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Rongzong Zheng1 Yi Wang1 Zhongquan Wan1 Chunyang Jia1 Jianlian Xie1

1, University of Electronic Science and Technology of China, Chengdu, Sichuan, China

The animals, such as chameleon, have the capability to change the skin colors to protect itself against any external threats, and can self-healed the wound of skin tissues. Inspired by this, here we present a novel copolymer film possessing biomimetic properties, which simultaneously integrates the electrochromic triphenylamine (TPA) and self-healing Diels-Alder groups. The flexible and stretchable film DFTPA-PI-MA based on TPA polyimide Diels-Alder copolymer acts like the natural chameleons skin. Remarkable electrochromic properties and excellent self-healing performance of the polymer were presented: Switching the colors from faint yellowish to olive green, excellent electrochemical cycle stability comprising more than 100 cycles with only minor decay of 1.12%. The coloration efficiency was 82.8 cm2C-1, coloring and bleaching response times were 5.3 and 12.2 s, respectively. The scars were self-healed just about 3 minutes at different color states, and the self-healed copolymer film can maintain the excellent electrochromic performance as before. The self-healing efficiency of the stretchable free-standing copolymer films is about 90%, experimentally proven by re-healing two halves of copolymer film into a single stretchable film. These remarkable features make it very promising material to overcome the crack generation problem inherited by conventional biomimetic chameleon skin. Moreover, the flexible copolymer was coated on silver conductive fabric to get the self-healing electrochromic fabric, and further assembled into the flexible wearable all-solid electrochromic skin successfully. The electrochromic skin like the versatile biomimetic chameleon skin, has good reliability for unprecedented applications such as civil and defense applications like flexible displays, artificial skins and stealth military hardware. The verified electrochromic and self-healing properties proves that the electrochromic skin like the versatile intelligent biomimetic chameleon skin, has good reliability for unprecedented applications such as civil and defense applications like flexible displays, artificial skins and stealth military hardware.

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