Wei Jianing, Yan Jia, Li Shichao, Li Juanzi, Wu Zhanjun
School of Mechanics and Aerospace Engineering, Dalian University of Technology, Dalian 116024, China.
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China.
Polymers (Basel). 2024 Sep 29;16(19):2759. doi: 10.3390/polym16192759.
A liquid oxygen-compatible epoxy resin of fluorinated glycidyl amine (TFEPA) with a low viscosity of 260 mPa·s in a wide range of temperatures, from room temperature to 150 °C, was synthesized and used to decrease the viscosity of phosphorus-containing bisphenol F epoxy resins. And the forming process and application performances of this resin system and its composite were investigated. The viscosity of the bisphenol F resin was decreased from 4925 to 749 mPa·s at 45 °C by mixing with 10 wt.% TFEPA, which was enough for the filament winding process. Moreover, the processing temperature and time windows were increased by 73% and 186%, respectively. After crosslinking, the liquid oxygen compatibility was preserved, and its tensile strength, elastic modulus, and breaking elongation at -196 °C were 133.31 MPa, 6.59 GPa, and 2.36%, respectively, which were similar to those without TFEPA. And the flexural strength and modulus were 276.14 MPa and 7.29 GPa, respectively, increasing by 21.73% in strain energy at flexural breaking, indicating an enhanced toughness derived from TFEPA. Based on this resin system, the flexural strength and toughness of its composite at -196 °C were 862.73 MPa and 6.88 MJ/m, respectively, increasing by 4.46% and 10.79%, respectively.
合成了一种室温至150°C宽温度范围内低粘度（260 mPa·s）的与液氧相容的氟化缩水甘油胺环氧树脂（TFEPA），并用于降低含磷双酚F环氧树脂的粘度。研究了该树脂体系及其复合材料的成型工艺和应用性能。在45°C下，通过与10 wt.%的TFEPA混合，双酚F树脂的粘度从4925降至749 mPa·s，这对于纤维缠绕工艺来说已足够。此外，加工温度和时间窗口分别增加了73%和186%。交联后，液氧相容性得以保留，其在-196°C下的拉伸强度、弹性模量和断裂伸长率分别为133.31 MPa、6.59 GPa和2.36%，与未添加TFEPA的情况相似。弯曲强度和模量分别为276.14 MPa和7.29 GPa，弯曲断裂时的应变能增加了21.73%，表明TFEPA提高了韧性。基于该树脂体系，其复合材料在-196°C下的弯曲强度和韧性分别为862.73 MPa和6.88 MJ/m，分别提高了4.46%和10.79%。
