It is a great challenge to obtain black-to-transmissive switches using one type of polymer. Therefore, the color blending/mixing theory has been previously applied by many research groups to produce black-to-transmissive materials (BTMs) through the (electro)chemical copolymerization of several monomers. However, these (electro)chemical copolymerization methods exhibited numerous drawbacks in terms of sustainability. In this work, for the first time, the synthesis of an electrically conductive (bromide-doped) poly(3,4-ethylenedioxythiophene)-poly(N-ethylcarbazole) (PEDOT-co-PECz) copolymer was demonstrated using an in situ and sustainable photopolymerization technique. Spectrally and microscopically characterized copolymers were then deposited onto ITO/glass using spray coating. The copolymer film demonstrated to switch from a black state (L*: 38.16; a: −0.33; b: −2.89) to a transmissive state (L* = 83, a* = −3, b* = −6) with a contrast of 31.6% ΔT at 650 nm in fast response times (2.28–4.38 s). The results highlight the importance of this advanced method for the sustainable and fast fabrication of smart windows.

中文翻译：

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通过可持续且简便的原位光（共）聚合方法实现黑色到透射电致变色切换 PEDOT-共聚（N-乙基咔唑）


使用一种聚合物获得黑色到透射的开关是一个巨大的挑战。因此，颜色混合/混合理论之前已被许多研究小组应用，通过几种单体的（电）化学共聚来生产黑色到透射材料（BTM）。然而，这些（电）化学共聚方法在可持续性方面表现出许多缺点。在这项工作中，首次使用原位和合成方法演示了导电（溴化物掺杂）聚（3,4-乙撑二氧噻吩）-聚（N-乙基咔唑）（PEDOT-co-PECz）共聚物的合成。可持续光聚合技术。然后使用喷涂将光谱和显微镜表征的共聚物沉积到 ITO/玻璃上。共聚物薄膜被证明可以从黑色状态（L*：38.16；a：-0.33；b：-2.89）转变为透射状态（L* = 83，a* = -3，b* = -6），其中在快速响应时间（2.28-4.38 秒）内，650 nm 处的对比度为 31.6% ΔT。结果凸显了这种先进方法对于可持续、快速制造智能窗户的重要性。