Thermal properties and flame retardance of Al(OH)₃/polypropylene composites modified by polypropylene grafting with acrylic acid

The effect of polypropylene grafting with acrylic acid, PP‐ g ‐AA (FPP), on crystallization and melting behavior, thermal degradation, and limiting oxygen index of Al(OH) 3 /PP composites were investigated. The results indicated that crystallization temperature of PP shifted to high temperature with increasing content of Al(OH) 3 because of the interfacial heterogeneous nucleation of Al(OH) 3 and further increased by the addition of FPP and with increasing FPP content because of the improvement of the dispersion of Al(OH) 3 in PP matrix and the increase in the nucleating sites of Al(OH) 3 . With adding Al(OH) 3 and increasing the content of Al(OH) 3 , limiting oxygen index values of composites increased and further improved by adding FPP. This is attributed to the presence of an interfacial interaction between FPP and Al(OH) 3 .