process that leads to highly interconnected domains arrested during the phase separation process. Moreover, the β-phase (Cβ) in solution can be transferred to films prepared from the solution.
For MEH-PPV, it present as components of rod-like segments in toluene solution and construct a mass fractal aggregates. However, in the MEH-PPV/toluene solution with addition of nonane, the MEH-PPV segments can be compact to form the dimmer aggregates. In solution, more aggregates formed and mesomorphic phase developed for aged MEH-PPV/toluene solution with nonane. In film at room temperature, addition of nonane can induce mesophase in cast film from fresh solution but inhibit that in cast film from aged solution. It is proposed the serious aggregation behavior in the aged solution with nonane transfers to the films and affects the formation of mesophase in the films. Upon heating, the aggregates are destroyed and the more mesophase was formed in the films. It is suggested the dimmer aggregates formed through addition of nonane and aged effect in solution are the nuclei of mesophase. After casting the film from the solution, the mesophase can be induced from the dimmer aggregates upon heating.

Catalogue
Abstract    I
Catalogue    II
Figure    IV
Table    VII
Chapter 1 Introduction    1
Chapter 2 Literature Review    2
2-1 An overview of conjugated polymers    2
2-2 Aggregation and energy transfer of conjugated polymers based on photophysical property studies    5
2-3 Most common conjugated polymer systems: PFO and MEH-PPV    12
2-3-1 Polyfluorene (PFO)    12
2-3-2 Poly[2-methoxy-5-(2’-ethylhexyloxy)- 1,4-phenylene vinylene] (MEH-PPV)    18
2-4 Gelation behavior of conjugated polymers    23
Chapter 3 Research motivation and objective    25
Chapter 4 Experimental section    27
4-1 Material and sample preparation    27
4-2 Characterizations    29
Chapter 5 Results and Discussions    30
5-1 Studies of PFO/toluene solution with addition of nonane    30
5-1-1 Photophysical properties of solution    30
5-1-2 Analysis of PFO solution structure    36
5-1-4 Photophysical properties and phases transformation of PFO films cast from the solution with and without nonane    51
5-2 Studies of MEH-PPV/toluene solution with addition of nonane    57
5-2-1 Photophysical properties of MEH-PPV solutions    57
5-2-2 Analysis of the structures of MEH-PPV solution    62
5-2-3 Photophysical properties of MEH-PPV cast films    64
5-2-4 Morphology of MEH-PPV films    67
Chapter 6 Conclusion    71
References    75

                                

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