Fig. 3
From: Quantifying the fragmentation of polypropylene upon exposure to accelerated weathering
A Melting curves of PP with (solid) and without stabilizer (dashed) for 0, 200, 350, 400 and 2000 h of weathering. Individual curves are shifted vertically for better comparability. B Tm in °C and C crystallinity in % as a function of exposure time from 0 to 2400 h for PP with stabilizer. D Tm and E crystallinity for PP without stabilizer. The induction phase is highlighted in yellow. Green marks the start of degradation while grey indicates on-going degradation with minor changes of Tm and crystallinity