热固性光敏树脂因其优异的高温力学稳定性、耐化学性以及与高精度3D打印系统良好的兼容性，几乎占据了3D打印材料市场的半壁江山。然而其共价交联的特性使得该树脂难以回收和再加工，这种不可再处理性导致大量的材料浪费从而产生严峻的环境污染问题。因此开发可再加工的热固性光敏树脂迫在眉睫。申请人前期初步探索了设计制备可再处理热固性光敏树脂3D打印材料的可行性。鉴于此，本项目拟将动态共价键引入到光敏打印体系中，开发出含动态共价键的光敏树脂，使其适用于光固化3D打印的同时，也具备自修复功能和再加工性。本项目的实施，预期开发出机械性能可调控的含动态共价键光敏树脂材料，并通过引入其他非共价键等方法进一步提高所制备材料的自修复能力和再加工性，实现光敏树脂的可循环3D打印，缓解由于3D打印材料消耗量持续增加带来的环境挑战。

Due to their superior mechanical stability at high temperature, excellent chemical resistances as well as good compatibility with high-resolution three-dimensional (3D) printing technologies, thermosetting photopolymers have claimed almost half of 3D printing materials market. However, the chemically cross-linked nature brings considerable difficulty in reprocessing and recycling such materials. In the previous study, the applicant developed a reprocessable thermosetting photopolymers which are suitable for UV based 3D printing technique, and initially explored the feasibility of reprocessing such resin. In view of this, the project intends to introduce dynamic covalent bonds into the photosensitive printing system, and develops a dynamic covalent bond based photosensitive resin, which is suitable for photocuring based 3D printing, and also is self-healable and reprocessable. The implementation of this project is expected to develop dynamic covalent bond-based photopolymers with controllable mechanical properties, which can further improve the self-healing ability by introducing dynamic physical bonds. Moreover, the recyclable 3D printing of the thermosetting photopolymers could be realized, providing a practical solution to address environmental challenges associated with the rapid increase in consumption of 3D printing materials.