There have been increasing research attention directed towards black to transmissive switching electrochromic polymers, few reports employed simple polymers with a low production cost. Herein, we report the preparation of a series of polymers P2-P6 by incorporating different spacing units (i.e. carbazole, naphthalene, and phenylene) into the well-studied polymer P1, a copolymer of 3,4-propylenedioxythiophene (ProDOT) and benzothiadiazole (BTD). Simple preparation of polymers P2-P6 with spacing units were realized via C-H arylation polymerization between corresponding monomers, which are readily available. By inserting such phenyl-ring containing spacing units into oligoProDOT moieties, conjugation between ProDOT units was disrupted. Thus, polymers P2-P6 based electrochromic devices show a new absorption peak in short wavelength region (400 nm–500 nm) resulting a × b* values (<±10), which are closer to a true black hue than that of P1 (−1.2, −15.39) in neutral state. Meanwhile, we demonstrate that the colorimetric properties of P4 (0.32, −6.43) and P6 (−0.06, −4.26) are better performing than most existing black polymers.

越来越多的研究注意力转向黑色到透射转换电致变色聚合物，很少有报道采用生产成本低的简单聚合物。在此，我们报告了通过将不同的间隔单元（即咔唑，萘和亚苯基）掺入经过精心研究的聚合物P1中制备的一系列聚合物P2 - P6，该聚合物P1是3,4-丙二氧基噻吩（ProDOT）和苯并噻二唑（ BTD）。简单制备聚合物P2-P6间隔单元之间的间隔是通过相应单体之间的CH芳基化聚合实现的，这些单体很容易获得。通过将这样的含苯环的间隔单元插入到oligoProDOT部分中，ProDOT单元之间的结合被破坏。因此，基于聚合物P2-P6的电致变色器件在短波长区域（400 nm-500 nm）中显示出新的吸收峰，从而产生a×b *值（<±10），比P1的色度更接近真实的黑色（ -1.2，-15.39）处于中性状态。同时，我们证明了P4（0.32，-6.43）和P6（-0.06，-4.26）的比色性能优于大多数现有的黑色聚合物。