The influences of combined elastomers on impact properties and morphology of polypropylene (PP)/elastomer/CaCO
3 ternary composites were investigated. When polystyrene-
block-poly(ethylene-butene)-
block-polystyrene triblock copolymer (SEBS) and poly(ethylene-octene) copolymer (EOR) were used as elastomer, the core-shell elastomer particles with EOR-core and SEBS-shell were formed. The elastomer particles and CaCO
3 particles were separately dispersed in PP matrix. When carboxylated SEBS (C-SEBS) combined with EOR were used as elastomer, the C-SEBS particles were dispersed in EOR particles. CaCO
3 particles were dispersed in PP matrix, whereas a part of the CaCO
3 particles were dispersed in C-SEBS/EOR combined particles. Impact strength increased with the amount of incorporated CaCO
3 particles. The effect of elastomer on the impact strength was SEBS ≥ SEBS/EOR > EOR = C-SEBS/EOR > C-SEBS. The morphology formed by elastomer and CaCO
3 particles strongly affected the impact properties of the ternary composites.
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