摘要
采用氙灯老化箱模拟自然环境,加速老化芳纶复合材料,通过全反射红外光谱(ATR-FTIR)、动态力学分析(DMA)和微观形貌对老化前后复合材料的结构和性能进行分析。对比老化前期和第8周后复合材料的重量变化,老化前期,吸湿率增加,而第8周以后吸湿率反而降低,吸湿率与树脂基体的红外光谱COOH峰的变化趋势基本一致,说明整体的吸湿率与树脂基体的状态密切相关。扫描式电子显微镜(SEM)结果表明,经过长时间的循环老化,表面树脂基本被剥落和刻蚀。DMA结果表明,经过长期的辐照和喷淋的循环,复合材料的玻璃化转变温度不断地减低,而相分离过程可能是老化的主要因素。通过阿累尼乌斯模型建立了循环次数与时间的等效关系。
Accelerating aging of aramid composites was programmed in a weathering chamber. The structure and properties were investigated by Attenuated Total Reflectance Fourier Transform Infrared Spectrometry （ ATR - FT- IR）, Dynamic Mechanical Analysis （DMA） and ballistic tests. The results revealed that the physical aging was the main aging mechanism in this system . The behavior of moisture absorption and desorption were different between the beginning stage and last 8 weeks. The cooperative changes in moisture and FTIR properties were observed. The glass transition temperature （Tg） was affected by aging. It is suggested the phase separation happened during the exposure. An empirical formula was obtained according to the Arrhenius model. This formula can be used to predict the degree of phase separation. Weathering aging had slightly effect on the ballistic performance of the aramid composites.
出处
《合成材料老化与应用》
2012年第5期15-19,4,共6页
Synthetic Materials Aging and Application
