Journal of Materials Science

, Volume 41, Issue 8, pp 2291–2300 | Cite as

Mechanical properties of talc- and CaCO3-reinforced high-crystallinity polypropylene composites

  • J.-I. Weon
  • H.-J. SueEmail author


Toughening mechanisms and mechanical properties of two high-crystallinity polypropylene (hcPP)-based composite systems, hcPP/talc and hcPP/CaCO3, are investigated. Significant improvement in tensile modulus is observed in the PP/talc composite, but only a moderate improvement is found for hcPP/CaCO3. The introduction of CaCO3 nanoparticles to hcPP helps nucleate a measurable amount of β-phase crystals and results in a significant drop in crystallization temperature, suggesting a possible retardation of hcPP crystallization. In addition, the hcPP/CaCO3 nanocomposite shows more pronounced damping characteristics than that of hcPP/talc, throughout the temperature range studied. A detailed investigation of fracture mechanisms suggests that well-dispersed, highly oriented talc particles cause embrittlement of hcPP. Only when the crack extends toward the edges of the specimen will the crack deflection/bifurcation and microcracking mechanisms initiate. In the case of hcPP/CaCO3, the CaCO3 nanoparticles help trigger massive crazing and shear yielding if the testing speed is in quasi-static. The presence of β-phase crystals around the CaCO3 particles could facilitate the formation of crazes throughout the hcPP matrix. Approaches for toughening hcPP are discussed.


Polymer Mechanical Property Crystallization Polypropylene Fracture Mechanism 


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© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  1. 1.Polymer Technology Center, Department of Mechanical EngineeringTexas A & M UniversityCollege StationUSA

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