Formation of single-crystal-like poly(9,9-dioctylfluorene) thin film by the friction-transfer technique with subsequent thermal treatments
Formation of single-crystal-like poly(9,9-dioctylfluorene) thin film by the friction-transfer technique with subsequent thermal treatments
复制标题
DOI：
10.1021/ma049051x
复制
发表时间：
2004-09-07
期刊：
影响因子：
5.5
通讯作者：
Yase, K
中科院分区：
文献类型：
--
作者：
Misaki, M;Ueda, Y;Yase, K
通过摩擦转移技术发现液晶聚合物聚(9，9-二辛基荧烯)(PFO)能够形成高度取向的薄膜。所形成的薄膜的偏振UV-Vis吸收光谱和光致发光光谱显示出很强的二向色性，在摩擦转移的拉伸方向上的二向色性比约为10。随后对摩擦转移的PFO薄膜进行热处理，特别有效地改善了薄膜的物理性能、结构和形貌。通过从摩擦转移膜的液晶熔融状态快速冷却和缓慢冷却，分别制备了液晶薄膜和晶态薄膜。两种热处理的薄膜在光致发光光谱中都表现出增强的光学各向异性，二向色性比约为25。晶态薄膜的电子衍射图显示出与单晶相同的大量锐利的衍射点。通过摩擦转移技术和随后的热处理，发现液晶聚合物形成了类似单晶的薄膜。
A liquid-crystalline polymer, poly(9,9-dioctylfluorene) (PFO), was found to form highly oriented films by a friction-transfer technique. The polarized UV-vis absorption and photoluminescence spectra of the films formed showed strong dichroism with a dichroic ratio of approximately 10 in the drawing direction of friction transfer. Subsequent thermal treatments of the friction-transferred PFO films were specifically effective for the improvement of the physical properties, structure, and morphology of the films. By rapid and slow cooling from the liquid-crystalline melted states of the friction-transferred films, liquid-crystalline and crystalline films were prepared, respectively. Both thermally treated films showed enhanced optical anisotropy with a dichroic ratio of approximately 25 in photoluminescence spectra. The electron diffraction pattern of the crystalline film showed a large number of sharp diffraction spots as seen in a single crystal. The liquid-crystalline polymer was found to form a single-crystal-like thin film by the friction-transfer technique with subsequent thermal treatments.