Study the Effect of CaCO₃Nanoparticles on the Mechanical Properties of Virgin and Waste Polypropylene

Abstract

This paper study the effect of the calcium carbonate (CaCO3) nanoparticleson mechanical and physical properties of virgin and waste polypropylene (pp.). 3, 5, 7 and 10 (wt. %) of CaCO3nanoparticles are mixed with each of virgin and waste pp.These mixture are blended in co-rotating twin screw extruder at 190 °Cand different screw speed (25 and 50 rpm). Different mechanical and physical technique are used to evaluate the characteristics of polymer nanocomposites ex: Tensile strength , elastic modulus , impact strength , hardness and density. The results of virgin pp./(CaCO3) showed that The tensile strength decreasing with nano(CaCO3) concentration for virgin pp. , while for waste increasing at 5% and then decreasing gradually. The impact strength increasing with nanoCaCO3concentration increasing. The hardness and density increasing with the increasing of the nanoCaCO3concentration for two type of pp.Nearly all the mechanical properties were found to increase with the processing speed of 25 rpm. In this studies, it was seen that the highest processing speed of 50 rpm does not give the material performance enhancements due to higher shear intensity which causes defect points in the structure. Also the time is smaller at high screw speeds, so there is not enough time for good dispersion to occur.

Light‐weight and high‐strength PP/CaCO3 composites by die drawing: Effect of drawing ratios

“…[3][4][5] However, particle filled PP composites would lose the advantage of light weight when the percentage of inorganic fillers was high. [6] The mechanical properties of inorganic particle filled PP composites were still lower than those of engineering plastics, such as polyamide (PA), polycarbonate (PC). [7,8] Researchers discovered that mechanical properties would be lost due to the excessive particles loading, particularly tensile and flexural strength.…”

Effect of Calcium Carbonate as Filler on the Physicomechanical Properties of Polypropylene Random

“…The density of PPR increased because of the high density of CaCO3.when the percentage increases the density increases. Najim et al [31] observed a gradual rise in the density of PP filled with CaCO3. This increase is primarily attributed to the higher density of CaCO3 nanoparticles, which stands at 2.71 g/cm 3 .…”

“…Notably, the overall MFR of polypropylene filled with calcium carbonate CaCO3 is higher than that of other composite materials, suggesting that CaCO3 has the capability to enhance the plasticity and process ability of the polymer. Najim et al [31] investigated the density behavior, it's inconsistently increased in the case of PP filled with CaCO3. This rise in density can be primarily linked to the notably higher density of CaCO3 nanoparticles, which is at 2.71 g/cm³.…”

Preparation and Characterization of PMMA Magnetic Nanocomposite

“…Eachpolymer could present differentl critical pressure coefficientl toshearviscosityj,and then shows different geometrica dependences ofshear viscosity.The pressure sensitivity is mainly duel to the decrease of the action of distancebetween moleculesl. For the capillary flow of polymer melts in practicalprocessing, theshear ratecould be high companied by a high pressure, especiallyin micro-extrusion and micro-injection [8,14,17]. The magnetization measurements provide strong evidence of surfaces effects to magnetization, which explains the non-saturations of magnetizations at high fields.There magnetizationd versuse applied field behaviors ofas thethree ferrite systemsas showa similar jumps in the initial part of the magnetization curve in all the cases which implies the existence off a core-shell likes morphology of the particles over larges temperaturea ranged and its dominance overs thes interparticled interaction effects between the particles.…”