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研究了45℃几种介质环境中碳纤维/不饱和聚酯树脂(CF/UPR)复合材料的吸湿特性和静态力学性能的变化规律,对湿热老化前后CF/UPR复合材料进行了IR和SEM分析。结果表明,CF/UPR复合材料在5%NaCl和5%H2SO4的吸湿行为符合菲克第二定律,浸泡720h后,复合材料弯曲强度保留率均发生下降,且以碱性条件下的弯曲强度保留率下降最为严重;IR和SEM结果表明,湿热环境导致该复合材料发生基体的水解反应、界面脱粘以及基体塑化、溶胀并由此产生裂纹等缺陷。
The moisture absorption and static mechanical properties of carbon fiber / unsaturated polyester resin (CF / UPR) composites in 45 ℃ medium environment were studied. The IR and SEM of CF / UPR composites before and after wet heat aging were studied. The results show that the hygroscopic behavior of CF / UPR composites accords with Fick’s second law in 5% NaCl and 5% H2SO4, and the retention of flexural strength of the composites decreases after soaking for 720 h, and the flexural strength of CF / IR and SEM results showed that the hot and humid environment led to the matrix material hydrolysis reaction, the interface debonding and matrix plasticizing, swelling and the resulting cracks and other defects.