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Aluminum trihydrate (ATH) of different sizes is added to polypropylene (PP) to prepare a composite which will have both good fire-retardant and mechanical properties. PP/ATH (nano or micro) composites are more fire-resistant and having appreciable mechanical properties as compared to virgin PP. Addition of maleic anhydride-functionalized polypropylene (MAPP) to the composite to increase the compatibility between PP and ATH (nano or micro). The need for developing the mechanical properties of flame-retardant composites is discussed in this paper. The influence of concentration of ATH (nano or micro) in PP/ATH (nano or micro)/MAPP composites is presented. The mechanical, thermal, morphological and flame-retardant properties were studied and discussed. The tensile modulus, hardness and flame-retardant properties increase, while elongation at break and tensile strength decreases with the increase in ATH (nano or micro) content. Graphical abstract

Aluminum trihydrate (ATH) of different sizes is added to polypropylene (PP) to prepare a composite which will have both good fire-retardant and mechanical properties. PP/ATH (nano or micro) composites are more fire-resistant and having appreciable mechanical properties as compared to virgin PP. Addition of maleic anhydride-functionalized polypropylene (MAPP) to the composite to increase the compatibility between PP and ATH (nano or micro). The need for developing the mechanical properties of flame-retardant composites is discussed in this paper. The influence of concentration of ATH (nano or micro) in PP/ATH (nano or micro)/MAPP composites is presented. The mechanical, thermal, morphological and flame-retardant properties were studied and discussed. The tensile modulus, hardness and flame-retardant properties increase, while elongation at break and tensile strength decreases with the increase in ATH (nano or micro) content.