Mechanical Properties of EPDM-blended Polypropylene Filled with CaCO3-talc Hybrid Particles

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  • EPDMブレンドPP/炭酸カルシウム・タルク複合（ハイブリッド）フィラーの力学特性
  • EPDM ブレンド PP タンサン カルシウム タルク フクゴウ ハイブリッド フィラー ノ リキガク トクセイ

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The mechanical properties of ethylene-propylene-diene terpolymer(EPDM)-blended PP/hybridized talc-CaCO3 composite were studied. The hybridized CaC03 (1.4μm)-talc(3.2μm) particles were newly prepared in the presence of stearic acid by using high rotation speed mixer. The composites were prepared by using twin screw extruder. Talc, CaCO3, and EPDM particles were dispersed independently and homogeneously in PP matrix. Impact strength of PP/hybridized talc-CaCO3 composite was superior to PP/talc composite. The impact strength of PP/hybridized talc-CaCO3 composites was remarkably improved by blending, compared with one of PP/talc composites. EPDM-blended PP filled with hybridized filler composites was the excellent material for the balance of modulus and impact strength. The whitening region of the fractured face after Izot impact test was observed by microscope measurement, which is conceivably caused by micro-void at filler surface, PP craze EPDM particles and shear yielding deformation among filler particles. It is clear that the impact strength of composites increases with the volume increase of the whitening region.

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