Study of Morphological, rheological and mechanical properties of PP/HDPE blend compatibilized with poly (propylene-g-maleic anhydrid e)

In this study, the morphological, rheological and mechanical properties of the PP/HDPE blend compatibilized with poly (propylene-g-maleic anhydride) were studied. The blends were obtained using a counter current twin screw extruder. The blend composition ranged from 10 to 50 wt% of dispersed phase (HDPE) and Concentrations of compatibilizer (MAPP) ranging from 0 to 20 wt% with respect to the dispersed phase (HDPE) were used for the PP/HDPE (80/20) blend. The results of morphological studies show a sea-island structure in the composition to 50 wt% HDPE content, which indicates that HDPE forms a dispersed phase and PP forms a continuous phase in these composition region. Addition of the MAPP compatibilizer decreases the size of these sea-islands. Rheological studies in steady state which were done at three temperatures of 190, 210 and 230°C and shear rate of 0.01- 100 (sec-1), show that addition of the MAPP compatibilizer increases the melt viscosity of the lends. Rheological studies in dynamic state which were done at a temperature of 190°C and frequency of 0.1-100 (sec-1), show that addition of the MAPP compatibilizer increases the complex viscosity, storage and loss modulus of the blends. Mechanical studies show that with increasing of the HDPE concentration the tensile and impact strength first increase, and then decrease. The elongation at break decreases with increasing of the HDPE concentration. Addition of the MAPP compatibilizer increases the elongation at break, tensile and impact strength.

کلیدواژه ها:

Polymer blends ، Rheology ، Morphology ، Compatibilizer