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The Role of Intra- and Intermolecular Cohesion in Fracture Initiation of High Polymers

  • H. H. Kausch
  • J. Becht

Abstract

The ultimate behavior of solid high polymers depends critically on the elastic energy stored within molecular chains. In this paper, the mechanism of the axial loading of chains through secondary bonds is studied in detail. For polyethylene and 6-polyamide, the maximum stresses which can be exerted by a defect-free crystallite in static equilibrium onto a chain are calculated. They are 0.75 × 1011 dynes/cm2 (PE) and 2.24 × 1011 dynes/cm2 (6-PA), respectively. The thermal excitation of stressed chains causes dislocations to migrate into the crystallite. The energy of dislocations and that of their activation are calculated as a function of molecular stresses. The effect of dislocation motion on chain breakage and macroscopic strength is discussed.

Keywords

Fracture Initiation Chain Scission Atom Group Crystal Boundary Chain Breakage 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Kausch, H. H., and Becht, J., Kolloid-Z. u. Z. Polymere, 250, 1048 (1972).CrossRefGoogle Scholar
  2. 2.
    DeVries, K. L., private communication.Google Scholar
  3. 3.
    Becht, J., Dissertation, Technische Hochschule, Darmstadt, 1970.Google Scholar
  4. 4.
    Lindenmeyer, P., Mechanical Behavior of Materials,Soc. Mat. Sci., Japan (1972), Special Vol., p 74.Google Scholar
  5. 5.
    Baur, H., and Wunderlich, B., Fortschr. d. Hochpolymeren Forschung, 7, 388 (1970).Google Scholar
  6. 6.
    Fischer, E. W., and Hinrichsen, G., Kolloid-Z. u. Z. Polymere, 213, 28 (1966).CrossRefGoogle Scholar
  7. 7.
    Kausch, H. H., and Langbein, D., J. Polymer Sci., Polymer Physics Edition, Vol 11 (1973).Google Scholar
  8. 8.
    Fowler, R., and Guggenheim, E. A., Statistical Thermodynamics, University Press, Cambridge (1952), p 495.Google Scholar
  9. 9.
    Kausch, H. H., and Becht, J., Rheol. Acta, 9, 137 (1970).CrossRefGoogle Scholar
  10. 10.
    Tomashevskii, E. E., Soviet Physics — Solid State, 12, 2588 (1971).Google Scholar

Copyright information

© Springer Science+Business Media New York 1973

Authors and Affiliations

  • H. H. Kausch
    • 1
  • J. Becht
    • 1
  1. 1.Battelle-Institut e. V.Frankfurt(Main)Germany

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