Abstract
AbstractBlends of isotactic polypropylene (iPP) and high density polyethylene (HDPE), with and without compatibilizers and with different organoclay amounts (1%, 3%, and 5%), were systematically investigated to assess the effect of the additives on the crystallinity of the blends, as well as the correlation between the microhardness,Hand the Young’s modulusE. The compatibilizers used were: maleic anhydride grafted styrene ethylene butadiene styrene (SEBS-g-MAH), maleic anhydride grafted polyethylene (PE-g-MAH), maleic anhydride grafted polypropylene (PP-g-MAH), ethylene propylene diene monomer (EPDM), and maleic anhydride grafted EPDM (EPDM-g-MAH). The thermal properties and crystallization behavior were determined by differential scanning calorimetry (DSC) and wide angle X-ray scattering (WAXS). Macro- and micromechanical properties were also investigated. The results obtained showed that the addition of clay slightly increases the crystallinityαWAXSof the blends. However, the hardnessHdecreases enormously only by adding 1 wt% of clay. With higher clay amounts,Hincreases again. The relationship between the Young’s modulusEand the hardnessHfor all the studied blends was found to be somewhat higher than the one obtained for polyethylene (PE) samples with different morphologies.
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