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Keywords:

  • Copolymers, random;
  • Elastomers;
  • Thermoresponsive materials
Thumbnail image of graphical abstract

Syndiotactic propylene–ethylene copolymers show entropic or enthalpic elasticity depending on ethylene concentration (see Figure). Enthalpic elasticity is due to a reversible transition between transplanar and helical polymorphic forms during stretching, and allows maintenance of elasticity even for highly crystalline materials.