Abstract: Styrene-butadiene powder (SBR) was introduced into polypropylene (PP) as a toughener, the mechanical property of PP/SBR was studied, and the influence of a compatilizer on mechanical properties of the blend was investigated. It was found that the impact strength of the PP/PSBR/compatibilizer system was 5 times that of neat PP, however, the tensile strength, stiffness, and heat distortion temperature were decreased. Observed by TEM, the compatibilizer made the PSBR finer dispersed in PP matrix, which was considered a reason for the effective toughening.

Key words: styrene-butadiene rubber, polypropylene, compatilizer, mechanical property