镀铜CF/ABS树脂复合材料的导电性能

通过在中间相沥青基炭纤维表面化学镀铜以提高纤维导电性能,并以热压法制备了短切镀铜炭纤维(Cu-CF)增强ABS树脂导电复合材料。采用SEM、EDS、XRD等表征方法研究了Cu-CF的镀层厚度、Cu-CF界面结构,以及镀铜厚度和Cu-CF的含量对复合材料导电性能的影响。研究表明,化学镀铜是铜晶粒不断长大与晶体结构更加致密的过程。Cu-CF的界面粘结受镀层厚度的影响,随着镀层厚度的增加,镀层与纤维之间出现间隙。Cu-CF的电阻率随镀层厚度的增加急剧降低,当镀层厚度增大至695nm后电阻率趋于稳定。采用镀层厚度为632nm的Cu-CF为增强相,当其体积含量为20%时,Cu-CF/ABS复合材料的电阻率为5.87×10-4Ω·cm,在导电功能材料领域具有很好的应用前景。

Electrical Conductivity of Copper-coated CF/ABS Composites

The copper-coated mesophase pitch-based carbon fibers (Cu-CF)were prepared by electroless copper plating for im-proving the conductivity of CF,and the Cu-CF reinforced ABS resin (Cu-CF/ABS)composites were prepared using hot-pressed method.The surface morphology and microcrystalline structure of Cu-CF were characterized by SEM,EDS and XRD.The relation-ship between the thickness of copper layers as well as the interface structure of Cu-CF and the conductivity of composites was investi-gated.The results showed that the electroless copper plating was a grain size growing and crystal structure compacting process for achieving copper layers on the surface of carbon fiber.The resistivity of the Cu-CF decreased rapidly as increasing the thickness of copper layers,and the resistivity of the Cu-CF slowed to a constant level when the thickness of copper layers over 695 nm.Moreo-ver,the Cu-CF/ABS composites presented excellent conductivity of 5.87×10-4 Ω·cm when the resultant Cu-CF (thickness of 632 nm)used as strengthening phases with volume fraction of 20％.Therefore,the Cu-CF/ABS composites showed a great potential ap-plication for conductive functional materials.