It is always of great practical significance to develop carbon fiber (CF) reinforced polymer composites with high residual mechanical properties at elevated temperatures for aerospace engineering structures, etc. In this work, the CF reinforced composite based on acetylene-functionalized benzoxazine (AFBEN) was manufactured by the resin transfer moulding (RTM) technology. The mechanical properties at elevated temperatures (150–350 °C) are first and systematically examined for the as-prepared CF/AFBEN composite. Differential scanning calorimetry and rheological characteristics are employed to evaluate the adaptability of AFBEN for the RTM process. Dynamic mechanical and thermogravimetric properties of the CF/AFBEN composite are also investigated to evaluate the thermal stability. The results display that the mechanical strengths of the CF/AFBEN composite exhibit the high residual rates of ca. 90% at 250 °C and over 60% at 350 °C compared to the mechanical properties at room temperature. The fracture mechanisms at room and elevated temperatures are studied and the fracture behavior of the CF/AFBEN composite is shown to transform from fiber-matrix interfacial debonding to resin matrix failure as the temperature increases. Consequently, the as-prepared CF/AFBEN composite show great potentials for practical applications in aerospace engineering structures, etc. due to its high residual mechanical properties at elevated temperatures and the ease of the RTM processing.

开发具有较高残留机械性能的碳纤维增强聚合物复合材料在航空航天工程结构等方面具有很高的实际意义。在这项工作中，基于乙炔官能化苯并恶嗪（AFBEN）的碳纤维增强复合材料得到了广泛应用。由树脂传递模塑（RTM）技术制造。首先，系统地检查了所制备的CF / AFBEN复合材料在高温（150–350°C）下的机械性能。差示扫描量热法和流变特性用于评估AFBEN对RTM工艺的适应性。还研究了CF / AFBEN复合材料的动态力学和热重特性，以评估其热稳定性。结果表明，CF / AFBEN复合材料的机械强度显示出高的残余率。与室温下的机械性能相比，在250°C下为90％，在350°C下超过60％。研究了室温和高温下的断裂机理，结果表明，随着温度的升高，CF / AFBEN复合材料的断裂行为从纤维-基体界面脱粘转变为树脂基体破坏。因此，所制得的CF / AFBEN复合材料由于其在高温下的高残留机械性能和RTM加工的简便性，在航空工程结构等方面具有实际应用的巨大潜力。研究了室温和高温下的断裂机理，结果表明，随着温度的升高，CF / AFBEN复合材料的断裂行为从纤维-基体界面脱粘转变为树脂基体破坏。因此，所制得的CF / AFBEN复合材料由于其在高温下的高残留机械性能和RTM加工的简便性，在航空工程结构等方面具有实际应用的巨大潜力。研究了室温和高温下的断裂机理，结果表明，随着温度的升高，CF / AFBEN复合材料的断裂行为从纤维-基体界面脱粘转变为树脂基体破坏。因此，所制得的CF / AFBEN复合材料由于其在高温下的高残留机械性能以及易于RTM处理，因此在航空航天工程结构等方面具有实际应用潜力。