Heat treatment of isotactic polypropylene: the effect of free quenching from the melt state

Studying the effect of quenching from the melt state on the structure and impact resistance of Isotactic polypropylene (iPP) was the major aim of this work. Various tests were applied to confirm changes that occur to iPP, namely impact tests, WAXD, FTIR, and the density. The quenching from the melt state to different temperatures decreased the values of Izod impact strength for all the quenching temperatures. The FTIR result showed a decrease in the crystallinity of the polymer at the free quenching temperature of 20?°C. The X-ray diffraction study revealed that the α structure dominates the main morphology of iPP.