Morphology of high-impact polypropylene


Responsible persons:


High-impact polypropylene is a type of heterophase polymers, thus means that it consists of two immiscible phases:

  • semi crystalline iPP (isotactic polypropylene)
  • amorphous EPR (ethylene-propylene rubber)
  • crystalline PE inclusions (polyethylene)

Its morphology develops from the first interaction with the catalyst in the reactor to the final form after down-stream processes including extrusion. Our goal is to investigate hiPP morphology evolution along two-stage polymerization and two extrusions and determine the factors which affect the hiPP morphology during its evolution, such as:

  • catalyst type,
  • EPR content and constitution,
  • catalyst poisons,
  • conditions in the reactor and extruder.

The mechanical properties of hiPP are closely related to its morphology. Thus, by the knowledge of hiPP morphology and control of its evolution it would be possible to manufacture the hiPP with the desired mechanical properties.



Smolná K., Gregor T., Kosek J.: Morphological analysis of high-impact polypropylene using X-ray microCT and AFM, European Polymer Journal, 2013, 43(12): 3966-3976.


Juraj Kosek
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+420 220 443 296

University of Chemistry and Technology Prague
Department of Chemical Engineering
Technicka 5
166 28 Prague 6
Czech Republic

University of West Bohemia
New Technologies Research Centre (NTC)
Univerzitní 8
306 14 Pilsen
Czech Republic