Fabrication of CPNBRs/epoxy composites with excellent impact strength, ideal thermal stabilities and dielectric properties

Carboxyl powdery nitrile rubbers (CPNBRs) are blended with bisphenol A epoxy resin (E-51) to produce the corresponding CPNBRs/E-51 composites via casting method. The effects of the percentage mass of the CPNBRs on the impact strength, thermal stabilities and dielectric properties of the CPNBRs/E-51 composites are discussed and investigated. The impact strength of the resulting CPNBRs/E-51 composites is found to be optimal with 5 wt% addition of CPNBRs, enhanced from 14.2 kJ/m(2) to 20.8 kJ/m(2), increased by 46.5%. In addition, the dielectric constant and dielectric loss values of the resulting CPNBRs/E-51 composites are increased slightly, but the thermal stabilities are decreased with the increasing addition of CPNBRs.