Two donor-acceptor electrochromic copolymers containing fused rigid units of cyclopentadithiophene and diketopyrrolopyrrole, namely PCPDTT-DPP with benzene and thiophene ring linkers, were successfully synthesized. The electrochromic properties of the copolymers were characterized by cyclic voltammetry, UV-Vis spectroscopy and spectroelectrochemical method. The results demonstrated that the effect of DPP on the copolymer showed the p-type doping with an electrochemical band gap of 1.45 eV. The copolymer showed a higher color contrast changing from purple to transparent with %ΔT of 55% at ±1.0 V vs. Ag/AgCl compared to the parent polymer containing only cyclopentadithiophene unit. The results indicated that the new copolymer could be a potential candidate for electrochromic materials in smart films and windows.

成功合成了两种含有环戊二噻吩和二酮吡咯并吡咯的稠合刚性单元的供体-受体电致变色共聚物，即具有苯和噻吩环连接基的PCPDTT-DPP。通过循环伏安法，紫外可见光谱和光谱电化学方法表征了共聚物的电致变色性能。结果表明，DPP对共聚物的影响显示出p型掺杂，电化学带隙为1.45eV。与仅包含环戊二噻吩单元的母体聚合物相比，该共聚物显示出更高的颜色对比度，从紫色变为透明，在相对于Ag / AgCl的±1.0 V下，％ΔT为55％。结果表明，该新型共聚物可能是智能薄膜和窗户中电致变色材料的潜在候选者。