To improve alignment of isoindigo-based conjugated polymer film by controlling contact line receding velocity
To improve alignment of isoindigo-based conjugated polymer film by controlling contact line receding velocity
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DOI：
10.1016/j.cclet.2017.05.021
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发表时间：
2017-08
影响因子：
9.1
通讯作者：
S. Chi;Liang Chen;Hongxiang Li;Jiangang Liu;Xinhong Yu;Yanchun Han
中科院分区：
文献类型：
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作者：
S. Chi;Liang Chen;Hongxiang Li;Jiangang Liu;Xinhong Yu;Yanchun Han
低晶界共轭聚合物的宏观取向对载流子输运至关重要。在成膜过程中，接触线后退速度与临界取向速度的匹配是获得取向聚合物膜的关键。本文通过调节溶剂蒸气含量和成膜温度来调节异靛-联噻吩（IIDDT-C3）D-A共轭聚合物膜的接触线后退速度。只有当溶剂蒸气含量为0.3 mL，成膜温度为90 °C时，接触线的后退速度才符合临界取向速度，且IIDDT-C3膜的取向度最高，二色性比达到4.08。纤维平行于接触线后退的方向排列，并且IIDDT-C3的分子采用侧边取向，主链平行于纤维长轴方向。相邻分子之间的π-π堆积距离为3.63 π。
The macroscopic alignment of conjugated polymers with low grain boundary is essential to carrier transport. During film forming process, the match between contact line receding velocity and the critical alignment velocity is essential to get the alignment polymer film. In this paper, the contact line receding velocity of a D-A conjugated polymer film, isoindigo and bithiophene (IIDDT-C3), was adjusted by solvent vapor content and film-formation temperature. Only when solvent vapor content was 0.3 mL and the film-formation temperature was 90 °C, the contact line receding velocity was in accordance with the critical alignment velocity, and the highest degree of alignment was attained in the IIDDT-C3 film, with the dichroic ratio up to 4.08. Fibers were aligned parallel with the direction of the contact line receding and the molecules of IIDDT-C3 adopted an edge-on orientation with the backbone parallel with the direction of fiber long axis. Theπ-πstacking distance between adjacent molecules was 3.63 Å.