The hygrothermal aging of vinylester resin and its carbon fiber fabric-reinforced composite structures is examined here, focusing on moisture absorption and the consequent degradation of mechanical properties. Specifically, resin casting and CFRP (carbon fiber reinforced polymer) specimens were prepared and immersed into the deionized water and artificial seawater, respectively, at a temperature of 70 °C. Regular weight measurements were taken, accompanied by surface morphology observations using scanning electron microscopy (SEM) and identification of variations in functional groups through Fourier-transform infrared (FTIR) spectroscopy. Meanwhile, the mechanical properties of resin and CFRP were periodically checked. The gravimetric analysis results indicate that resin immersed in deionized water exhibits non-Fickian diffusion due to strong hydrolysis, while CFRP obeys approximately Fickian diffusion because of the embedded carbon fiber inhibiting the hydrolysis. The examination of mechanical properties for CFRP reveals that moisture absorption significantly influences interlaminar shear strength, resulting in a maximum reduction of 13.5%.

本文研究了乙烯基酯树脂及其碳纤维织物增强复合材料结构的湿热老化，重点关注吸湿性和随之而来的机械性能下降。具体来说，制备树脂铸件和CFRP（碳纤维增强聚合物）样本，并将其分别浸入温度为70℃的去离子水和人造海水中。定期进行重量测量，并使用扫描电子显微镜（SEM）进行表面形态观察，并通过傅里叶变换红外（FTIR）光谱鉴定官能团的变化。同时，定期检查树脂和CFRP的机械性能。重量分析结果表明，浸入去离子水中的树脂由于强烈水解而呈现非菲克扩散，而CFRP由于嵌入的碳纤维抑制水解而呈现近似菲克扩散。对CFRP力学性能的检验表明，吸湿对层间剪切强度影响显着，最大降低13.5%。