Pan Xiaolu, Li Hongwei, Zhang Xinping
Institute of Information Photonics Technology and College of Applied Sciences, Beijing University of Technology, Beijing 100124, China.
Advanced Nano-Materials Division, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou 215123, China.
Polymers (Basel). 2017 Aug 11;9(8):356. doi: 10.3390/polym9080356.
Polyfluorene and its derivatives have been recognized as efficient light-emitting semiconductors. However, directional alignment of polyfluorene copolymers at a large scale has rarely been observed, in particular for the two relatively more amorphous members of poly-9,9-dioctylfluorene-co-bethiadisazole (F8BT) and poly-(9,9-dioctylfluorenyl-2,7-diyl)--(,0-diphenyl)-,'di(p-butyl-oxy-pheyl)-1,4-diamino-benzene) (PFB) molecules. Furthermore, the directional alignment of PFB has not been observed so far due to the triphenylamine units in its molecular structures. We present, in this work, a solution-processible method to achieve large-scale alignment of F8BT and PFB molecules into fibers as long as millimeters in a defined direction. Spin-coating the polymer film on to a glass substrate patterned by one-dimensional dielectric nano-grating structures through interference lithography and subsequent modification using 1,5-pentanediol have been used in all of the preparation procedures. Polymer fibers have been obtained in an arrangement parallel to the grating lines. The microscopic, spectroscopic, and photoconductive performances verified the formation and the quality of these directionally-aligned polymeric fibers.
聚芴及其衍生物已被公认为高效发光半导体。然而，聚芴共聚物的大规模定向排列很少被观察到，特别是对于聚-9,9-二辛基芴-共-苯并噻二唑（F8BT）和聚（9,9-二辛基芴基-2,7-二亚基）-（，0-二苯基）-，'二（对丁氧基苯基）-1,4-二氨基苯（PFB）这两种相对更无定形的分子。此外，由于其分子结构中的三苯胺单元，PFB的定向排列至今尚未被观察到。在这项工作中，我们提出了一种溶液可加工的方法，以实现F8BT和PFB分子在特定方向上大规模排列成毫米长的纤维。在所有制备过程中，均采用通过干涉光刻在由一维介电纳米光栅结构图案化的玻璃基板上旋涂聚合物薄膜，并随后使用1,5-戊二醇进行改性。已获得与光栅线平行排列的聚合物纤维。微观、光谱和光电导性能验证了这些定向排列的聚合物纤维的形成和质量。
