二氧化硅纳米颗粒增强炭纤维/环氧树脂界面性能

Using Silica Nanoparticles Reinforce Interfacial Property of Carbon Fiber/Epoxy Composites

纤维与基体间的界面性能是决定纤维增强树脂基复合材料力学性能的关键因素。采用单纤维断裂实验方法研究二氧化硅纳米颗粒对炭纤维/环氧树脂复合材料界面的增强作用。实验结果表明,涂覆在炭纤维表面和均匀分散在环氧树脂基体中的二氧化硅纳米颗粒含量分别为4.9g/m2和25%(质量分数)时,复合材料界面性能均得到改善,界面抗剪强度相比纯树脂体系分别提高了10.0%和15.0%。通过对纤维断点处双折射光斑和样品断面形貌等信息分析,可知纳米颗粒均匀分散并镶嵌到炭纤维表面沟槽中形成的锁扣结构是界面性能提高的重要原因。

Abstract： Interracial property is a key factor that determines the mechanical performance of fiber rein- forced polymer composites. The interracial property of carbon fiber/epoxy composites was enhanced by addition of silica nanoparticles. The single fiber fragmentation test was employed to investigate the reinforcing mechanism. The results showed that the silica nanoparticles sized on the fiber surface and dispersed in epoxy matrix could significantly improve interracial property. When the content of silica on the surface and in the matrix were 4.9g/m2 and 25%（mass fraction）, the interracial shear strength （IFSS） improved 10.0% and 15： 0% respectively. By analyzing the phenomenon of birefringence and SEM of fracture faces, the perfect dispersion of silica and the mechanical interlocking between nanop- articles and grooves on fiber surface are believed to be the factors sustaining better fiber/matrix inter-facial property.