Reversible covalent chemistry for property modification of conjugated materials

用于共轭材料性能改性的可逆共价化学

• 批准号: RGPIN-2020-05149
• 负责人: Skene, William
• 金额: $ 4.66万
• 依托单位: Université de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=717393
• 关键词: Reversible; covalent; chemistry; property; modification

The intrinsic properties of conjugated materials are well-suited for their use in a range of plastic electronic devices. Such materials are prepared by coupling aromatic building blocks with robust covalent bonds. Tuning the properties of conjugated materials to match the requirements of a given application requires the judicious selection of monomer building blocks. Once coupled, the properties are locked and they cannot be adjusted. Material degradation during standard device operation results in performance deterioration. The device must then be discarded, resulting in environmental waste. The overarching program goal is to increase the reusability of devices by rejuvenated the intrinsic properties of conjugated materials. This will have ecological rewards, by improving the recycling of devices and reducing electronic waste that is disposed in land fills. Towards this end, it is proposed to leverage the reversibility of dynamic covalent bonds for property tuning. By incorporating the reversible bond into aromatic precursors, conjugated materials with reversible properties will be possible. Reversible property tuning will be done by exchanging the components of conjugated materials. Attaching the conjugated materials to an electroactive surface via covalent bonds will lead to electrodes whose color, fluorescence, and redox chemistry can be modified by reversibly exchanging the components. Different reversible covalent bonds will be explored to develop robust electroactive layers whose properties can be indefinitely adjusted and rejuvenated by component exchange. A combined electrochemical-spectrometer setup will be used to simultaneously measure the change in electrochemistry, color, and fluorescence with component exchange. Property regeneration and materials recycling will be applied to electrochromic devices for improving both their lifetime and end-of-life recyclability. Ultimately, devices can be reused in a different application by rewriting their properties via component exchange, making plastic electronics truly recyclable. Reversible covalent bonds will also be implemented into conductive-stretchable surfaces to make them self-healing. Towards this goal, new monomers will be prepared for developing reparable conductive elastomers. Fatigue induced breaks in the rubber-like electrodes that form when they are repeatedly stretched and bent can be repaired. The developed monomers will also be applied to other substrates, especially those from sustainable and degradable feedstocks. This will lead to the “greening” of plastic electronics by extending their lifetime. Developing electrodes from renewable resources coupled with the self-healing and recyclable properties will reduce the environmental footprint of plastic electronics. Collectively, these properties will move plastic electronics closer towards being truly sustainable, recyclable, and degradable.

共轭材料的固有特性非常适合它们在一系列塑料电子器件中的应用。这种材料是通过将芳香构建块与坚固的共价键偶联而制备的。调整共轭材料的性能以满足给定应用的要求，需要明智地选择单体构建块。一旦耦合，属性就被锁定并且不能调整。在标准设备操作过程中，材料降解会导致性能下降。然后必须丢弃该设备，造成环境浪费。总体计划的目标是通过恢复共轭材料的固有特性来增加设备的可重用性。这将有生态效益，通过改善设备的回收和减少在垃圾填埋场处理的电子垃圾。为此，建议利用动态共价键的可逆性进行属性调整。