碳纤维在电化学处理中的拉曼光谱研究  

Raman Spectra of Carbon Fibers during Electrochemical Treatment

作　　者：张敏[1,2] 朱波[2] 王成国[2] 魏晗兴[2] 

机构地区：[1]山东大学材料液态结构及其遗传性教育部重点实验室,山东济南250061 [2]山东大学碳纤维工程技术研究中心,山东济南250061

出　　处：《光谱学与光谱分析》2010年第1期105-108,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(50673052);国家"973"项目(2006CB605314)资助

摘　　要：采用激光拉曼光谱研究了电化学改性处理过程中聚丙烯腈基碳纤维的表面微结构变化,分析了不同处理时间下碳纤维的一级拉曼光谱特性。结果表明:碳纤维的一级拉曼光谱可以拟合为4个峰,即D(D_1),G,D_2和D_3,表征碳纤维表面微结构变化的拉曼参数主要有D线和G线的积分面积比R(I_D/I_G),D_2线与G线的积分面积比I__(D_3)/I_G,D_3线与G线比I_(D_3)/I_G以及所有无序结构积分面积总和与G线积分面积的比值I_(D_S)/I_G。电化学处理后,碳纤维表面无序度增大,D线和G线交叠度减小,R增大,I_(D_3)/I_G增大,I_(D_2)/I_G减小。随着处理时间的增加,I_(D_S)/I_G不断增大,它与R值的变化趋势基本一致,并且可以更全面表征碳纤维表面结构有序性的变化。因此,利用激光拉曼光谱可以研究电化学改性处理过程中碳纤维表面的微结构变化规律。Laser Raman spectroscopy was employed to characterize the microstructure variations of polyacrylonitrile-based carbon fibers during electrochemical treatment, and the characteristics of first-order Raman spectra of carbon fibers with different treat ment time were investigated in the present paper. The results indicate that the Raman spectra of the carbon fibers can be fitted into four bands, named as D （or D1 ） band, G band, D2 band and D3 band, respectively. The Raman parameters to characterizesurface microstructure variations of carbon fibers mainly include R（ID/IG, area ratio of D band and G band）, ID2/IG （area ratio of D2 band and G band）, ID3/IG （area ratio of Da band and G band）, and IDS/IG （area ratio of all the disordered structure and G band）. The peak separation between D band and G band becomes large after electrochemical treatment. R increases, which indi cates that the surface disordered degree of carbon fibers increases. ID3/IG increases, which is caused by organic molecules, fragments or functional groups; decreases which is caused by the break of the aliphatic structures. With increasing treatment time, IDS/IG increases continuously, and the change trend of IDS/IG is consistent with that of R value, which can be used to compre hensively explain the variation of the surface structure of carbon fibers. So, the variety rules of the structure of carbon fibers can be investigated by laser Raman spectroscopy during electrochemical treatment.

关 键 词：拉曼光谱 碳纤维 微结构 电化学改性 

分 类 号：TQ342.7[化学工程—化纤工业]