Zokaei Sepideh, Kroon Renee, Gladisch Johannes, Paulsen Bryan D, Sohn Wonil, Hofmann Anna I, Persson Gustav, Stamm Arne, Syrén Per-Olof, Olsson Eva, Rivnay Jonathan, Stavrinidou Eleni, Lund Anja, Müller Christian
Department of Chemistry and Chemical Engineering Chalmers University of Technology Göteborg 41296 Sweden.
Laboratory of Organic Electronics Department of Science and Technology Linköping University Norrköping 60174 Sweden.
Adv Sci (Weinh). 2020 Dec 11;8(2):2002778. doi: 10.1002/advs.202002778. eCollection 2021 Jan.
Polar polythiophenes with oligoethylene glycol side chains are exceedingly soft materials. A low glass transition temperature and low degree of crystallinity prevents their use as a bulk material. The synthesis of a copolymer comprising 1) soft polythiophene blocks with tetraethylene glycol side chains, and 2) hard urethane segments is reported. The molecular design is contrary to that of other semiconductor-insulator copolymers, which typically combine a soft nonconjugated spacer with hard conjugated segments. Copolymerization of polar polythiophenes and urethane segments results in a ductile material that can be used as a free-standing solid. The copolymer displays a storage modulus of 25 MPa at room temperature, elongation at break of 95%, and a reduced degree of swelling due to hydrogen bonding. Both chemical doping and electrochemical oxidation reveal that the introduction of urethane segments does not unduly reduce the hole charge-carrier mobility and ability to take up charge. Further, stable operation is observed when the copolymer is used as the active layer of organic electrochemical transistors.
带有低聚乙二醇侧链的极性聚噻吩是极其柔软的材料。低玻璃化转变温度和低结晶度使其无法用作块状材料。本文报道了一种共聚物的合成，该共聚物包含1）带有四甘醇侧链的柔软聚噻吩嵌段，以及2）坚硬的聚氨酯链段。这种分子设计与其他半导体 - 绝缘体共聚物相反，后者通常将柔软的非共轭间隔基与坚硬的共轭链段结合在一起。极性聚噻吩与聚氨酯链段的共聚产生了一种韧性材料，该材料可用作独立的固体。该共聚物在室温下的储能模量为25兆帕，断裂伸长率为95%，并且由于氢键作用，溶胀程度降低。化学掺杂和电化学氧化均表明，聚氨酯链段的引入不会过度降低空穴电荷载流子迁移率和电荷吸收能力。此外，当该共聚物用作有机电化学晶体管的活性层时，可观察到稳定的操作。
