A method for preparation of blends of isotactic polypropylene (PP) and thermoplastic elastomer, block-copoly(styrene/ethylene-alt-propylene) with a constant content (10 wt.%) of elastomer varying in mean aggregate size (1–5 μm) was developed. Samples of the obtained blends were characterized by the methods of dynamic mechanical thermal analysis (DMTA), impact measurements and electron microscopy (SEM). A considerable increase of storage modulus and loss modulus with an increase in dispersion degree of elastomer in PP and the existence of remarkable interaction between olefin block of thermoplastic elastomer and polypropylene was observed. Interactions between PS block and PP are weak and can be observed by the DMTA method only in the case of large elastomer aggregates present in the composition. Moreover, electron microscopy and impact measurements showed the existence of an optimum size of the elastomer aggregate (2–3 μm) with respect to the toughening effect.
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