The aim of the thesis was to determine thermal and time-dependent mechanical properties of recycled polypropylene and observing the influence of additive on these properties. Polypropylene was mechanically recycled with extrusion, on every stage sample was taken for analysis. Recycled polypropylene was analysed experimentally using differential scanning calorimetry and creep test. With increased cycles of mechanical recycling, chain scission is observed, crystallinity and lifetime of material are increasing. With addition of additive degradation of polypropylene is reduced, spliting of chains slows down, crystallinity and lifetime of material decrease.
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