摘要
利用高能射线对碳纤维(CF)表面进行改性是高效、节能和环保的一种技术.研究了60Co γ-射线辐照下,吸收剂量在0～1000kGy时,聚丙烯腈基CF表面形貌及结构的变化.利用原子力显微镜(AFM)观察处理前后CF表面形貌的变化.采用Raman光谱分析了辐照对CF表面结构的影响,并测定了处理前后CF复丝拉伸强度和不同标距下单丝拉伸强度的变化.结果表明,在0～30kGy剂量处理后的CF表面轴向沟槽数量先增加,ID/IG逐渐增大,石墨微晶尺寸(La)减小;当剂量过大时,沟槽数量减少,沟槽变得又深又宽,ID/IG有所降低,La增加,碳纤维表面结晶度提高.结合双参数Weibull理论,计算处理前后的模数m与La的变化趋势一致,说明小剂量辐照下,对碳纤维表面有细晶化作用,在一定程度上可以提高CF的拉伸强度.随着辐照剂量的增加,促进碳原子的排列更规整,向模量较高的方向转化.
It is a new technique that high-energy radiation modificate on the surface of carbon fiber （CF） which is high efficiency, save energy and environmental protection. Polyacrylonitrile （PAN） based CF was irradiated by ^60Co γ-ray at different absorbed dose （0 ～ 1000kGy）. Atomic force microscopy （AFM） was used for characterized the surface morphology of carbon fiber. At the nanometer scale, AFM images revealed a moderate increase about the amount of grooves at lower absorbed dose （ 〈 30kGy） and decreased at higher absorbed dose. The grooves became deepen and widen as the dose increasing. The Raman curves were fitted by Gaussian-Lorentazian function. It was shown that the structure of the CF slightly alternated by irradiated and that the more dose treatments induced the higher surface crystallinity, as detected by Raman measurements. The CF strength that after irradiated was analyzed by different gauge length single filament strength, which was combined with two-parameters Weibull theory.
出处
《航空材料学报》
EI
CAS
CSCD
2005年第6期52-56,共5页
Journal of Aeronautical Materials
基金
国家自然科学基金重点项目(50333030)
