In this thesis, the thermal properties of recycled PET plastic were analyzed using differential scanning calorimetry (DSC). Three samples of different origin were analyzed (a green Radenska bottle, a colorless Jar bottle, and a black Crown protein container), as well as a PET reference film for comparison. The measurements were performed with both larger and smaller sample masses, using cyclic and shock cooling methods. Particular attention was paid to the determination of the glass transition temperature (T$_g$), the crystallinity, and the influence of the sample mass on the shape of the DSC curves. The results show that samples from different sources have different degrees of crystallinity, that glass transitions are more pronounced with smaller sample masses, and that repeated heating allows a more reliable estimation of T$_g$. These results contribute to a better understanding of the properties of recycled PET and are useful for evaluating its potential for reuse.
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