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Mechanical and rheological properties of multicomponent polypropylene blends
Author(s) -
Pukánszky Béla,
Tüdõs Ferenc,
Kelen Tibor
Publication year - 1986
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.750070208
Subject(s) - materials science , composite material , polypropylene , elastomer , ultimate tensile strength , rheology , homogenization (climate) , composite number , dispersion (optics) , precipitated silica , natural rubber , biodiversity , ecology , physics , optics , biology
Polypropylene (PP) compositions containing CaCO 3 filler, EPDM (ethylene‐propylene‐ethylidenenorbornene) elastomer, and a non‐reactive surfactant were investigated in the mixing chamber of a plastograph. Rheological properties were determined from the registered torque ( M ) vs. time and temperature ( T ) vs. time curves, while tensile characteristics of the blends were measured on compression molded plates. The homogenization process can be followed with the aid of 1 n M vs. 1/ T diagrams. In the first few minutes of the mixing, beside homogenization, a significant breaking down of the elastomer takes place, and the size of the particles attains an equilibrium value. Dispersion time increases with increasing amount of EPDM and surface active‐agent. Morphological investigations indicate the presence of a continuous PP phase containing dispersed CaCO 3 and elastomer particles. The rheological and tensile characteristics are seemingly determined by the total amount of additives, which imply that the elastomer and the filler has the same effect on the properties of the composite. Separation of the effects proved, however, that the effect of the two components are dissimilar, the filler exerts a larger influence on the investigated properties.