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Oriented Gamma Phase in Isotactic Polypropylene Homopolymer.

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New processing conditions enable high yields of the polypropylene γ-phase in Ziegler-Natta isotactic polypropylene (ZN-iPPs). Moderate pressure and shear flow create oriented structures with significant γ-phase content.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Crystallography

Background:

  • The γ-phase in isotactic polypropylene (iPP) is known but difficult to induce.
  • Conventional methods require high pressures (≥2000 bar) or specific catalysts like metallocene (M) iPPs.

Purpose of the Study:

  • To investigate inducing high γ-phase content in ZN-iPPs under novel processing conditions.
  • To characterize the resulting morphology and phase structure.

Main Methods:

  • Crystallization of ZN-iPPs under moderate pressure (≥900 bar) combined with strong shear flow.
  • Morphological analysis of the resulting oriented specimens.

Main Results:

  • Achieved high contents of the γ-phase in ZN-iPPs.
  • Developed oriented morphology characterized as a shish-kebab structure.
  • Observed γ-lamellae templated on α-lamellae and shish backbone.

Conclusions:

  • Moderate pressure and shear flow are effective for inducing γ-phase in ZN-iPPs.
  • This method offers an alternative to high-pressure or specialized catalyst systems.
  • The shish-kebab morphology facilitates dense γ-lamellae formation.