Effect of the Surface Morphology of Calcium Carbonate on the Impact Toughness of Polyamide 6/EPDM-M/CaCO3 Ternary Composites

Yu Xin Dong; Yong Jie Wang; Xiao Peng Xu; Si Chen; Yan Qin Shi; Xu Wang; Jia Yuan Shen; Xiang Bin Xu

doi:10.4028/www.scientific.net/AMR.391-392.1259

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 391-392Effect of the Surface Morphology of Calcium...

Effect of the Surface Morphology of Calcium Carbonate on the Impact Toughness of Polyamide 6/EPDM-M/CaCO3 Ternary Composites

Abstract:

Ternary composites of polyamide 6 (PA6), mixed with unmaleated ethylene propylene diene terpolymer rubber (named as EPDM-M) and calcium carbonate (CaCO₃, with three different kinds of surface morphology) were prepared via two-step melt blending process. The influence of surface morphology of CaCO₃ on the impact toughness of PA6/EPDM-M/CaCO₃ was investigated. It was found that the Izod impact strength of the composites improved with increasing of the surface area of CaCO3. The characterization of CaCO₃ by BET tester and scanning electron microscope (SEM) obviously showed that both needle-shaped CaCO₃ and spherical CaCO₃ were have a bigger specific surface area and rougher morphology than ground CaCO3. So they have a better toughen effect, which was well explained the results of impact test. Morphology observed on the impact fracture revealed that the formation of voids by the debonding of CaCO₃, which could trigger the matrix emerged obvious plastic deformation in the composites that included needle-shaped CaCO₃ or spherical CaCO3. This phenomenon also can be demonstrated that needle-shaped CaCO₃ and spherical CaCO₃ had superior toughen effective. Consequently, the surface morphology of CaCO₃ had a distinctive effect on the toughness of PA6/EPDM-M/CaCO₃ Composites.