等离子体处理对CF/PI复合材料高温界面性能的影响

Effect of Plasma Treatment on Interfacial Properties of CF/PI Composites at Elevated Temperatures

用氩气电感耦合射频等离子体(ICP)处理碳纤维的表面,研究了改性碳纤维增强聚酰亚胺树脂基复合材料300℃的界面性能。分别使用扫描电子显微镜(SEM)、原子力显微镜(AFM)等手段和测试X光电子能谱(XPS),研究了氩气等离子体处理时间对连续碳纤维改性前后纤维表面的形貌、粗糙度和化学组分的影响,以及碳纤维增强聚酰亚胺树脂基(CF/PI)复合材料的300℃界面强度的变化规律。结果表明,用氩气等离子体处理7 min(最佳时间)后碳纤维表面的形貌变得粗糙,结构凹凸不平,氧含量从11.43%提高到16.28%,极性官能团-C-O-的含量提高到14.37%。纤维表面浸润性的提高使碳纤维与聚酰亚胺树脂基体300℃的层间剪切强度(ILSS)从76 MPa提高到86.2 MPa。

The interfacial properties of modified carbon fiber reinforced polyimide resin matrix composites at 300℃were studied by using argon inductively coupled radio-frequency plasma(ICP).Scanning electron microscopy(SEM),atomic force microscopy(AFM),X-ray electron spectroscopy(XPS)and other analytical test methods were used to systematically study the effects of argon plasma treatment time on the morphology,roughness and chemical composition of fiber surface before and after continuous carbon fiber modification,and the change law of the interface strength of Carbon fiber reinforced polyimide resin matrix(CF/PI)composites at 300℃.The results show that after the optimal time of argon plasma treatment for 7 min,the morphology of the carbon fiber surface becomes rough,the structural characteristics of unevenness appear,the surface oxygen element content increases from 11.43%to 16.28%,the polar functional group-C-O-content increases to 14.37%,and the wettability of the fiber surface increases.The interlayer shear strength(ILSS)value of carbon fiber and polyimide resin matrix increased from 76 MPa to 86.2 MPa at 300℃,indicating that argon plasma treatment can improve the interfacial properties of CF/PI composites at 300℃.