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The pellets used in this study were provided by Dow Chemical Company. The polystyrene had a cylindrical shape with a mean diameter of 3.9 mm and density of 1045 kg/m3.The polyolefin had an elliptical shape with mean diameter of 4.6 mm and a density of 900 kg/m3. The mean diameter of the particles was measured by Scion Image software. The color of both materials was white, although the polyolefin was more opaque as opposed to the mostly transparent appearance of the polystyrene. In addition, the surface of the polystyrenewas hard and brittle while the polyolefin was soft (not rigid) and more
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