双面包覆碳纳米纸复合材料的湿热性能研究

Study on Hygrothermal Properties of Composite Material Covered with Carbon Nanotube Buckypaper on Double Sides

摘要: 复合材料的应用环境对材料本身的性能等都有着极大的影响，而其中又以湿热环境最为常见，所以研究其在湿热环境下的特性是很有必要的。本文使用水煮法对双面包覆碳纳米纸复合材料进行加速湿热老化试验。实验结果表明：双面包覆碳纳米纸复合材料在湿热处理的初期，吸湿率的增长符合Fick第二定律。湿热处理在0~29.5 h时间范围内，其吸湿率呈线性增加，随后吸湿率增长不再呈线性增长，而是速度减慢并逐渐趋于平稳，在湿热处理时间为221.5 h时达到饱和，饱和吸湿率为1.7%。面层不含碳纳米纸的复合材料也呈现相同变化趋势，在173.5 h时达到饱和，饱和吸湿率为1.705%，水分子扩散系数为0.381 mm2/s，吸湿速率为0.17 s−1。层间剪切强度与弯曲强度的测试结果表明：二者的力学性能均随着湿热处理时间的增加而降低。

Abstract: The application environment of composites has great influence on the performance of materials, and the hygrothermal environment is the most common one. Therefore, it is necessary to study the characteristics of composites in the hygrothermal environment. In this paper, the accelerated wet-thermal aging test of composites covered with carbon nanotube buckypaper on double sides was carried out by boiling method. The experimental results show that the hygroscopicity of double-sided carbon nanotube buckypaper composites increases in accordance with Fick’s second law at the initial stage of hydrothermal treatment. Within the time range of 0~29.5 h, the moisture absorption rate increased linearly, and then the moisture absorption rate did not increase linearly, but slowed down and gradually stabilized. Saturated moisture absorption rate reached 1.7% when the time of hydrothermal treatment was 221.5 h. The composites without carbon nanotube buck-ypaper on the surface also showed the same trend. Saturated moisture absorption rate was 1.705% at 173.5 h, water molecular diffusion coefficient was 0.381 mm2/s and moisture absorption rate was 0.17 s−1. The test results of interlaminar shear strength and flexural strength show that the mechanical properties of the two materials decrease with the increase of heat treatment time.