论文部分内容阅读
为提高芳纶纤维与复合材料基体间的界面强度,首先,使用LiCl乙醇溶液处理芳纶纤维一定时间;然后,对LiCl处理芳纶纤维表面的化学组成、微观形貌、单丝拉伸强度及芳纶纤维/环氧树脂复合材料的界面性能等进行了测试分析。结果表明:使用LiCl乙醇溶液处理芳纶纤维后,芳纶纤维表面的含氮官能团含量增加;处理后,芳纶纤维表面有刻蚀出的沟槽,表面粗糙度增大,进而改善了芳纶纤维与环氧树脂基体的界面粘接性能,使芳纶纤维/环氧树脂复合材料的层间剪切强度由处理前的21.75 MPa提升到37.98 MPa;最佳处理时间为3~4h,而处理时间过长会导致芳纶纤维的单丝拉伸强度及复合材料的层间剪切强度下降。所得结论证实使用LiCl处理芳纶纤维是一种有效的表面改性方法。
In order to improve the interfacial strength between the aramid fiber and the composite matrix, the aramid fibers were treated with LiCl ethanol solution for a certain period of time. Then, the chemical composition, morphology, monofilament tensile strength, Aramid fiber / epoxy composites interface properties were tested and analyzed. The results showed that the content of nitrogen-containing functional groups on the surface of aramid fibers increased after the aramid fiber was treated with LiCl ethanol solution. After the treatment, grooves were etched on the surface of the aramid fiber and the surface roughness increased, The interfacial adhesion between fiber and epoxy matrix enhanced the interlaminar shear strength of aramid fiber / epoxy composite from 21.75 MPa to 37.98 MPa before treatment; the best treatment time was 3 ~ 4 h, while the treatment If the time is too long, the tensile strength of the monofilament of the aramid fiber and the interlaminar shear strength of the composite material decrease. The conclusions obtained show that LiCl treatment of aramid fiber is an effective surface modification method.