Influence of nanosized CaCO3 content in tailoring the structure, the morphology and the thermal and mechanical properties of iPP/PA66/PP-g-MA alloy

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Nanocomposites of Polypropylene/Polyamide 66 (iPP/PA66) with a weight ratio of (70/30) filled with stearic acid-treated nanosized CaCO3 were melt compounded in the presence of a fixed amount of grafted polypropylene maleic anhydride (PP-g-MA) in a Brabender mixer. The purpose of this research is to obtain nanocomposites with high-performance structural, morphological, and thermomechanical properties. The obtained properties are discussed in light of the content of nano-CaCO3 and of the induced interfacial bonding properties generated by the insertion of the compatibil- izer. The results confirmed that, according to the FTIR spectroscopy ana- lysis, the existence, on one hand of possible interactions between PP-g-MA and PA66 and, on the other hand, between stearic acid and PA66. XRD results show that nanosized CaCO3 particles play the role of nucleating agents in the matrix and thus increasing the crystallinity of the blend. SEM results revealed that the treated nanosized CaCO3 was more homoge- neously dispersed in the (iPP/PA66), and a refinement of the morphology and better dispersion of the filler were detected after the addition of PP-g- MA. From the mechanical point of view; the incorporation of CaCO3 increased appreciably the tensile strength at break and the tensile modu- lus of (iPP/PA66) blend.