Abstract
Polypropylene (PP) and high density polyethylene (HDPE) were successfully fabricated using injection molding machine, by the addition of exfoliated graphite nanoplatelets composites reinforced with 2wt.t% of nano-magnesia. The nanoindentation properties and microstructure of the composites were investigated, in the current study. The XRD patterns of both composites showed the peaks of xGnP and n-MgO, where their intensity became stronger with increasing the concentration of xGnP added into both polymers. In addition, the SEM micrographs revealed a good dispersion of fillers within the matrix. The nanoindentation properties of both nanocomposites revealed better properties with compared to the virgin polymers. The PP nanocomposites showed an improvement of hardness up to 22 % and 118% with the compositions of 1xGnP/2n-MgO and 5xGnP/2n-MgO respectively. In addition, HDPE/1xGnP/2n-MgO and HDPE/5xGnP/2n-MgO represented a dramatic improvement of hardness up to 146% and 341% respectively with compared to virgin polymer. In addition, the enhancements in reduced modulus of PP and HDPE were proportional to the xGNP loading.
Highlights
Several advantages of thermoplastic composites over classical thermoset-based matrices composites made them a main point of interest
The enhancements in reduced modulus of PP and high density polyethylene (HDPE) were proportional to the xGNP loading
A commonly utilized technique in the determination of composites characterization is the Wide Angle X-ray Diffraction (WAXD), which is known to be used in studying intercalation or exfoliation structures
Summary
Several advantages of thermoplastic composites over classical thermoset-based matrices composites made them a main point of interest. Magnesium oxides (MgOs) Nanoparticles are vastly adopted metal oxides, which could be highly tempting potential filler They are known to be obtained from various low-cost raw materials including magnesium salts, bearing minerals, and brines; they are characterized with outstanding properties like their remarkable thermodynamic stability, noticeably elevated hardness, melting point, strength, and modulus [20]. The method of nanoindentation depends on a local deformation that presented on a materials surface by utilizing an indenter with specific geometry under a given load. In this method, a combination of both the viscoelastic and viscoplastic properties which relies on the total indentation depth.
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