Reversible covalent chemistry for property modification of conjugated materials

共轭材料的固有特性非常适合在一系列塑料电子设备中使用。这种材料是通过将芳香结构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特定应用的要求，需要明智地选择单体构建块。一旦耦合，这些属性就会被锁定，并且无法调整。标准设备运行过程中的材料退化会导致性能恶化。然后，该设备必须被丢弃，导致环境浪费。该计划的总体目标是通过恢复共轭材料的内在属性来提高设备的可重用性。这将通过改善设备的回收利用和减少丢弃在填埋场中的电子垃圾来产生生态回报。为此，建议利用动态共价键的可逆性来进行属性调整。通过将可逆键结合到芳香族前体中，具有可逆性的共轭材料将成为可能。可逆的性质调整将通过交换共轭材料的组分来完成。通过共价键将共轭材料连接到电活性表面将导致电极的颜色、荧光和氧化还原化学可以通过可逆地交换成分来改变。将探索不同的可逆共价键来开发坚固的电活性层，其性质可以通过成分交换无限地调整和恢复活力。将使用电化学-光谱仪相结合的装置，通过成分交换同时测量电化学、颜色和荧光的变化。性能再生和材料回收将应用于电致变色器件，以提高其寿命和寿命结束时的可回收性。最终，通过部件交换重写设备的属性，可以在不同的应用中重复使用设备，使塑料电子产品真正可回收利用。可逆的共价键也将被应用到可导电可拉伸的表面，使其自我修复。为了实现这一目标，将为开发可修复的导电弹性体准备新的单体。反复拉伸和弯曲时形成的橡胶状电极的疲劳断裂可以修复。开发的单体还将应用于其他底物，特别是那些来自可持续和可降解原料的底物。这将通过延长塑料电子产品的使用寿命来实现绿色环保。利用可再生资源开发电极，再加上可自我修复和可回收的特性，将减少塑料电子产品的环境足迹。总体而言，这些特性将使塑料电子产品更接近真正的可持续、可回收和可降解。

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.