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Keywords:

  • homogeneous catalysis;
  • mechanical properties;
  • mesophases;
  • metallocenes;
  • polymers
Thumbnail image of graphical abstract

Crystals in polymers: The γ form of isotactic polypropylene shows an unexpected better ductility than the mesophase because of the occurrence of a stress-induced transition from the γ form to the mesophase. This provides a mechanism of conversion of mechanical energy into latent heat of fusion that induces local melting of the crystals followed by recrystallization at high deformation in the mesophase (see picture).