ИСТИНА

Currently a wide range of organic hole-transport materials based on triphenylamine (TPA) derivatives, which are important components of organic electronics and photonics devices, have been developed [1]. Among them special attention is paid to polymers [2], since compared with low molecular weight compounds TPA-based polymers have better thermal stability, good film-forming properties, and improved adhesion to the substrate. The optoelectronic properties of conjugated polymers can be effectively controlled by intramolecular charge transfer via donor–acceptor (D-A) interactions [3, 4]. The introduction of electron-withdrawing groups makes it possible to change the light absorption region, vary the energy of the HOMO and LUMO levels, and reduce the band gap of hole-transport materials. The currently known examples of D-A copolymers based on triphenylamine, as a rule, are obtained by cross-coupling reactions using expensive catalysts [4]. The preparation of TPA-based copolymers by the simplest synthesis method, oxidative polymerization [5], is quite rare in the literature and is a poorly studied process. In this work, D-A copolymers based on TFA were obtained by oxidative polymerization with FeCl3. The molecular weight characteristics of polymers have been studied. The results of a study of their optical, electrochemical, and thermal properties are presented, as well as a comparative analysis of the properties of copolymers with their closest analogues, homopolymers, is carried out.