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中文摘要：
为了使气相生长碳纤维（VGCF）能更好地作为高分子基体的增强材料,采用双氧水和硝酸（H2O2和HNO3）二步处理法、硅烷偶联剂处理法及H2O2和HNO3处理后再用硅烷偶联剂处理的联用改性法分别对VGCF进行表面改性处理,研究表面改性对VGCF微观结构的影响。利用AFM、FTIR、TG和XRD比较分析了改性处理对VGCF的表面微观结构、官能团、热稳定性和晶格等的影响。结果表明：3种处理方法对VGCF晶格无明显影响;H2O2和HNO3二步处理法能在纤维表面接枝羧基等含氧基团;硅烷偶联剂处理法能使纤维表面接枝硅氧烷低聚物;H2O2和HNO3处理后再用硅烷偶联剂处理联用改性VGCF,能使其表面接枝上更多的硅氧烷低聚物,有利于提高VGCF与高分子材料的亲和性。
英文摘要：
For the better utilization of vapor grown carbon fiber（VGCF） as the reinforcing material in polymer matrix composites,the VGCF surface was modified by three methods,the two-step treatment with hydrogen peroxide and concentrated nitric acid,treatment with the silane coupling agent,and the treatment with hydrogen peroxide and concentrated nitric acid combined with the silane coupling agent,respectively.The effects of surface modification on the microstructure of VGCF were studied and comparatively analyzed by AFM,FTIR,TG and XRD.The results show that the three modification methods have no significant effect on the crystal lattice of VGCF.Oxygen-containing groups such as carboxyl groups can be grafted onto the surface of VGCF through the two-step treatment with hydrogen peroxide and concentrated nitric acid.And siloxane oligomer can be grafted on the surface of VGCF through the modification with silane coupling agent.More siloxane oligomers can be grafted onto the surface of VGCF by the treatment with hydrogen peroxide and concentrated nitric acid combined with the silane coupling agent,which may be of great benefit to the improvement of the compatibility between VGCF and polymer matrix materials.
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