基于新型N-羟基琥珀酰亚胺类酯交换反应的动态共价聚合物

动态共价聚合物是一类含有可逆化学键的新型聚合物，具有拓扑结构可调、形状记忆、自修复和再加工等诸多功能，是近些年高分子科学领域的研究热点之一。但目前基于新型酯交换反应的动态共价聚合物的开发尚少有报道。基于对分子结构-性能关系的理解，从动态共价聚合物的分子设计出发，申请人拟研究的项目将以N-羟基琥珀酰亚胺型酯交换反应为研究对象，采用实验与理论相结合的方法，系统研究这类酯交换反应的动力学与反应机理，获得具有高效可逆性的分子结构。以此结构为基础，设计合成新型的动态共价聚酯类材料，通过控制分子结构实现聚合物的机械性能，可逆性和形状记忆功能的调控，完成聚酯材料的快速降解和回收复用。最终，结合3D打印技术实现聚合物制件搭积木式的焊接组装和材料形变的程序化控制。本项目研究结果将有望克服传统酯交换反应能耗高和需要催化剂的缺点，为智能高分子材料的设计和制备提供新的思路。

Dynamic covalent polymers, which rely on reversible covalent bonds, can reorganize their macromolecular architectures and thus produce a macroscopic response to environmental stimuli. Therefore, dynamic covalent polymers possess many complex and smart functions such as topological structure transformation, shape memory, self-healing and malleability, to name a few. However, as of now, the development of dynamic covalent polymers based on a novel transesterification reaction is rarely reported. Based on the relationship between molecular structure and its performance, the proposed work aims to develop a new kind of dynamic transesterification reaction using N-hydroxy succinimide chemistry and its application in the design of dynamic covalent polymers. First, we would systematically study the kinetic parameters and reaction mechanism by employing experiential and theoretical methods to obtain the proper moiety with efficient reversible ability. Then, the polyester materials are designed and synthesized on the basis of N-hydroxy succinimide transesterification reaction. By tuning the monomer formulas, dynamic polyesters with excellent mechanical properties, controllable reversibility and shape memory are achieved leading to fast recycling and degradation under mild conditions. Besides, the integration of dynamic covalent polymers with 3D printing technology will allow modular welding and programmed transformation of polymer materials. The expected results will realize the transesterification reaction under mild conditions without any catalysts and these findings will aid in the design and preparation of smart polymers.