A novel copolymer based on tris4-(2-thienyl)phenylamine (TTPA) and 2,2bithiophene (BT) waselectrochemically synthesized.Characterizations of the resulting copolymer P(TTPA-co-BT) wereperformed by cyclic voltammetry (CV), UVis spectroscopy, Fourier transform infraredspectroscopy(FT-IR), scanning electron microscopy (SEM). The P(TTPA-co-BT) film had distinctelectrochromic properties from both the PTTPA and the PBT homopolymers, and exhibited threedifferent colors (claybank, grass green, and blue) under various potentials. Moreover, the copolymerfilm showed high optical contrasts (48.46 at 435 nm and 33.46 at 820 nm) and satisfactoryresponse times (1.92 s at 435 nm and 1.83 s at 820 nm). An electrochromic device (ECD) based onP(TTPA-co-BT) and poly(3,4-ethylenedioxythiophene) (PEDOT) was constructed and characterized.The ECD was found to have a high optical contrast, fast response time, satisfactory optical memoriesand good redox stability.
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