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Effect of coprecipitated barium ferrite on the cure characteristics and dynamic properties of natural rubber–ferrite composites around percolation
Author(s) -
Makled Mahmoud Hosseny Moussa,
Washiya Hirohiko,
Tsuda Hiroshi,
Matsui Toshiyuki
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.30263
Subject(s) - materials science , composite material , natural rubber , ferrite (magnet) , barium ferrite , dynamic mechanical analysis , scanning electron microscope , viscoelasticity , polymer
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