Minowa Yu, Yabuuchi Yuta, Nagano Shusaku, Nagamatsu Shuichi, Fujii Akihiko, Ozaki Masanori
Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka565-0871, Japan.
College of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo171-8501, Japan.
ACS Appl Mater Interfaces. 2022 Oct 25. doi: 10.1021/acsami.2c13516.
A fast meniscus-guided coating for ultrahighly oriented thin films of a typical donor-acceptor π-conjugated polymer, poly2,5-(2-octyldodecyl)-3,6-diketopyrrolopyrrole--5,5-(2,5-di(thien-2-yl)thieno[3,2-]thiophene) was realized. A coating speed higher than 100 mm/s, which was regarded as a Landau-Levich regime, was applicable. The 2D order parameter () of the thin films changed by selecting the solvent and adjusting the initial concentration of the solution, and the large elongated rodlike preaggregates formed particularly in chlorobenzene contributed to the high orientation in the solid film state, resulting in the highest value of = 0.87. Focused on the PDPP-DTT preaggregate formation in the solution, the SAXS analysis was carried out to investigate the shape and size of the preaggregates. The mechanism of the molecular orientation was discussed by taking the preaggregates and the solution flow under the coating process into account.
实现了一种用于典型供体-受体π共轭聚合物聚2,5-(2-辛基十二烷基)-3,6-二酮吡咯并吡咯-5,5-(2,5-二(噻吩-2-基)噻吩并[3,2-b]噻吩)超高度取向薄膜的快速弯月面引导涂层。高于100 mm/s的涂层速度是适用的，这被视为朗道-列维奇区域。通过选择溶剂和调节溶液的初始浓度，薄膜的二维有序参数()发生变化，特别是在氯苯中形成的大的细长棒状预聚集体有助于在固体薄膜状态下实现高取向，从而得到= 0.87的最高值。聚焦于溶液中PDPP-DTT预聚集体的形成，进行了小角X射线散射(SAXS)分析以研究预聚集体的形状和尺寸。通过考虑预聚集体和涂层过程中的溶液流动，讨论了分子取向的机制。
