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Formation, structure and elasticity of model imperfect networks prepared by endlinking

  • M. Ilavský
  • K. Dušek
Permanent Networks
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 75)

Abstract

The extraction, viscoelastic, equilibrium mechanical and optical behaviour of polyurethane (prepared from poly (oxypropylene) triols-diisocyanate-monofunctional alcohol or monoisocyanate m the dry or dilute states) and epoxy (prepared from diamine-diepoxide and monoepoxide) networks has been analysed. In all cases, the theory of branching processes adequately describes the network formation and the weight fraction of sol W s. The networks are homogeneous and their viscoelastic behaviour has a model character. The equilibrium deformational behaviour of polyurethane networks indicates the presence of an entanglement contribution in the experimental modulus Gr. The Gr values can be adequately described by the theory of branching processes with the chemical, G c and the topological, Gent, contribution to both systems. The deformational behaviour of epoxy networks, however, can also be adequately described by the theory with the front factor A=1, without the entanglement contribution.

Key words

Formation of networks equilibrium modulus solfraction polyurethane networks epoxy networks concentration of elastically active network chains retardation spectrum 

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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1987

Authors and Affiliations

  • M. Ilavský
    • 1
  • K. Dušek
    • 1
  1. 1.Institute of Macromolecular ChemistryCzechoslovak Academy of SciencesPragueCzechoslovakia

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