Zhang Shuai, Zhang Yubai, Wu Yahe, Yang Yang, Chen Qiaomei, Liang Huan, Wei Yen, Ji Yan
The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education) , Department of Chemistry , Tsinghua University , Beijing 100084 , China . Email:
Department of Chemistry , Center for Nanotechnology , Institute of Biomedical Technology , Chung-Yuan Christian University , Chung-Li 32023 , Taiwan , China.
Chem Sci. 2020 Jun 2;11(29):7694-7700. doi: 10.1039/d0sc01678k. eCollection 2020 Aug 7.
Covalent adaptable networks (CANs) represent a novel covalently cross-linked polymer that is capable of being reprocessed and recycled relying on reversible covalent bond structures and present exceptional opportunities in a wide range of prospective applications. However, it is genuinely difficult to fabricate bulk CAN blocks with solid-core geometries that possess complex shapes or multiple materials, which are crucial in cutting-edge fields such as soft robotics, flexible electronic devices and biomedical engineering. Here we report a welding technique to strategically construct complex and heterogeneous 3D CAN structures by utilizing a solder doped with magnetic nanoparticles. The solder is able to induce a bond exchange reaction at the interface between the to-be-welded pieces. Using this method, not only CAN bulks with the same materials can be welded to form complex geometries, distinctive bulks with different physical properties and chemical compositions can also be connected to fabricate multimaterial devices. Besides, this method can be used to repair damaged CAN materials and efficiently recycle scrap CAN materials, which can effectively save resources and protect the environment. The universality and robustness of this strategy is expected to promote CAN application in broader functional polymer fields.
共价自适应网络（CANs）是一种新型的共价交联聚合物，依靠可逆共价键结构能够进行再加工和回收利用，并在广泛的潜在应用中展现出非凡的机遇。然而，制造具有复杂形状或多种材料的实心几何形状的块状CANs确实困难，而这些在软机器人技术、柔性电子设备和生物医学工程等前沿领域至关重要。在此，我们报告一种焊接技术，通过利用掺杂有磁性纳米颗粒的焊料，策略性地构建复杂且异质的三维CAN结构。该焊料能够在待焊接部件之间的界面处引发键交换反应。使用这种方法，不仅相同材料的CAN块体可以焊接形成复杂的几何形状，具有不同物理性质和化学成分的独特块体也能够连接起来制造多材料器件。此外，该方法可用于修复受损的CAN材料，并有效回收废旧CAN材料，这能够有效节约资源并保护环境。预计该策略的通用性和稳健性将推动CAN在更广泛的功能聚合物领域的应用。
