Proceedings of the Polymer Society of Korea Conference (한국고분자학회:학술대회논문집)

The Polymer Society of Korea (한국고분자학회)
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Effect of Calcium Carbonate Nanoparticle on the Toughening Mechanisms of Polypropylene Nanocomposite

  • Weon, Jong-Il (Reliability Assessment Center, Korea Research Institute of Chemical Technology) ;
  • Choi, Kil-Yeong (Reliability Assessment Center, Korea Research Institute of Chemical Technology)
  • Published : 2006.10.13
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Abstract

The toughening mechanisms of polypropylene (PP) containing 9.2 vol % of calcium carbonate ($CaCO_{3}$) nanoparticles were investigated using optical microscopy and transmission electron microscopy. Double-notch four-point bending (DN-4PB) Charpy impact specimens were utilized to study the fracture mechanism(s) responsible for the observed toughening effect. A detailed investigation reveals that the $CaCO_{3}$ nanoparticles act as stress concentrators to initiate massive crazes, followed by shear banding in PP matrix. These toughening mechanisms are responsible for the observed improved impact strength.

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