Study On Activation Electroless Copper Plating On Carbon Fiber Surface And Copper Coated Carbon Fiber Reinforced ABS Composites

In this paper,ABS resin and copper-coated mesophase pitch-based carbon fibers are used respectively as the matrix and reinforcing material,and the composites were prepared by hot pressing method in this work.Firstly,The effects of conventional SnCl2 sensitization and PdCl2 activation(Pd/Sn activation)pretreatment on the Cu-CF was investigated.The influence of the coating thickness and the interface structure of Cu-CF on conductivity were characterized by SEM,EDS and XRD.We pay more attention to the study the influence of the organosilanes sensitization?PdCl2 activation(Pd/Silan activation)pretreatment on the Cu-CF.The mechanism of the Pd/Silan activation was characterized by FTIR,TG and XPS.The interface structure and the tensile properties were analyzed by SEM and fiber extensometer.The conduction,thermal conductivity and interfacial bonding properties of Cu-CF/ABS composites were also studied.The main conclusions are described as follows:(1)In the process of electroless copper plating,with the extension of the plating time,the grain grows from the spherical particles to the irregular granule grains,and the coating thickness increased,and the coating structure is more compact.At 80 min,the average grain size increased to 37 nm,and the coating thickness increased to 716 nm.With the increase of the thickness of the coating,the interface between the fiber and the coating is weakened.When the coating thickness is between 119 nm and 394 nm,the coating and the fiber show a good interface.The conductivity of Cu-CF was affected by the microcrystal structure and the thickness of copper plating.The resistivity of Cu-CF decreases from 2.24 ×10-4 ?·cm to 1.74×10-5 ?·cm with the grain size and the coating thickness was increased.(2)The coupling time affected the grafting of siloxane on the CF.The oligosilicate was condensed into siloxane polymer with the increase of coupling time,and the coupling effect was reduced,the coupling time on 2 h was better.The N-Pd coordination bond increased the bonding strength between the coating and the fiber by form the chemical association of the amino group-NH2 at the terminal of the siloxane molecule with Pd2+.Pd/Sinlan activated CF was showed a good copper plating,the copper coating tended to be more uniform and complete.The copper-coated carbon fibers were processed by Pd/Sinlan activation with good interfacial cohesion between the copper film and fiber,and there was no peeling.The conductivity of CF was improved,and the copper fiber strength of the discrete was reduced.(3)The copper player enhanced the adhesion between fiber and resin,and the coating of nano-thickness on the fiber surface enhances the interface between fiber and resin.With the fiber content increasing,the hardness of Cu-CF/ABS composite was increased.The resistivity of Cu-CF/ABS composites was reduced with the coating thickness was increased.The resistivity of the composites decreases to 0.12 ?·cm when the thickness of the coating at 695 nm.When the content of Cu-CF is 20%,the resistivity of the composites is reduced to 5.87x10-5 ?·cm,which is lower than the resistivity of CF/ABS composites.When the temperature is higher than the thermal transition temperature Th,the negative temperature effect(NTC)of Cu-CF/ABS composites was appeared,with the Cu-CF content increasing,the composites possess good sensitive performance during the content at 20%.Cu-CF/ABS composites have significant anisotropy in the thermal conductivity of the plane and the cross-section.The thermal conductivity of the composites was improved by the coating on the surface of the carbon fiber.When the Cu-CF content is 10%,the thermal conductivity of the cross-section was to 1.57 W/m·K.