共价可适聚合物网络中动态共价键的可逆性研究进展

Research progress on reversibility of dynamic covalent bonds in covalently adaptable polymer networks

将动态共价键(DCB)引入聚合物网络可形成共价可适聚合物网络(CAN)。动态共价键能赋予CAN自愈合、再赋形和再加工等特点,从而提高资源的利用率或可持续性。动态共价键的可逆性是实现上述功能的前提,故探讨其解离/重组或缔合交换机理具有重要意义。从模型分子交换反应、聚合物流变学、聚合物网络原位表征等角度综述了非缔合型及缔合型动态共价键可逆性的研究进展,并对该研究领域的发展方向作出展望。

The covalently adaptable polymer network(CAN)can be formed by introduction of dynamic covalent bonds(DCB)into a polymer network.The DCB can endow CAN the characteristics such as self-healing,reshaping,and reprocessing,thereby improving resource utilization or sustainability.The reversibility of DCB is the premise of realizing the above functions,so it is of great significance to explore the mechanism of dissociation/recombination or association exchange.The research progresses of the reversibility of dissociative and associative DCB were reviewed from the exchange reaction of model molecules,polymer rheology,and in situ characterization of polymer networks.The development direction of this research field was prospected.