Abstract
Polymers and polymeric composite materials have steadily reflected their importance in our daily life. In the present work various thermal properties of Polypropylene (PP)/Polystyrene (PS) blend of compositions (100/0, 80.8/19.2, 72.4/27.6, 61.5/38.5, 51/49, 40.7/59.3 and 0/100 wt/wt%) have been studied using Differential Scanning Calorimetry. The obtained results from DSC analysis showed no variation in the glass transition temperature Tg of PS indicating the immiscibility of the blend system. The melting temperature (Tm) of PP in the blend decreases with increasing PS concentration and the maximum depression (∼4.7 °C) in Tm is found for blend with composition 40.7/59.3. The enthalpy of melting (ΔHm) and the % crystallinity of the blend system also decrease almost linearly with increasing PS concentration. The crystallization temperature (Tc) of PP in the blend system is found to ∼121 °C but for virgin PP the crystallization temperature is 140.7 °C. This depression in Tc is due to presence of droplet like domain of PS in the molten state. In this study also the variation of specific heat with temperature of the blend compositions have been measured.
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