State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University , Sichuan University , Chengdu 610065 , Sichuan , China.
Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology , Chinese Academy of Sciences , Chengdu 610041 , Sichuan , China.
ACS Appl Mater Interfaces. 2019 Mar 27;11(12):12105-12113. doi: 10.1021/acsami.9b00626. Epub 2019 Mar 19.
Inspired by animal muscles, we developed a kind of tough elastomers combining high strength and high stretchability with autonomous self-healing capability. A key structural feature is the construction of a double network (DN) connected by the hydrogen bond and host-guest interactions. The first network is the classic elastomer polyacrylate matrix cross-linked by strong hydrogen bonding. The second network is formed through the host-guest interactions between polycyclodextrin and the adamantane (Ad) groups on the side of the polyacrylate chain. Supramolecular interactions between two networks make them miscible and interpenetrate in the molecular level and then can share the load as the sample was stretched. The host-guest interactions act not only as sacrificial bonds for energy dissipation but also as self-healing driving forces. The tensile strength of the DN elastomer reaches about 6.7 MPa and the strain is as high as about 950%. The DN elastomer can be easy to repair by touching the damaged surface together at ambient conditions when broken or cut. The recovered tensile strength can reach over 4.5 MPa, which is better than the most pristine strength of existing spontaneous self-healing elastomers.
受动物肌肉启发，我们开发了一种坚韧的弹性体，它具有高强度、高拉伸性和自主自修复能力。其关键结构特征是构建了一个由氢键和主客体相互作用连接的双网络（DN）。第一个网络是由强氢键交联的经典弹性体聚丙烯酸酯基质。第二个网络是通过聚环糊精和聚丙烯酸链侧上的金刚烷（Ad）基团之间的主客体相互作用形成的。两个网络之间的超分子相互作用使它们在分子水平上混溶和互穿，然后可以在样品拉伸时共享负载。主客体相互作用不仅作为能量耗散的牺牲键，而且作为自修复驱动力。DN 弹性体的拉伸强度约为 6.7 MPa，应变高达约 950%。当在环境条件下破损或切割时，DN 弹性体可以通过触摸损坏的表面很容易地进行修复。恢复后的拉伸强度可以达到 4.5 MPa 以上，优于现有自发自修复弹性体的大多数原始强度。
