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Improvement of mechanical performance of epoxy resins filled with cobalt and chromium powders
Author(s) -
El Homrany M.,
Maaroufi A.,
Benavente R.,
Pereña J. M.,
Pinto G.,
Halim M.
Publication year - 2010
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.32554
Subject(s) - materials science , epoxy , dynamic mechanical analysis , composite material , viscoelasticity , glass transition , percolation threshold , cobalt , percolation (cognitive psychology) , scanning electron microscope , thermomechanical analysis , thermal analysis , relaxation (psychology) , polymer , thermal expansion , thermal , electrical resistivity and conductivity , metallurgy , psychology , social psychology , physics , engineering , neuroscience , meteorology , electrical engineering , biology
Epoxy/ powder metal composites have interesting electrical properties, becoming conductors above the percolation threshold. To complete this study, mechanical investigations have been carried out to show the influence of the fillers on the mechanical performance of these composites. In this framework, different epoxy/metallic powders (Cobalt, Chromium) composites were prepared. Scanning Electron Microscopy showed that the dispersion of the metallic fillers in the matrix is almost homogeneous. The dynamic mechanical thermal analysis (DMTA) measurements showed the dependence of the viscoelastic parameters with the frequency, temperature, nature, and content of fillers. The main relaxations observed are the primary α relaxation (associated to the glass transition, T g ) and a secondary β relaxation. A second DMTA run on the same samples showed a slight increase of the T g . It clearly showed that the used metallic fillers improve the mechanical properties of the obtained composites. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010