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Mechanical performance of styrene-butadiene-rubber filled with carbon nanoparticles prepared by mechanical mixing

Saatchi, M. M ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1016/j.msea.2011.05.089
  3. Publisher: 2011
  4. Abstract:
  5. Reinforcement of styrene-butadiene-rubber (SBR) was investigated using two different carbon blacks (CBs) with similar particle sizes, including highly structured CB and conventional CB, as well as multi-walled carbon nanotube (MWCNT) prepared by mechanical mixing. The attempts were made to examine reinforcing mechanism of these two different classes of carbon nanoparticles. Scanning electron microscopy and electrical conductivity measurement were used to investigate morphology. Tensile, cyclic tensile and stress relaxation analyses were performed. A modified Halpin-Tsai model based on the concept of an equivalent composite particle, consisting of rubber bound, occluded rubber and nanoparticle, was proposed. It was found that properties of CB filled SBR are significantly dominated by rubber shell and occluded rubber in which molecular mobility is strictly restricted. At low strains, these rubber constituents can contribute in hydrodynamic effects, leading to higher elastic modulus. However, at higher strains, they contribute in stress hardening resulting in higher elongation at break and higher tensile strength. These elastomeric regions can also influence stress relaxation behaviors of CB filled rubber. For SBR/MWCNT, the extremely great inherent mechanical properties of nanotube along with its big aspect ratio were postulated to be responsible for the reinforcement while their interfacial interaction was not so efficient
  6. Keywords:
  7. Composites ; Electron microscopy ; Mechanical characterization ; Micromechanics ; Polymers ; Strain measurement ; Carbon nano particles ; Composite particles ; Cyclic tensile ; Electrical conductivity measurements ; Elongation at break ; Filled rubbers ; Halpin-Tsai model ; Hydrodynamic effect ; Interfacial interaction ; Low strains ; Mechanical characterization ; Mechanical mixing ; Mechanical performance ; Molecular mobility ; Reinforcing mechanism ; Relaxation analysis ; Rubber shells ; Stress hardening ; Stress relaxation behavior ; Styrene butadiene rubber ; Aspect ratio ; Butadiene ; Electric conductivity ; Multiwalled carbon nanotubes (MWCN) ; Nanoparticles ; Reinforcement ; Residual stresses ; Scanning electron microscopy ; Strain ; Stress relaxation ; Styrene ; Tensile strength ; Rubber
  8. Source: Materials Science and Engineering A ; Volume 528, Issue 24 , September , 2011 , Pages 7161-7172 ; 09215093 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0921509311006526