CAJ | 학술논문

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,并且可以更伞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.
채용격광랍만광보연구료전화학개성처리과정중취병희정기탄섬유적표면미결구변화,분석료불동처리시간하탄섬유적일급랍만광보특성.결과표명:탄섬유적일급랍만광보가이의합위4개봉,즉D(D_1),G,D_2화D_3,표정탄섬유표면미결구변화적랍만삼수주요유D선화G선적적분면적비R(I_D/I_G),D_2선여G선적적분면적비I_(D_3)/I_G,D_3선여G선비I_(D_3)/I_G이급소유무서결구적분면적총화여G선적분면적적비치I_(D_S)/I_G.전화학처리후,탄섬유표면무서도증대,D선화G선교첩도감소,R증대,I_(D_3)/I_G증대,I_(D_2)/I_G감소.수착처리시간적증가,I_(D_S)/I_G불단증대,타여R치적변화추세기본일치,병차가이경산면표정탄섬유표면결구유서성적변화.인차,이용격광랍만광보가이연구전화학개성처리과정중탄섬유표면적미결구변화규률.
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 treatment 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 D_1 ) band, G band, D_2 band and D_3 band, respectively. The Raman parameters to characterize surface microstructure variations of carbon fibers mainly include R(I_D/I_G, area ratio of D band and G band), I_(D_2) /I_G(area ratio of D_2 band and G band),I_(D_3) /I_G(area ratio of D_3 band and G band), and I_(D_S) /I_G(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 indicates that the surface disordered degree of carbon fibers increases. I_(D_S) /I_G 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, I_(D_S)/I_G increases continuously, and the change trend of I_(D_S)/I_G is consistent with that of R value, which can be used to comprehensively 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.