【摘要】 分别采用稀土改性剂(RES)和环氧氯丙烷(ECP)接枝改性方法对F-12芳纶纤维表面进行改性处理,探讨了RES浓度对于芳纶／环氧复合材料层间剪切强度(ILSS)的影响,初步分析了RES对于F-12芳纶纤维表面作用的机理,应用SEM对复合材料层间剪切断口进行分析,并考察了稀土改性剂处理对于纤维强度的影响。实验结果表明：采用RES进行表面改性处理,稀土元素通过配位化学反应,能够提高芳纶纤维表面活性基团的浓度,从而提高芳纶纤维和环氧树脂基体的界面结合力；当稀土元素含量(ω,％)为0.5时,复合材料的层间剪切强度最好：稀土改性剂处理对于纤维本身的强度几乎没有影响。更多还原

【Abstract】 Solutions of rare earth modifier (RES) and epoxy chloropropane (ECP) grafting modification method were used for the surface treatment of F-12 aramid fiber. The effects of RES concentration on interlaminar shear strength (ILSS) of aramid/epoxy composites were investigated in detail. The mechanism of RES modification on F-12 aramid fiber surface was discussed briefly and the fracture surfaces of ILSS specimens were analyzed by employing SEM. The damage of RES treatment to the fibers was investigated. The results show that RES treatment can increase the concentration of reactive functional groups on fiber surface through chemical coordinating reaction. Thus the interfacial adhesion between aramid fiber and epoxy matrix is promoted obviously. The optimum ILSS is obtained when the content of rare earth elements is 0.5wt％. Meanwhile, the tensile strengths of single fibers are almost not affected by RES treatment.更多还原