粗糙度对碳纤维/聚芳基乙炔复合材料界面性能的影响

Influence of Roughness on Interfacial Performances of Carbon Fiber and Polyarylacetylene Resin Composites

采用二氧化碳超临界（scCO2）处理碳纤维（CF）表面的方法，研究了粗糙度对碳纤维／聚芳基乙炔（PAA）树脂复合材料界面性能的影响。处理前后的碳纤维通过XPS，AFM和表面能测量进行了表征。CF／PAA复合材料的界面力学性能通过层间剪切强度测试（ILSS）与断口形貌分析进行了评价。结果表明，scCO2处理前后碳纤维表面的化学组成基本上没有变化。随着碳纤维表面粗糙度的增加，CF／PAA复合材料的界面力学性能先增加后减小。其中粗糙度范围为30-45nm的样品有最高的ILSS值，43．36MPa，比未处理的样品提高了44％。对复合材料的ILSS提高起主要作用的因素是碳纤维与PAA树脂的界面齿合作用。而齿合作用程度的不同主要是由于不同粗糙度而引起的碳纤维表面物理状态的不同。

The influence of roughness on interfacial performances of carbon fiber/polyarylacetylene resin composites was studied. To obtain different roughness on the surface of carbon fiber, the carbon fiber was treated by supercritical carbon dioxide. The characteristics of modified carbon fiber surface were evaluated by XPS analysis, AFM analysis and surface energy measurement, respectively. At the same time, the interaction between modified carbon fiber and pelyarylacetylene resin was evaluated by interlaminar shear strength （ILSS） testing, and the failure mechanisms of composites were analyzed by fracture morphologies. The results indicated that the values of lESS firstly increased and then decreased with the carbon fiber surface roughness increased. The sample whose roughness was between 30 - 45nm had the highest ILSS value, 43.36MPa, improved 44% compared with untreated sample. The mechanism responsible for the improvement of interfacial adhesion was physical interlocking at the interface.