oa South African Journal of Chemistry - Influence of Different Waxes on the Physical Properties of Linear Low-density Polyethylene
The influence of three different waxes on the thermal and mechanical properties of linear low-density polyethylene (LLDPE) was investigated. the samples were prepared through melt blending in a Brabender mixer. the thermal properties of the samples were determined using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). the tensile and flow properties of all the samples were determined and compared. the polymer-wax miscibilities differed with the type of wax used, and with the amount of wax mixed into the polymer. These miscibilities, and accompanying morphologies, had a strong influence on the flow properties, thermal stabilities and tensile properties of the corresponding blends. H1 wax and M3 wax (which are both Fischer-Tropsch paraffin waxes produced by Sasol Wax) both reduce the apparent viscosity of LLDPE more than EnHance (a Fischer-Tropsch paraffin wax produced by Sasol Wax as a polyethylene processing lubricant). M3 wax had the strongest influence on the melt flow rates (MFI) of the blends, and it had the least influence on the tensile properties of LLDPE. It did, however, strongly reduce its thermal stability. H1 wax, on the other hand, had only a small influence on the thermal stability of LLDPE, but like EnHance it strongly increased the modulus.
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