Abstract
The rheological properties of polypropene containing various amounts of woodflour, of polypropene elastified with 1,4-poly-cis-isoprene and of the ternary composite material based on polypropene, elastified polypropene and wood-flour were studied. The flow curves (viscosity curves) of the melts were obtained by means of a capillary viscosimeter, and the melt flow index, the consistency index and the melt flow rate through the capillary were determined from these curves. A pseudo-plastic nature of the flow was established, the compositions containing 7 to 15 wt.-% of elastomer showing the best flowability. The activation energy of viscous flow was calculated from the shear viscosity using the Frenkel-Eyring equation. The elastified polypropene was characterized by an enhanced impact strength, timber outlook and higher outdoor durability, as compared to elastomer-free, wood-flour-filled polypropene
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