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A recyclable polyurethane with characteristic thermal stiffening behavior via b-N coordination with reversible b-o bonds

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Science China Materials 2024年第10期67卷 3339-3346页

作者： Hui Xiong Linjun Zhang Qi Wu Jinrong Wu College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China Key Laboratory of Composite Materials on Electrical Insulation National Energy AdministrationJiangsu Shemar Electric Co.Ltd.Nantong 226017China

Thermal softening is an inevitable process in the physical ***(PU),a typical commercial material,is constructed by physical networks,which undergoes the serious thermal decay on mechanical properties at high ***,a physically cross-linked PU with a unique thermal stiffening behavior has been developed by incorporating b–N coordination with reversible b–o *** b–N coordination can significantly improve the mechanical properties of the *** reversible b–o bonds(temperature dependent reversible transformation between b–oH and b–o–b)are conducive to constructing more multicoordination macromolecular crosslinking points and more stable b–N coordination bonds at high temperature,endowing the PU with the special thermal stiffening behavior for the first *** thermal stiffening behavior compensates for the bond breakage and the network destruction caused by heat,significantly expands the rubbery plateau and delays the entire chain motion of the thermoplastic *** a result,the terminal flow occurs at a higher temperature up to 200°*** modulus retention ratio of the materials is up to 87%even at 145oC,which is much higher than that of the existing PU elastomer with the physical network and even some covalent cross-link ***,the physical network ensures the recyclability of the PU,and the thermal stiffening behavior is still obtained in recycled *** work provides a simple strategy to impart thermal stiffening behavior to the physically crosslinked PU,thereby significantly extending the operating temperature range of thermoplastic PU,which can potentially expand the scopes of PU in applications under harsh conditions.

关键词： recyclable polyurethane b-N coordination reversible b-o bonds thermal stiffening behavior

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