Internal catalysis significantly promotes the bond exchange of covalent adaptable polyurethane networks

• 成果类型: Article
• 署名作者: Huang, Hongfei; Sun, Wei; Sun, Lijie; Zhang, Luzhi; Wang, Yang; Zhang, Youwei; Gu, Shijia; You, Zhengwei; Zhu, Meifang; Aizenberg, Joanna
• 署名单位: Donghua University
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-13021
• DOI: 10.1073/pnas.2404726121
• 发表日期: 2024-08-20
• 关键词: ring-opening polymerization; chemistry

摘要

Self- healing covalent adaptable networks (CANs) are not only of fundamental interest but also of practical importance for achieving carbon neutrality and sustainable development. However, there is a trade- off between the mobility and cross- linking structure of CANs, making it challenging to develop CANs with excellent mechanical properties and high self- healing efficiency. Here, we report the utilization of a highly dynamic four- arm cross- linking unit with an internally catalyzed oxime- urethane group to obtain CAN- based ionogel with both high self- healing efficiency (>92.1%) at room temperature and superior mechanical properties (tensile strength 4.55 MPa and toughness 13.49 MJ m-3). This work demonstrates the significant potential of utilizing the synergistic electronic, spatial, and topological effects as a design strategy for developing high- performance materials.