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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 effect of roughness on the interfacial properties of carbon fiber / polyarylacetylene (PAA) resin composites was investigated by treating carbon fiber (CF) surface with carbon dioxide supercritical (scCO2). Carbon fibers before and after treatment were characterized by XPS, AFM and surface energy measurements. The interface mechanical properties of CF / PAA composites were evaluated by interlaminar shear strength test (ILSS) and fracture surface analysis. The results showed that there was almost no change in the chemical composition of the surface of carbon fibers before and after scCO2 treatment. With the increase of carbon fiber surface roughness, the interface mechanical properties of CF / PAA composites first increase and then decrease. The samples with roughness in the range of 30-45 nm had the highest ILSS value of 43.36 MPa, an increase of 44% over the untreated samples. The main contributor to the ILSS improvement of composites is the interfacial interaction between carbon fibers and PAA resin. The different degree of tooth cooperation is mainly due to different roughness caused by the carbon fiber surface physical state of the different.