THE FRACTURE MECHANISM OF POLYAMTOE 6/ EPDM-M/ NANO-CACO3 TERNARY COMPOSITES WITH 'SANDBAG' STRUCTURE

摘要

The fracture behavior of Polyamide 6 (PA6)/maleated mixed with unmaleated ethylene-propylene-diene rubber (EPDM-M)/ nano-calcium carbonate (nano-CaCC>3) prepared by two step was studied. The fracture energy was studied by a single-edge notch (SEN) tensile test as function of test speed. The morphologies of impact fracture and tensile deformation processes were investigated by scanning electron microscope (SEM). The result shows that ternary composites with "sandbag" structure has higher fracture energy at high test speed, compared to pure PA6. The research of morphologies during different tensile deformation processes illuminates that the "sandbag" structure is more effective for resisting the crack propagation compared to the crack initiation, which exhibits high crack propagation energy (CPE) but low crack initiation energy (CIE).