Zhang Minghao, Xia Min, Guo Tao, Zhong Lin, Hou Xudong, Ren Yeping, Lv Haohao, Luo Yunjun
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P. R. China.
Macromol Rapid Commun. 2025 May;46(10):e2401050. doi: 10.1002/marc.202401050. Epub 2025 Feb 27.
To develop a binder system suitable for photocurable additive manufacturing of solid propellants, this study utilizes ethylene oxide-tetrahydrofuran copolyether (PET), a commonly employed binder in solid propellants, as foundational material. By modifying terminal groups, two photocurable binders are synthesized: allyl-terminated polyether (AUPET) and acrylate-terminated polyether (PUA). The exothermic behavior of photopolymerization and the mechanical properties of these binders are comprehensively investigated. PUA exhibits a significantly faster photopolymerization rate than AUPET, enabling rapid photocuring and molding. Both binders demonstrate photocuring capability in the presence of thiols. Mechanical property testing indicates PUA forms brittle films under self-curing conditions, with a tensile strength of 1.18 MPa and an elongation at break of 81.07%, whereas AUPET, upon curing in the presence of thiol, exhibits enhanced flexibility, showing a tensile strength of 0.37 MPa and an elongation at break of 587.49%. Additionally, incorporating a triazine ring structure significantly enhances the tensile strength of PUA and AUPET films, the presence of thiols improves their elongation at break.
为开发一种适用于固体推进剂光固化增材制造的粘结剂体系，本研究采用环氧乙烷-四氢呋喃共聚醚（PET），一种在固体推进剂中常用的粘结剂，作为基础材料。通过对端基进行改性，合成了两种光固化粘结剂：烯丙基封端聚醚（AUPET）和丙烯酸酯封端聚醚（PUA）。对这些粘结剂的光聚合放热行为和力学性能进行了全面研究。PUA的光聚合速率明显快于AUPET，能够实现快速光固化和成型。两种粘结剂在硫醇存在下均表现出光固化能力。力学性能测试表明，PUA在自固化条件下形成脆性薄膜，拉伸强度为1.18MPa，断裂伸长率为81.07%，而AUPET在硫醇存在下固化时，柔韧性增强，拉伸强度为0.37MPa，断裂伸长率为587.49%。此外，引入三嗪环结构显著提高了PUA和AUPET薄膜的拉伸强度，硫醇的存在提高了它们的断裂伸长率。
