Abstract: Polypropylene (PP) was modified by intumescent flame retardant (IFR) and organic montmorillonite (OMMT).The flame retardancy,thermal stability,mechanical properties and morphology of PP/IFR/OMMT composites were analyzed by UL-94 vertical flame test,limiting oxygen index (LOI),thermogravimetric analysis (TGA) and tensile testing.The effect of IFR and OMMT on the flame retardancy,mechanical property and thermal stability of PP was investigated.And the ingredient and morphological features of samples were analyzed by Infrared Spectrometer and scanning electron microscopy (SEM).The results showed that the thermal stability and flammability of PP/IFR were greatly promoted by the addition of OMMT,the LOI value of PP/IFR/OMMT increased to 23% from 18% when the additive of OMMT was 2%,UL-94 rates increased to V-0 from NR,and no molten dropped.Meanwhile,the mechanical property was well,the tensile strength and elongation at break reached to 34.46MPa,107.19% respectively.
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