氧化处理对碳纤维表面碳纳米管修饰效果及其电磁性能的影响研究

Effect of oxidation treatment on the carbon nanotube grafting carbon fiber composites and their electromagnetic properties

针对碳纤维和碳纳米管作为吸波剂单独使用时存在的吸波机制单一、分散困难、无法实现宽频强吸收等问题,采用化学接枝法在酸氧化的碳纤维表面成功制备了碳纳米管,并研究了氧化处理对碳纤维表面碳纳米管接枝效果及其电磁性能的影响。结果表明,氧化处理可提高CNT的接枝量和接枝效率,进而提高其介电常数和对电磁波的损耗性能。当硝酸浓度65%,反应时间8h时,CF表面CNT接枝率达到15.3%且无团聚发生,对电磁波具有较好的吸收效果。

In order to solve the problems such as singleness of the absorption mechanism,difficulty of dispersion and inability of broadband absorption,carbon nanotubes were successfully prepared on the surface of acid oxidized carbon fiber by chemical grafting method.The effect of oxidation treatment on the carbon nanotubes modified carbon fiber and their electromagnetic properties were investigated.The results showed that the graft amount and graft efficiency of CNT were improved by oxidation treatment,resulting in the enhancement of the dielectric constant and the electromagnetic wave loss performance.At the condition of the nitric acid concentration of 65%and the reaction time of 8 h,the grafted CNTs on the surface of CF reached 15.3%without agglomeration,which showed a good electromagnetic wave absorption property.