Effect of coprecipitated barium ferrite on the cure characteristics and dynamic properties of natural rubber–ferrite composites around percolation

✍ Scribed by Mahmoud Hosseny Moussa Makled; Hirohiko Washiya; Hiroshi Tsuda; Toshiyuki Matsui

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 403 KB
• Volume: 113
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.30263

✦ Synopsis

Abstract

The influence of coprecipitated hexagonal barium ferrite BaFe~12~O~19~ 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 t~10~ and cure time t~90~ decrease dramatically with increasing ferrite content up to critical ferrite loading. After 160 phr, t~90~ increases sharply with increasing ferrite content, in contrast to saturation of t~10~. 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