Polyphenylsiloxane microspheres(PPSQ)/random copolymer polypropylene(PPR)composites were prepared by injection molding using PPR resin as matrix and PPSQ as modifier.The effects of PPSQ microspheres on chemical composition,mechanical properties,heat resistance,melting behavior and microstructure of PPSQ/PPR composites were investigated by Fourier transform infrared spectroscopy(FTIR),differential scanning calorimetry(DSC)and scanning electron microscope(SEM).The results show that comparing with pure PPR,the bending modulus of the composite increases by 14.08％,the impact strength decreases by 0.80％,the thermal deformation temperature increases by 7.80 ℃ and the crystallinity increases by 8.70％,when the content of PPSQ modifier is 6％.PPSQ microspheres can effectively improve the heat resistance and rigidity of PPR without basically affecting the impact performance of PPR.
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