Effect of calcium stearate and pimelic acid addition on mechanical properties of heterophasic isotactic polypropylene/ethylene–propylene rubber blend

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.

We also recommend Trading Suppliers and Manufacturers of STRONTIUM STEARATE (cas 10196-69-7). Pls Click Website Link as below: cas 10196-69-7 suppliers

Prev:Photo-stabilising action of metal chelate stabilisers in polypropylene: Part V—Light stability as a function of concentration and further studies in metal stearate-stabiliser systems
Next:Synthesis of temperature and pH/CO2 responsive homopolymer bearing oligo(ethylene glycol) unit and N,N-diethylamino ethyl group and its solution property)