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Deformation of semicrystalline and molten polyethylene the role of entanglements

  • E. Paul
  • B. Heise
  • W. Schrodi
  • H. G. Kilian
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 85)

Abstract

Pressure-strain curves measured for high- and low-density polyethylene under rapid and different strain rates at different temperatures are described with the aid of the adequate van der Waals network equation of state. The homogeneous melt behaves like a quasi-permanent network with the same entanglement concentration as deduced from the plateau-modulus. Entanglements can be identified by large fluctuations approximating the ones of chain ends. It is demonstrated that entanglements cannot be annihilated during crystallization. Entanglements are squeezed out of crystals so that their configuration is related to the primary colloid-structure. Pressure-strain curves of semi-crystallized samples are described by using the same parameters as in simple extension. Deformation mechanism in semicrystalline polymers are deformation-mode invariant. Entanglements should be “condensated” during the stretch so that the effective chain-length in the crystal-cluster network exceeds at least the one observed in the melt.

Key words

Polyethylene large deformation entanglement-network van der Waals-network model 

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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1991

Authors and Affiliations

  • E. Paul
    • 1
  • B. Heise
    • 1
  • W. Schrodi
    • 1
  • H. G. Kilian
    • 1
  1. 1.Abteilung für Experimentelle PhysikUniversität UlmUlmFRG

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