Effects of Carbon Black Content on Rheological Properties and Mechanical Properties of Flame-Retardant and Antistatic Polyethylene
A flame-retarded anti-static polyethylene material was developed by adding carbon black into flame retardant polyethylene,and the effects of carbon black content on the electrical properties,rheological properties,and mechanical properties were investigated.The results show that the complex viscosity(η*),storage modulus(G′)and loss modulus(G″)all increase with the increase of carbon black content,but the loss tangent(tan δ)decreases..The carbon black content is more than 2.4％,and the composite forms an over-permeability network,which is characterized by high zero-cut viscosity.With the increase of carbon black content,the surface resistivity of the material decreases,the carbon black content is 2.4％,the surface resistivity rapidly decreases to 3×108 Ω,and the viscoelastic over-permeability point is almost the same as the conductive over-permeability point(both between 2％～3％).With the increase of carbon black content,the impact strength of the material decreases and the fluidity deteriorates.When the carbon black content is 2.4％,the notched impact strength of the material reaches 10.5 kJ/m2,and the melt mass flow rate is 2.0 g/10 min(190℃/2.16 kg).
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