催化剂加载对连续碳纤维表面生长碳纳米管的影响

通过化学气相沉积(CVD)在碳纤维表面还原得到均匀细小的催化剂颗粒并在碳纤维表面催化生长了均匀、规整的碳纳米管(CNTs)。系统研究了催化剂种类以及浓度对碳纳米管产量和微观组织结构的影响,探究了碳纤维的浸润性能和单丝强度的变化。结果表明,Ni的催化活性最高,Co的催化活性适中,产生的CNTs较为均匀、规整,当催化剂浓度为0.02mol/L时,碳纤维表面生长CNTs多尺度增强体的拉伸强度最大。碳纤维表面生长CNTs,促使碳纤维的表面粗糙度增加,与树脂之间的结合变强,从而提高了碳纤维与环氧树脂之间的浸润性。

Effects of Catalysts for Growing Carbon Nanotubes on the Continuous Carbon Fiber Surface

To systematically study the effects of the catalyst type and concentration on the yield and microstructure of carbon nanotubes(CNTs) on the surface of carbon fiber, the change in wetting properties and tensile strength of carbon fiber was explored. It has been reported that a uniform and fine catalyst particles was coated on the surface of carbon fiber, and the corresponding carbon nanotubes on the surface of carbon fiber also was attained by chemical vapor deposition techniques(CVD). According to the resultant analysis, Ni has the highest catalytic activity, Co has the middle catalytic activity and the corresponding CNTs produced are more uniform and regular. When the concentration of Co catalyst is about 0.02 mol/L, the tensile strength reaches the maximum of carbon fiber surface growing CNTs multi-scale reinforcement. The carbon nanotubes growing on the continuous carbon fiber surface could increase the surface roughness of the carbon fibers and enhance the bonding area between the resin and the carbon fibers, also sharply improve the wettability between the carbon fiber and epoxy resin.