Phase structure and mechanical properties of PP/EPR/CaCO₃ nanocomposites: Effect of particle's size and treatment

Abstract

Calcium carbonate (CaCO 3 ) reinforced polypropylene/ ethylene propylene rubber (PP/EPR) copolymer composites for automotive use were developed by means of extrusion and injection molding process. Three kinds of CaCO 3 (stearic acid treated and untreated) nanoparticles and microparticles were used as fillers. The influence of stearic acid, particle size, and filler content on the state distribution and morphology were investigated by SEM and rheological measurements. Two different morphologies were observed: EPR and CaCO 3 dispersed in the PP matrix and a core shell structure, depending on the interactions between EPR and CaCO 3 . Toughening mechanisms and mechanical properties of the different systems were investigated. Significant improvement in tensile modulus is observed in all composites, depending on filler content. Elongation and notched impact strength were drastically decreased, especially for composites with nano CaCO 3 . Better impact properties were obtained with low content of treated particles, showing the importance of filler treatment.

Investigation of the microstructures, properties, and toughening mechanism of polypropylene/calcium carbonate toughening masterbatch composites

“…Good agreement was achieved between the experimental and theoretical results, which provided new ideas for material design. Elloumi and co‐workers investigated the effects of particle size and filler treatment of CaCO 3 on the properties of PP/EPR/CaCO 3 composites. They found that improvements in the notched impact strength could be obtained by nano‐CaCO 3 and that the treated particles had a tendency to form complicated structures with EPR, which could attain better impact strength.…”

A comparative study between epoxy/Titania micro‐ and nanoparticulate composites thermal and mechanical behavior by means of particle–matrix interphase considerations

“…Due to nanometer size of these particles, their physicochemical characteristics differ significantly from those of molecular and bulk materials. Nanoparticle reinforced polymers, synergistically combine the properties of both the host polymer matrix and the discrete nanoparticles [16][17][18]. Epoxy nanocomposites exhibit a wide range of positive characteristics, such as dielectric behaviors, thermal stability properties, good corrosion resistance, mechanical performance, and excellent tribological properties [19][20][21][22][23][24][25].…”

Friction and Mechanical Properties of Highly Filled Polybenzoxazine Composites: Nanosilica Particle Size and Surface Treatment

“…The variation of the coefficient of friction under different operating conditions is a very important issue. The coefficient of friction of nanocomposites can be affected by many factors such as mechanical behaviors, surface topography, particle size, particle surface treatment, and contents of filler …”

“…[38] The variation of the coefficient of friction under different operating conditions is a very important issue. The coefficient of friction of nanocomposites can be affected by many factors such as mechanical behaviors, surface topography, particle size, [39][40][41] particle surface treatment, [42,43] and contents of filler. [34] Therefore, effect of nanosilica contents, particle sizes, and surface treatments (polydimethylsiloxane (PDMS)-treated and dimethyldichlorosilane (DDS)-treated nanosilica particles) on mechanical, thermal, and physical properties of highly filled nanosilica-polybenzoxazine composites was examined in this research.…”