酚醛树脂表面处理剂对炭纤维增强环氧树脂复合材料界面强度的影响

Influence of phenolic resin surface treatment agent on interfacial adhesion of carbon fiber reinforced epoxy resin composites

采用酚醛树脂作为炭纤维表面处理剂,可以显著提高多种炭纤维和环氧树脂界面强度。通过XPS、AFM、SEM和层间剪切强度等方法,研究了不同浓度的酚醛树脂表面处理剂对炭纤维增强环氧树脂复合材料层间剪切强度、炭纤维表面元素和化学键组成的影响,以及炭纤维增强环氧树脂复合材料断面微观形貌的变化。XPS和AFM分析结果表明酚醛树脂和炭纤维表面发生了化学反应,而且酚醛树脂处理剂浓度越高,和炭纤维表面发生反应的基团也越多,表面越光滑平整,SEM和层间剪切强度研究表明酚醛树脂处理后的复合材料界面粘结性能得到很大的改善,而且界面粘结性能强烈依靠处理剂浓度。

To enhance the interfacial adhesion between the carbon fibers and the epoxy resin matrix, the phenolic resin surface treatment agent is used. The influences of different concentrations of the phenolic resin treatment agent on the interfacial adhesion of the carbon fiber reinforced epoxy resin composites were investigated by interlaminar shear strength （ILSS）, atomic force microscopy （AFM）, X-ray photoelectron spectroscopy （XPS） and scanning electron microscopy （SEM）. The results of XPS and AFM analysis indicate that the interface of carbon fiber is graf- ted by the phenolic resin surface treatment agent. The surface of carbon fiber becomes more and more smooth if the concentration of the phenolic resin surface treatment agent increases. The results of SEM and ILSS indicate that with the increasing of the concentration of the phenolic resin agent the interfacial adhesion is improved greatly.