engleski

Structure and mechanical properties of PP/talc/SEBS composites

Impact resistance and yield stress of particulate filled polymers are assumed to decrease with increasing filler content. The addition of an elastomer improves the fracture, and especially the impact resistance of multicomponent polymeric composites. The purpose of our research work was to determine the relationships between structure and mechanical properties of ternary polypropylene (PP) composites with talc filler and poly-(styrene-b-ethylene-co-butylene-b-styrene) block copolymer (SEBS) and SEBS grafted with maleic anhydride (SEBS-g-MA) as well as corresponding binary blends and composites. The blends and composites were characterised by scanning electron microscopy, optical microscopy, wide angle X-ray difraction, tensile measurements and measurements of notched impact strength. By the analysis of phase structure and morphology of PP blends and composites the influence of talc and elastomers (SEBS and SEBS-g-MA) on mechanical properties were determined. The observed increase of differencies in notched impact strength (and tensile properties) with incorporation of talc filler and different elastomers (SEBS and SEBS-g-MA) could be explained by the change of supermolecular structure (phase morphology) of PP matrix as well as by encapsulation and orientation of talc filler.

blends; composites; isotactic polypropylene; styrenic block copolymers; talc

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