氢键交联本征可拉伸PEDOTs的设计合成及其电致变色器件

可拉伸电致变色器件在柔性显示及可穿戴电子设备领域具有广阔的应用价值及市场开发前景，正在引起国际范围内的广泛关注。高性能本征可拉伸导电聚合物电致变色材料有望实现该领域的新突破，然而目前许多科学问题如聚合物合成方法学、结构-性能关联、应变-性能关联及器件制作工艺等尚未有效解决。基于良好的前期工作基础，本项目拟采用动态非共价交联法，以2,6-吡啶二甲酰胺类单元（PDCA）作为链间氢键交联结构，嵌入电致变色性能优异的聚（3,4-二氧乙撑噻吩）类导电聚合物（PEDOTs）主链，设计合成出系列氢键交联本征可拉伸PEDOTs电致变色新材料；系统研究聚合物的结构及电致变色、力学等各项性能，揭示本征可拉伸PEDOTs的结构-性能、应变-性能关联规律；筛选性能优良的材料，构建可拉伸电致变色器件，开展器件制作工艺优化及各项性能评估，为可拉伸导电聚合物电致变色材料的制备及器件研究提供一定的理论指导与技术支撑。

Stretchable electrochromic devices display promising applications and bright market prospects in flexible displays and wearable electronics, and they have aroused widespread interest most recently by chemists, materials and mechanics scientists. Development of intrinsically stretchable conducting polymers with high electrochromic performances is very significant from both theoretical and practical aspects. However, design and synthesis of intrinsically stretchable conducting polymers suffice for applications remains a great challenge due to the lack of effective synthetic methodology. Also, many relative fundamental scientific questions for these materials, such as structure-property relationship, strain-property relationship, and corresponding device fabrication and optimization, etc., are not well understood. In this project, the concept of incorporating dynamic non-covalent crosslinking between flexible polymer chains will be employed to achieve high stretchability and self-healing properties for electrochromic conducting polymers. 2,6-Pyridine dicarboxamide (PDCA) is chosen to introduce hydrogen bonding within the flexible polymer backbone of poly(3,4-ethylenedioxythiophene)s-based structures (PEDOTs) with outstanding electrochromic performances since this unit contains two amide groups possessing moderate hydrogen-bonding strength, allowing the formation of a polymer network without drastically increasing the tensile modulus of the material. A series of intrinsically stretchable PEDOTs cross-linked by hydrogen-bonding from PDCA will be designed and synthesized via Stille/Suzuki coupling reaction. Then the properties of the resulting polymer materials, such as structural information, spectroscopic properties, electrochromic properties, electrical conductivity, and mechanical properties, etc., will be investigated in detail. Further, those polymers with superior performance will be chosen to fabricate stretchable electrochromic devices, whose performances will be improved by optimizing preparing technology and working conditions. Finally, the structure-property relationship and strain-property relationship of these polymers and devices will be summarized and explored to provide theory instruction and technique basis for future research.