Self-repairing materials have attracted extensive attention due to the advantages such as extending the service life of materials,saving cost and energy and promoting sustainable development.Of which,self-repairing materials based on reversible covalent bonds are more suitable for preparing high-strength self-repairing materials since it can repair repeatedly many times and the bond energy of its reversible covalent bond is higher than reversible non-covalent bond.However,good self-repairing effects can hardly coexist with excellent mechanical properties for a same material because the dynamically reversible covalent bond owns lower bond energy than traditional covalent bonds and is therefore easier to be damaged.Furthermore,good self-repairing effects require molecular chain to move fast in order to recombine on damaged surfaces.The difficult issue for current research is to make the dynamically covalently crosslinked bond-based polymer retain good self-repairing effect and enhance mechanical property.In order to improve the mechanical properties of self-repairing materials,molecular-scale polyhedral oligomeric silsesquioxanes (POSS) are drawn into the crosslinking network through the thiol-ene reaction.Tests show that the mechanical properties of the composite will be the best and its elongation at break can also be increased when the mass content of OVPOSS reaches 10％.Meanwhile the composite material can achieve a repair efficiency of more than 95％,achieving the purpose of improving the mechanical performance without affecting the repair efficiency.
NETL
NSTL
万方数据
维普
