Add time:07/29/2019         Source:sciencedirect.com

The effects of various heterogeneous nucleating agents (i.e. sodium benzoate, talcum, dimethyl dibenzylsorbitol, and a combination of calcium stearate and pimelic acid) on the mechanical properties of heterophasic copolymer of isotactic polypropylene and ethylene–propylene rubber (iPP/EPR blend) were investigated for a fixed filler loading of 0.1 wt%. Only the sample filled with a combination of calcium stearate and pimelic acid (Ca-Pim) exhibited a greater notched Izod impact strength value than that of the unfilled sample. The effect of Ca-Pim addition at various loadings was further investigated and the results revealed that iPP/EPR blend loaded with 0.001 wt% Ca-Pim showed the greatest improvement in the notched Izod impact strength (an increase of ca. 3.5-fold over that of the unfilled sample) at the expense of both the tensile strength at yield and flexural modulus. It was concluded, based on wide-angle X-ray diffraction, differential scanning calorimetry and scanning electron microscopy results, that the presence of the β-crystals (with the Kβ value being 0.75) was responsible for the great improvement in the notched Izod impact strength observed.

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