PAN基碳纤维表面液相氧化改性研究

Liquid-Phase Oxidation Modification of PAN-Based Carbon Fiber Surface

利用拉曼光谱(Raman),红外光谱(IR)和扫描电镜(SEM)对经过KClO3/H2SO4液相改性处理的碳纤维(CF)表面结构进行了研究,并初步讨论了微观结构对碳纤维单丝力学性能的影响。结果表明:纤维表面的沟槽随改性处理时间增加逐渐加深;表面处理的刻蚀作用会使晶粒边界活性增大,石墨微晶变小;改性处理能够增加CF表面活性官能团(羧酸(—C=O)和酚羟基(—OH)),降低碳纤维表面惰性;表面处理后纤维的力学性能均有所下降,液相氧化处理60min和120min后,拉伸强度分别降低约15%和50%。

The change of the microstructure of carbon fiber with liquid-phase oxidation modification was investigated under different treatment conditions by Raman spectroscopy（Raman）,Infrared spectroscopy（IR）,and Scanning electron microscope（SEM）.The relationship between microstructure and mechanical properties of monofiber was also studied.The results indicate that surface etching increases surface groove.Acid treatment shows an obvious positive effect on the chemical modification of carbon fiber surface,it increases the grain boundary activity and surface acidic functional groups（—C = O and —OH）,while the graphite microcrystalline decrease.The mechanical properties of the carbon fiber decline after acid treatment.The tensile strength decreases about 15% and 50% respectively,when the times for the liquid-phase treatment are 60min and 120min.