中文摘要：

采用熔融法分别制备了三元乙丙橡胶（EPDM）／纳米碳酸钙（CaCO3）二元预混料及其与聚丙烯（PP）共混的三元复合材料。利用动态力学分析仪研究了纳米CaCO3含量和共混时间对EPDM／纳米CaCO3二元预混料的动态力学性能的影响，利用扫描电子显微镜分析了分散相纳米CaCO3和EPDM在PP基体中的形态。结果表明，常温下，纳米CaCO3含量为70％（质量分数，下同）、共混时间为15min时，EPDM／纳米CaCO3二元预混料的储能模量、损耗模量和损耗角正切的值最高；纳米CaCO3与EPDM组成的二元共混物分散于PP基体中，通过纳米CaCO3团聚体及EPDM协同变形、界面脱黏成纤及诱导剪切带的形成耗散外界作用能，显著提高了PP／EPDM／纳米CaCO3三元复合材料的冲击强度。

英文摘要：

Ethylene-propylene-diene monomer （EPDM）/nano calcium carbonate（nano-CaCO3 ） masterbatch was prepared in an internal mixer, which was subsequently introduced into polypropylene （PP） leading to a ternary composite. The influences of the nano-CaCO3 dosage and the mixing time on the dynamic mechanical property of EPDM/nano-CaCO3 masterbatch were characterized by a dynamic mechanical analyzer. The morphology of nano-CaCO3 and EPDM dispersed in PP matrix were observed by scanning electron microscope. It showed that while blending for 15 min at room temperature, the storage modulus, loss modulus and loss tangent of EPDM/70 % nano-CaCO3 composite all reached their optimal values. In the ternary composites, a large amount of energy was dissipated by mechanisms of collaborative deformation of nano-CaCO3 agglomerate and EPDM, the fibrillation induced by interfacial debonding, and shear banding of PP matrix, which markedly improved the toughness.