Fenton试剂pH值对碳纳米管及其增强酚醛树脂/石墨复合材料性能的影响

Effect of Different pH in Fenton Reagents on the CNTs and Properties of CNTs Reinforced Phenol Formaldehyde Resin/graphite Composite

以经过Fenton/UV处理的碳纳米管作为增强体,酚醛树脂/石墨作为基体,通过热模压成型得到一种质子交换膜燃料电池双极板材料。研究了Fenton试剂预处理前pH值对碳纳米管及其增强的复合材料性能的影响。用红外光谱分析碳纳米管表面官能团的变化,用X射线衍射(XRD)对碳纳米管进行物相分析。结果表明,pH值为3时,碳纳米管表面引入大量的羟基以及少量的羧基;复合材料的性能(抗弯强度以及导电率)随着pH值的增加呈先增加后减小的趋势;pH为3时,复合材料性能最佳,其抗弯强度和导电率分别为67.3 MPa和175.6 s/cm。

Using carbon nanotubes（CNTs） after Fenton/UV treatments at different pH as a reinforcement, and a phenol formaldehyde resin/graphite （PF/G） composite as matrix, a new composite for a bipolar plate was formed by hot-pressing. The effect of different pH in Fenton reagents on the CNTs and properties of CNTs reinforced PF/ G composite were investigated. The functional groups on the surface of CNTs were investigated by FTIR, and the phase analysis of CNTs was investigated by X-ray diffraction analysis （XRD）. The results show ： it is introduced to a large quantity of hydroxyl groups and few carboxyl groups on the sidewalls of the CNTs when pH is 3 in Fenton reagents; the properties （bending strength and conductivity） of composite increase firstly and then decrease with the increasing of pH ; the optimum pH is 3 for the properties of composite, which bending strength and conductivity are 67.3MPa and 175.6s/cm respectively.