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Sequences of fracture toughness micromechanisms in PP/CaCO3 nanocomposites

Lesan Khosh, R ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1002/app.28909
  3. Publisher: 2008
  4. Abstract:
  5. Mechanical properties and fracture toughness micromechanisms of copolypropylene filled with different amount of nanometric CaCO3 (5-15 wt %) were studied, J-integral fracture toughness was incorporated to measure the effect of incorporation of nanoparticle into PP matrix. Crack-tip damage zones and fracture surfaces were studied to investigate the effect of nanofiller content on fracture toughness micromechanisms. It was found that nanofiller acted as a nucleating agent and decreased the spherulite size of polypropylene significantly, J-integral fracture toughness (Jc) of nanocomposites was improved dramatically. The Jc value increased up to approximately two times that of pure PP at 5 wt % of nano-CaCO3. The fracture micromechanisms varied from rubber particles cavitation and shear yielding in pure PP to simultaneous existence of rubber particles cavitation, shear yielding, filler particles debonding, and crazing in PP/CaCO3 nanocomposites. © 2008 Wiley Periodicals, Inc
  6. Keywords:
  7. Cavitation ; Fracture ; Hydrodynamics ; Mechanical properties ; Metallic matrix composites ; Nanocomposites ; Polymer matrix composites ; Polypropylenes ; Pumping plants ; Rubber ; Toughness ; Damage zones ; Filler particles ; Fracture surfaces ; Micro mechanisms ; Nanometric ; Nucleating agents ; Pp matrixes ; Rubber particles ; Shear yielding ; Spherulite sizes ; Fracture toughness ; Filling material ; Nanocomposite ; Physical property ; Polypropylene ; Synthetic rubber
  8. Source: Journal of Applied Polymer Science ; Volume 110, Issue 6 , 2008 , Pages 4040-4048 ; 00218995 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/app.28909