Advertisement

Trapped entanglements in polymer networks and their influence on the stress-strain behavior up to large extensions

  • M. Klüppel
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 90)

Abstract

The paper demonstrates how a characterization of unfilled, amorphous rubber networks can be evaluated from uniaxial stress-strain measurement data. A network model is proposed that includes finite chain extensibility, topological constraints, and a trapped entanglement constribution to the reduced stress, which does not vanish in the infinite strain limit. Beside their influence on topological constraints, trapped entanglements are assumed to act like additional junctions, which also reduce the limiting extensibility of the network. In this framework a relation between the crosslink contribution and the topological constraint contribution to the reduced stress is derived, which allows the determination of the trapping factor from experimental stress-strain measurement data. The experimental results found for NR-networks cured with thiuram (TMTD) and peroxide (DCP), respectively, confirm the proposed model. It becomes obvious that the low topological constraint contribution found for the DCP-cured networks is related to a lower trapping rate, which results from main-chain scission during the curing procedure.

Key words

Rubber elasticity trapped entanglements finite extensibility topological constraints network defects 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Heinrich G, Straube E, Helmis G (1988) Adv Polym Sci 85:33CrossRefGoogle Scholar
  2. 2.
    Langley NR (1968) Macromolecules 1:348CrossRefGoogle Scholar
  3. 3.
    Dossin LM, Graessley WW (1979) Macromolecules 12:123CrossRefGoogle Scholar
  4. 4.
    Langley NR, Polmanteer KE (1974) J Polym Sci Polym Phys 12:1023CrossRefGoogle Scholar
  5. 5.
    Oppermann W, Rennar N (1987) Prog Colloid Polym Sci 75:49CrossRefGoogle Scholar
  6. 6.
    Gaylord RJ (1983) Polym Bull 9:186CrossRefGoogle Scholar
  7. 7.
    Marrucci G (1981) Macromolecules 14:434CrossRefGoogle Scholar
  8. 8.
    Kästner S (1981) Colloid Polym Sci 259:499CrossRefGoogle Scholar
  9. 9.
    Treloar LRG (1975) The Physics of Rubber Elasticity, 3rd Ed, Clarendon Press, OxfordGoogle Scholar
  10. 10.
    Edwards SF, Vilgis TA (1986) Polymer 27:483CrossRefGoogle Scholar
  11. 11.
    Bandrup J, Immergut EH (Eds) (1975) Polymer Handbook, 2nd Ed, Wiley Interscience, New YorkGoogle Scholar

Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1992

Authors and Affiliations

  • M. Klüppel
    • 1
  1. 1.Deutsches Institut für Kautschuktechnologie e.V.Hannover 81FRG

Personalised recommendations