Xu Mingzhen, Li Bo, Li Xiongyao, Fan Zexu, Ren Dengxun
Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.
School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China.
Polymers (Basel). 2023 Aug 23;15(17):3516. doi: 10.3390/polym15173516.
Self-polymerization epoxy/phthalonitrile (APPEN) pre-polymers were studied systematically, and then, gelation time and differential scanning calorimetry (DSC) were employed to investigate their curing behaviors. Taking advantage of orthogonal test analysis, the key factors that affected the co-polymerization of APPEN were defined and the appropriate pre-polymerization conditions were analyzed. A possible curing mechanism of APPEN was proposed. Then, the thermomechanical and mechanical properties of glass-fiber-reinforced APPEN laminates (APPEN/GF) prepared at 180 °C were analyzed to understand the cross-linked and aggregation structures. Fracture surface of the composite laminates was also investigated to reveal the copolymerization degree and the interfacial binding. The results indicated that APPEN/GF composites exhibit outstanding mechanical and thermomechanical properties (flexural strength, 712 MPa, flexural modulus, 38 GPa, and > 185 °C). The thermal stability ( > 334 °C and reached 1482 °C) of APPEN/GF composites was also investigated to further reveal the copolymerization between epoxy resin and aminophthalonitrile, which may be beneficial to the application of epoxy-matrix-based composites in the field of high-performance polymer composites.
对自聚合环氧/邻苯二甲腈（APPEN）预聚物进行了系统研究，然后采用凝胶化时间和差示扫描量热法（DSC）研究其固化行为。利用正交试验分析确定了影响APPEN共聚的关键因素，并分析了合适的预聚合条件。提出了一种可能的APPEN固化机理。然后，对在180℃下制备的玻璃纤维增强APPEN层压板（APPEN/GF）的热机械性能和力学性能进行了分析，以了解其交联和聚集结构。还对复合层压板的断裂表面进行了研究，以揭示共聚程度和界面结合情况。结果表明，APPEN/GF复合材料具有优异的力学和热机械性能（弯曲强度为712MPa，弯曲模量为38GPa，且>185℃）。还研究了APPEN/GF复合材料的热稳定性（>334℃且达到1482℃），以进一步揭示环氧树脂与氨基邻苯二甲腈之间的共聚情况，这可能有利于环氧基复合材料在高性能聚合物复合材料领域的应用。
