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Abstract
This work investigates the fire retardancy, the thermal and thermomechanical properties of PP/PC blends using commercially available grafted polyolefins with functional groups as compatibilizing agent. In the first part, the effect of compatibilizer on the morphology has been correlated with the thermomechanical properties. The blends, containing 75% of PP and 25% of PC or 22% PC plus 3% compatibilizer have been prepared during the melt processing in a mixer. The compatibilizers were grafted maleic anhydride polypropylene (PP‐g‐MA) and a terpolymer ethylene/acrylic ester/maleic anhydride (EBuAMA). The thermal stability was improved up to 400°C when using compatibilizer in comparison with PP/PC blend. The thermomechanical properties were improved for PP/PC/PP‐g‐MA blend. It was found that the addition of compatibilizer slightly decrease the particle size of the minor PC phase. The crystallization temperature of PP in PP/PC/PP‐g‐MA increases which may explained the improvement of the properties of the blend in comparison with PP/PC/EBuAMA. In a second part, fire retardant formulation are developed. The fire retardant properties of the blend are slowly affected by the presence of a compatibilizer.