Due to the growing accumulation of waste polymeric materials, it has become a global question how to recycle them while maintaining their important mechanical properties. High density polyethylene (HDPE) is a big part of our daily lives. In the master's thesis, we investigated whether the recycled HDPE material changes its mechanical properties after repeated injection molding and recycling, especially tensile strength and thermal properties, such as melting and crystallization temperature and their enthalpies. The tensile strength was checked by a tensile test. The thermal properties of the polymer, such as melting and crystallization temperature, enthalpies and crystallization rate, were analyzed by differential dynamic calorimetry (DSC) method. We found that the tensile strength and thermal properties after ten injections at the selected parameters do not change by more than 10% compared to the primary material.
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