采用空气氧化法和硝酸氧化法对碳纤维进行表面处理,研究了碳纤维(CF)增强热塑性聚酰亚胺(TPI)复合材料的力学性能.采用Boehm滴定方法测定了经过硝酸处理后CF表面酸性官能团数量.结果表明:CF表面酸性官能团的数量随着浓硝酸处理时间的增加而增加;浓硝酸处理效果比空气氧化好,当浓硝酸处理CF的时间为20 min时,CF/TPI复合材料拉伸强度和弯曲强度分别提高10%和14%,XPS表明此时CF表面活性官能团比未处理增加35.89%.AFM表明,浓硝酸对CF表面刻蚀沟明显;SEM表明,CF与TPI基体之间形成良好的界面,CF起到了增强效果.
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