文献类型：期刊文献

英文题名：High-strength, stretchable, and NIR-induced rapid self-healing polyurethane nanocomposites with bio-inspired hybrid cross-linked network

作者：Deng, Tianbo[1];Zhu, Junyuan[1];Zhao, He[1];Xu, Binbin[1];Zhang, Ling[1];Li, Chunzhong[1]

机构：[1]East China Univ Sci & Technol, Key Lab Ultrafine Mat, Shanghai Engn Res Ctr Hierarchical Nanomat, Frontiers Sci Ctr Materiobiol & Dynam Chem,Sch Mat, Shanghai 200237, Peoples R China

年份：2024

卷号：17

期号：7

起止页码：5930

外文期刊名：NANO RESEARCH

收录：;EI(收录号：20241415841543);WOS:【SCI-EXPANDED(收录号:WOS:001194941200002)】；

基金：This work was supported by the National Natural Science Foundation of China (Nos. 22278140, U22B20143, and 52273008), the Science and Technology Commission of Shanghai Municipality (Nos. 22DZ1205900 and 22ZR1479300), Shanghai Rising-Star Program (No. 23QA1402500), Project supported by Shanghai Municipal Science and Technology Major Project, and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：self-healing materials; smart nanocomposite; high mechanical property; shape memory; recyclability

摘要：Stretchable and self-healable materials with excellent mechanical performance hold great promise for applications in flexible functional devices. Despite rapid developments, achieving high mechanical strength, extreme stretchability, and rapid self-healing capability in self-healing materials remains challenging. Here, inspired by the hierarchical structure and unique network of connective tissue, we fabricated a class of bionic nanocomposites with high stretchability, outstanding mechanical strength, and rapid self-healing ability by integrating the bottlebrush copolymer functionalized graphene oxide (BCP@GO) into a polyurethane (PU) matrix via in-situ polymerization. The bottlebrush copolymer (BCP) acted as a bond bridge for linking the GO nanosheets (noncovalent interaction) and PU chains (covalent and hydrogen-bond interaction). The covalent interactions were responsible for providing high mechanical strength, and the abundant hydrogen-bond-based cross-links realized extreme stretchability and rapid self-healing capability. The resultant BCP@GO/PU nanocomposite with only 0.5 wt.% GO loading exhibited excellent mechanical properties (tensile strength increased by 52.1%, up to 28.6 MPa; toughness increased by 70.8%, up to 256.9 MJ/m(3); elongation at break increased by 12.8%, up to 1847.2%), exceptional rapid and efficient self-healing ability (similar to 99% with 20 s NIR irradiation), as well as superior shape memory and recyclable capability. This study develops a new strategy for designing high-performance self-healing nanocomposites and unfolds broad application prospects in smart materials.