Influence of the Casting Solvent on the Thermotropic Alignment of Thin Liquid Crystalline Polyfluorene Copolymer Films
Influence of the Casting Solvent on the Thermotropic Alignment of Thin Liquid Crystalline Polyfluorene Copolymer Films
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DOI：
10.1021/ma035775h
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发表时间：
2004-07
期刊：
影响因子：
5.5
通讯作者：
M. Banach;R. Friend;H. Sirringhaus
中科院分区：
文献类型：
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作者：
M. Banach;R. Friend;H. Sirringhaus
共轭聚合物薄膜的形态决定了它在光电器件中作为有源层的表现。某些共轭聚合物中存在的液晶相提供了一种控制膜形态的独特方法。例如，可以通过在模板层上加工薄膜并在聚合物的液晶熔点以上退火来制造链在单一方向上排列的薄膜。然而，与模板层对齐的能力将受到铸膜特性的影响。通过在摩擦的聚酰亚胺层上浇铸聚（9,9-二辛基芴-共苯并噻唑）（F8BT）薄膜，并通过热致性熔体对正，研究了这种效应。二向色比作为退火时间的函数的测量表明，由高沸点芳香溶剂如异二烯（ISO）和邻二甲苯（OXY）浇铸的薄膜排列良好，最大二向色比大于10。电影……
The morphology of a conjugated polymer thin film determines how it will behave as an active layer in optoelectronic devices. The liquid crystalline phase present in some conjugated polymers offers a unique way of controlling the film morphology. For example, films in which the chains are aligned in a single direction can be fabricated by processing films on a templating layer and annealing them above the liquid crystalline melting point of the polymer. However, the ability to align to a templating layer will be influenced by the character of the as-cast film. This effect was examined by casting poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) films from a range of both aromatic and chlorinated solvents on top of rubbed polyimide layers and aligning via the thermotropic melt. Measurements of the dichroic ratio as a function of annealing time revealed that films cast from high boiling point aromatic solvents like isodurene (ISO) and o-xylene (OXY) aligned well with a maximum dichroic ratio over 10. Film...