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<p>We present the synthesis and characterization of a pendant polyviologen copolymer with liquid crystalline side chains, poly(APPV-RM105), exhibiting transmissive-to-black electrochromic switching. This copolymer integrates an asymmetric viologen derivative tailored for robust black electrochromic switching. Though the role of liquid crystalline side chains on electrochromic properties has not been explicitly evidenced, the electrochromic devices (ECDs) incorporating poly(APPV-RM105) reveal excellent performances, including fast switching (&lt; 10&#xa0;s), high ionic conductivity (5.82 mS/cm), outstanding optical contrast (91% change in transmittance), and extended cycling stability for more than 300 cycles. In addition, the black ECDs exhibit strong photothermal conversion and heat-shielding capabilities. The current polymer-based single-component device structure simplifies fabrication, underscoring the considerable potential for practical applications, such as smart windows, adaptive displays, and thermal management systems.</p>

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Transmissive-to-Black Electrochromic Switching of Pendant Polyviologen with Liquid Crystalline Side Chains

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Do Yeon Kim,
  • Wei Zhang,
  • Soo Yeon Eom,
  • Jong S. Park

摘要

We present the synthesis and characterization of a pendant polyviologen copolymer with liquid crystalline side chains, poly(APPV-RM105), exhibiting transmissive-to-black electrochromic switching. This copolymer integrates an asymmetric viologen derivative tailored for robust black electrochromic switching. Though the role of liquid crystalline side chains on electrochromic properties has not been explicitly evidenced, the electrochromic devices (ECDs) incorporating poly(APPV-RM105) reveal excellent performances, including fast switching (< 10 s), high ionic conductivity (5.82 mS/cm), outstanding optical contrast (91% change in transmittance), and extended cycling stability for more than 300 cycles. In addition, the black ECDs exhibit strong photothermal conversion and heat-shielding capabilities. The current polymer-based single-component device structure simplifies fabrication, underscoring the considerable potential for practical applications, such as smart windows, adaptive displays, and thermal management systems.