雙親性共軛高分子之合成與性質鑑定

Abstract

在共軛高分子的領域中，主鏈的排列方式對有機光電元件有相當重要的影響。不少研究從烷基和矽氧烷基側鏈的調控著手，但寡醚基側鏈的發展相對較少。因寡醚基親水的特性，對極性溶劑甚至是水溶液的製程有很大的潛力。此外，高分子主鏈間的作用力亦預期受到親水性寡醚基團的影響。在本研究中，我們成功合成具有寡醚基側鏈的雙親性共軛高分子及其烷基對照組。寡醚基側鏈顯著地影響了高分子薄膜表面的親疏水特性，然而該側鏈對光學性質和電化學性質的影響仍須考慮到主鏈結構之不同。最重要的影響來自薄膜形態上的轉變：由三噻吩和異靛藍素共聚的高分子在退火處理後呈現了面堆疊的形態；由三噻吩和噻吩并噻吩并（口比）（口各）二酮共聚的高分子呈現了特殊的六角柱狀結構。我們推測這樣的轉變是由於寡醚基和烷基側鏈的排斥力，以及主鏈特殊的構形所致。

In the area of conjugating polymers, how polymer main chain might be packed in thin film is critical for the performance of organic (opto)electronic devices. Some efforts were made by modulating alkyl substituents or introducing siloxane-terminated side group, while usage of oligoether side chain has been less developed. The hydrophilic nature of oligoether, which differs from hydrophobic alkyl substituents, has potential for solution processing using polar solvents like water. Besides, the interaction between polymer backbones might be influenced in the presence of oligoether. In this study, we successfully synthesized amphiphilic conjugating polymers with tri(ethylene glycol) (TEG) substituents and alkyl substituents analogues. The TEG side chain substantially changed the hydrophilicity of polymer film, but the influence on optical properties and electrochemical response depended on the main chain structure. Most importantly, the texture of polymer films was changed with the incorporation of TEG. Upon annealing, polymer composed of alternating terthiophene and isoindigo exhibited face-on orientation, while polymer comprised of terthiophene and thieno[3,4-c]pyrrole- 4,6-dione(TPD) adopted unique hexagonal cylinder morphology. We contributed the morphological changes to the repulsion of two immiscible side chains, with appropriate conformation of main chain.