Dynamically crosslinked materials generally lose their self-healing ability and mechanical robustness in aqueous,acidic,and basic environments due to disruption of their dynamic interactions and bonds.Herein,a micelle...Dynamically crosslinked materials generally lose their self-healing ability and mechanical robustness in aqueous,acidic,and basic environments due to disruption of their dynamic interactions and bonds.Herein,a micelle-like structure with a hydrophobic outer layer is used to protect ionic interactions.This structure ensures the self-healing and long-term stability of the ionically crosslinked elastomers in aqueous,acidic,and basic environments.The elastomer possesses a tensile strength of 6.7 MPa and a strain at break of 1400%,which is superior to the existing waterproof selfhealing elastomers.The strain sensors and dielectric actuators based on the elastomer are highly stable and self-healable,even in extremely harsh environments.This design strategy of hydrophobic protection for dynamic interactions is quite general,allowing it to be extended to other self-healing materials.展开更多
Elastomers easily undergo a catastrophic failure as soon as a crack is introduced by mechanical damage.Thus,it is extremely important for elastomers to possess fast healing ability,which enables the quick reparation o...Elastomers easily undergo a catastrophic failure as soon as a crack is introduced by mechanical damage.Thus,it is extremely important for elastomers to possess fast healing ability,which enables the quick reparation of cracks.However,developing elastomers with fast self-healing ability and high mechanical strength is highly challenging.Herein,we fabricate a metallosupramolecular elastomer by facilely introducing pyridine-Cu coordination into a copolymer of ethyl acrylate and vinyl pyridine.Interestingly,the pyridine-Cu coordination has a strong photothermal effect,which readily increases the sample temperature to 60℃ in 30 s under near-infrared light.At this temperature,the sticky reptation modes are activated and thus serve as the driving force for network reorganization and fast self-healing of the metallosupramolecular elastomer.Albeit with a tensile strength of 10 MPa,the scratched and completely fractured samples can be healed within 2 min and 3 h,respectively.Moreover,during the damage and healing processes,the break and reformation of the coordination bonds can be tracked through laser confocal micro-Raman spectroscopy.This provides a microscopic methodology to monitor the bond-level healing kinetics of metallosupramolecular polymers.展开更多
基金supported by the National Natural Science Foundation of China(51873110 and 51673120)State Key Laboratory of Polymer Materials Engineering(sklpme2019-2-14)the Fundamental Research Funds for Central Universities。
文摘Dynamically crosslinked materials generally lose their self-healing ability and mechanical robustness in aqueous,acidic,and basic environments due to disruption of their dynamic interactions and bonds.Herein,a micelle-like structure with a hydrophobic outer layer is used to protect ionic interactions.This structure ensures the self-healing and long-term stability of the ionically crosslinked elastomers in aqueous,acidic,and basic environments.The elastomer possesses a tensile strength of 6.7 MPa and a strain at break of 1400%,which is superior to the existing waterproof selfhealing elastomers.The strain sensors and dielectric actuators based on the elastomer are highly stable and self-healable,even in extremely harsh environments.This design strategy of hydrophobic protection for dynamic interactions is quite general,allowing it to be extended to other self-healing materials.
基金supported by the National Natural Science Foundation of China(51873110)Sichuan Science and Technology Program(2021JDJQ0018)the State Key Laboratory of Polymer Materials Engineering。
文摘Elastomers easily undergo a catastrophic failure as soon as a crack is introduced by mechanical damage.Thus,it is extremely important for elastomers to possess fast healing ability,which enables the quick reparation of cracks.However,developing elastomers with fast self-healing ability and high mechanical strength is highly challenging.Herein,we fabricate a metallosupramolecular elastomer by facilely introducing pyridine-Cu coordination into a copolymer of ethyl acrylate and vinyl pyridine.Interestingly,the pyridine-Cu coordination has a strong photothermal effect,which readily increases the sample temperature to 60℃ in 30 s under near-infrared light.At this temperature,the sticky reptation modes are activated and thus serve as the driving force for network reorganization and fast self-healing of the metallosupramolecular elastomer.Albeit with a tensile strength of 10 MPa,the scratched and completely fractured samples can be healed within 2 min and 3 h,respectively.Moreover,during the damage and healing processes,the break and reformation of the coordination bonds can be tracked through laser confocal micro-Raman spectroscopy.This provides a microscopic methodology to monitor the bond-level healing kinetics of metallosupramolecular polymers.
