Electrical Conductivity and Microwave Absorbing Properties of Nickel-Coated Multiwalled Carbon Nanotubes/Poly(phthalazinone ether sulfone ketone)s Composites

摘要

Nickel-coated multiwalled carbon nanotubes(Ni-MWNT)were prepared by electroless deposition with ultrasonic vibrations.The morphologies and components were characterized by scanning electron microscope and energy dispersive spectroscopy.Two types of fillers,multiwalled carbon nanotubes(MWNT)and Ni-MWNT,were blended with poly(phthalazinone ether sulfone ketone)s(PPESK)by the solution-mixing method,respectively.The electrical conductivity and microwave absorbing properties of the composites were investigated.The results show that Ni-MWNT/PPESK composites have relatively lower electrical resistivity values than MWNT/PPESK,and in both cases the decrease in electrical resistivity indicates a similar percolation transition behavior in the same MWNT content region.Moreover,as MWNT loading is 5 parts per hundred parts of resin(phr),Ni-MWNT/PPESK composite has the wider frequency region(9.5-13.5 GHz)of the reflection loss(RL)less than-10 dB and the lower minimum value of RL(-27.5 dB)compared with MWNT/PPESK.The better microwave absorption properties can be attributed to the improved dielectric and magnetic properties of the fillers.A good correlation between electrical conductivity and microwave absorption was found for MWNT/PPESK composites.In addition,tensile test and thermogravimetric analysis indicate that introducing Ni-MWNT into PPESK is favorable for the improvement of the mechanical properties and high temperature stability of the composites.