• rubber ferrite composites;
  • dynamic properties;
  • cure characteristics;
  • barium ferrite


The influence of coprecipitated hexagonal barium ferrite BaFe12O19 phase on the cure characteristics and dynamic properties of natural rubber–ferrite composites has been studied as a function of ferrite loading up to 220 phr (part per hundred part of rubber). Unusual characteristics of coprecipitated ferrite particles were discovered by scanning electron microscope. The results show that scorch time t10 and cure time t90 decrease dramatically with increasing ferrite content up to critical ferrite loading. After 160 phr, t90 increases sharply with increasing ferrite content, in contrast to saturation of t10. Minimum torque recorded normal behavior at low ferrite loading, whereas it decreases with increasing ferrite content at high ferrite loading because of dilution effects. The storage modulus E′ and loss modulus E″ decrease with increasing temperature. The loss tangents (tanδ) of the composites are greater than those of the pure rubber. Linear viscoelastic behavior was observed as a result of the homogeneity and compatibility of the composites. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009