Analysis of recycling of high density polyethylene with additions of functional additives

Zaradi vse večjega kopičenja odpadnih polimernih materialov je postalo globalno vprašanje, kako jih reciklirati in pri tem ohraniti njihove pomembne mehanske lastnosti. Polietilen visoke gostote (HDPE) predstavlja velik del našega vsakdanjika. V magistrski nalogi smo raziskovali, ali se recikliranemu materialu HDPE po večkratnem injekcijskem brizganju in ponovnem recikliranju spremenijo mehanske lastnosti, predvsem natezna trdnost, in termične lastnosti, kot so temperatura taljenja, kristalizacije ter njuni entalpiji. Natezno trdnost smo preverjali z nateznim preizkusom. Termične lastnosti polimera, kot so temperatura taljenja, kristalizacije, njuni entalpiji in stopnja kristalizacije, smo analizirali z metodo diferenčne dinamične kalorimetrije (DSC). Pri tem smo ugotovili, da se natezna trdnost in termične lastnosti po desetih brizganjih pri izbranih parametrih ne spremenijo za več kot 10 % v primerjavi z osnovnim materialom.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\u27s 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