低温氮、氧等离子体处理碳纤维/树脂复合材料

Surface Modification of Carbon Fiber / Resin Composite Material with Low Temperature N_2-O_2-Plasma

采用霍尔源辉光放电产生氧等离子体和氮等离子体,对成型碳纤维/树脂复合材料进行表面处理,通过浸润性分析、红外光谱分析和扫描电镜分析,探究氮、氧等离子体对碳纤维/树脂复合材料的影响,同时考察处理前后碳纤维/树脂复合材料表面基团和形貌的变化。结果显示氮、氧等离子体处理后碳纤维/树脂复合材料与去离子水的接触角随气压和电流的增大均先迅速降低再缓慢增加,在电流为1.0 A,气压为1.0 Pa时,处理结果较佳,氧等离子体处理后碳纤维/树脂复合材料在去离子水中活化时效性稍强于氮等离子体;氮、氧等离子体处理后碳纤维/树脂复合材料表面刻蚀现象明显,粗糙度提高,纤维树脂间粘连程度增加,红外分析表明甲基、酯基被打断,分别引入CH2-O-CH2和C=N、C≡N等极性基团,上述结果表明:氮、氧等离子体处理是提高成型碳纤维/树脂复合材料表面性能的有效方法。

The surfaces of the carbon fiber / resin composite material were modified with N2-O2-plasma,generated by Hall discharge. The influence of the modification conditions,including but not limited to the pressure,plasma current and ratio of N2 and O2flow rates,on the microstructures,compositions and properties of the surfaces was investigated with scanning electron microscopy and infrared spectroscopy. The results show that depending on the modification conditions,the N2-O2-plasma,outperforming the N-plasma,significantly affects the wettability,surface roughness,bond breaking and interfacial adhesion of the carbon fiber and resin. To be specific,as the pressure and plasma current increased,the water-contact angle of the composite changed in a mode of abrupt decrease and slow increase,after storage in di-ionized water,minimized at 1 Pa and plasma current of 1 A. In addition,the plasma strongly increased the interface adhesion of carbon fiber and resin,surface roughness,and the densities of CH2-OCH2,C = N and C≡N polar groups,because of bond-breaking of methyl and ester.