Xu Xiangyu, Zhang Baoyan, Shi Fenghui, Liu Kai, Peng Gongqiu, Gao Liang, Gao Junpeng, Du Yu
AVIC Manufacturing Technology Institute Composite Technology Center, Beijing 101300, China.
School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China.
Polymers (Basel). 2025 Mar 10;17(6):724. doi: 10.3390/polym17060724.
Owing to its superior mechanical properties and recyclability, the carbon fabric/polyetheretherketone (CFF/PEEK) composite has seen increasing application in engineering domains. However, studies examining the impact of hygrothermal aging on its performance remain relatively limited in the existing literature. To investigate its durability in hygrothermal environments, this study fabricated CFF/PEEK composites with a fiber volume fraction of 55 vol% and subjected them to equilibrium hygroscopic treatment at 70 °C. The hygroscopic behavior of polyetheretherketone (PEEK) resin and CFF/PEEK composites, along with their tensile and compressive properties under dry conditions at room temperature (RTD) and wet conditions at 70 °C (ETW), were systematically evaluated. The results indicated that both PEEK resin and CFF/PEEK composites exhibited Fickian diffusion behavior during the initial stages of aging but diverged in later stages. The equilibrium moisture absorption rates were approximately 0.32% for PEEK resin and 0.19% for CFF/PEEK composites. After aging at 70 °C, the strength of both materials decreased significantly, while the modulus showed only minor changes. Under ETW conditions, the tensile strength retention rate of PEEK resin was 74.92%, and the compressive strength retention rate was 81.85%. For the CFF/PEEK composites, the tensile strength retention rate was approximately 85%, and the compressive strength retention rate was about 95%. The typical failure modes of CFF/PEEK composites did not exhibit notable differences between tensile and compressive specimens after hygrothermal aging. Resin debonding was observed in the moisture-absorbed composite specimens, while no microcracks or delamination were detected. The degradation of mechanical properties is predominantly attributed to the deterioration of the resin matrix and interface characteristics, which are caused by water molecule intrusion and the adverse effects of wet strain mismatch between the resin and fibers.
由于其优异的机械性能和可回收性，碳纤维织物/聚醚醚酮（CFF/PEEK）复合材料在工程领域的应用日益广泛。然而，现有文献中研究湿热老化对其性能影响的相关研究相对较少。为了研究其在湿热环境中的耐久性，本研究制备了纤维体积分数为55 vol%的CFF/PEEK复合材料，并在70°C下对其进行平衡吸湿处理。系统评估了聚醚醚酮（PEEK）树脂和CFF/PEEK复合材料的吸湿行为，以及它们在室温干燥条件（RTD）和70°C潮湿条件（ETW）下的拉伸和压缩性能。结果表明，PEEK树脂和CFF/PEEK复合材料在老化初期均表现出菲克扩散行为，但在后期有所不同。PEEK树脂的平衡吸湿率约为0.32%，CFF/PEEK复合材料的平衡吸湿率约为0.19%。在70°C老化后，两种材料的强度均显著下降，而模量仅略有变化。在ETW条件下，PEEK树脂的拉伸强度保留率为74.92%，压缩强度保留率为81.85%。对于CFF/PEEK复合材料，拉伸强度保留率约为85%，压缩强度保留率约为95%。湿热老化后，CFF/PEEK复合材料的典型失效模式在拉伸和压缩试样之间没有显著差异。在吸湿的复合材料试样中观察到树脂脱粘现象，但未检测到微裂纹或分层。力学性能的下降主要归因于树脂基体和界面特性的劣化，这是由水分子侵入以及树脂与纤维之间湿应变不匹配的不利影响引起的。
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