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Differential scanning calorimetry (DSC) curves of the PP, PP/HNTs, PP/carvacrol and PP/(HNTs-carvacrol) films: (a) first heating and (b) second heating steps (at a rate of 10 °C·min−1). PP/carvacrol films exhibit solid–solid transition slightly above 80 °C (emphasized in the inset) and appear to have less ordered crystalline structure than the other films. The curves are offset along the Y-axis for clarity.
