Colorless polyimides with excellent optical transparency and self-healing properties based on multi-exchange dynamic network. (December 2021) - Kim, Young Nam
Highlights: We developed a new type of CPI with superior self-healing function by controlling the multi exchange dynamic network. The self-healing CPI shows that the trade-off between durability and functionality can be completely resolved. This paper ultimately proposes a high potential in various industrial fields including display and flexible electronic devices. Abstract: Colorless polyimides (CPIs) with outstanding mechanical properties are used as essential materials in the production of future flexible display panels, foldable windows, and spacecraft cockpit materials. However, under repetitive stress and deformation, fatigue fractures caused by cracks and radio waves may act as critical determinants of the properties and duration of the material. To solve this problem, the present study developed a CPI capable of self-healing, wherein the transparency and any damage caused by external stress are rapidly and easily restored. Our synthesized CPI films showed ultra-transmittance (> 95%) and excellent self-healing efficiency (> 98%) with a simultaneously induced multi exchange network. Notably, the films exhibited excellent mechanical properties even after a bending fatigue test involving more than 10, 000 cycles. This study therefore suggests a new type of CPI with a self-healing function and shows that the trade-off between the durability and functionality can be completely resolved. Graphical abstract: Image, graphical abstract