Abstract
Non-isothermal crystallization and subsequent melting behaviour of iPP/sPP blends of various compositions were investigated by differential scanning calorimetry (DSC). Results revealed that sPP crystallizes at a slower rate than iPP. This effect is attenuated when the cooling rate is increased up to 20 °C/min and 25 °C/min. DSC scans showed that stability of primary crystallites of sPP and perfection of iPP crystallites were both increased by decreasing cooling rate. Effective activation energy ( Δ E X t ) of sPP, calculated using Friedman iso-conversional method, was found to be lower in iPP/sPP blend than in neat sPP whereas Δ E X t of iPP is not modified. Results were analysed through Avrami, Ozawa and Mo models. They both showed a decrease of crystal growth dimensionality for both iPP and sPP in iPP/sPP blends compared with neat iPP and sPP. The kinetic parameters U and K g were determined by the Hoffman–Lauritzen theory.
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