Supramolecular polymer networks(SPNs)have garnered significant research interest due to their dynamic properties.However,while current developments primarily focus on managing supramolecular crosslinks,the role of pol...Supramolecular polymer networks(SPNs)have garnered significant research interest due to their dynamic properties.However,while current developments primarily focus on managing supramolecular crosslinks,the role of polymer backbones—equally crucial to SPN properties—has not yet been sufficiently explored.Herein,we utilize mechanically interlocked[an]daisy chain as backbone to prepare a class of SPNs,where the force-induced motion of successive mechanical bonds toughens and reinforces the networks.In specific,the[an]daisy chain backbones connect with polynorbornene chains through quadruple H-bonding in the SPN networks.Compared to the control with non-slidable backbone,The representative SPN-2 exhibits a robust feature in tensile tests with high maximum stress(14.7 vs.7.89 MPa)and toughness(83.8 vs.48.6 MJ/m^(3)).Moreover,it also has superior performance in energy dissipation benefitting from the[an]daisy chain backbones as well as supramolecular crosslinks.Additionally,the SPN-2 displayed exceptional self-healing and reprocessing capabilities due to their dynamic quadrable H-bonding crosslinkers.These findings demonstrate the untapped potential of[an]daisy chain as a polymer skeleton to develop SPNs and open the door to design mechanically robust supramolecular materials with diverse smart functions.展开更多
基金the financial support of the National Natural Science Foundation of China(22122105,22071152,22471164 and 52421006)the financial support of the National Natural Science Foundation of China(52403162)+5 种基金the financial support of the National Natural Science Foundation of China(52333001)the financial support of the National Natural Science Foundation of China(22101175,22475128)the Natural Science Foundation of Shanghai(22dz1207603)the Shuguang Program of Shanghai Education Development Foundation and Shanghai Municipal Education Commission(22SG11)the Starry Night Science Fund of Zhejiang University Shanghai Institute for Advanced Study(SN-ZJU-SIAS-006)the State Key Laboratory for Mechanical Behavior of Materials(20222409)。
文摘Supramolecular polymer networks(SPNs)have garnered significant research interest due to their dynamic properties.However,while current developments primarily focus on managing supramolecular crosslinks,the role of polymer backbones—equally crucial to SPN properties—has not yet been sufficiently explored.Herein,we utilize mechanically interlocked[an]daisy chain as backbone to prepare a class of SPNs,where the force-induced motion of successive mechanical bonds toughens and reinforces the networks.In specific,the[an]daisy chain backbones connect with polynorbornene chains through quadruple H-bonding in the SPN networks.Compared to the control with non-slidable backbone,The representative SPN-2 exhibits a robust feature in tensile tests with high maximum stress(14.7 vs.7.89 MPa)and toughness(83.8 vs.48.6 MJ/m^(3)).Moreover,it also has superior performance in energy dissipation benefitting from the[an]daisy chain backbones as well as supramolecular crosslinks.Additionally,the SPN-2 displayed exceptional self-healing and reprocessing capabilities due to their dynamic quadrable H-bonding crosslinkers.These findings demonstrate the untapped potential of[an]daisy chain as a polymer skeleton to develop SPNs and open the door to design mechanically robust supramolecular materials with diverse smart functions.
