Molecular Bond Rupture Associated with Inelastic Deformation of Elastomers

  • R. Brown
  • K. L. DeVries
  • M. L. Williams


Unstrained rubbers cooled far below their glass transition temperature are generally very brittle. The ductility can, however, be greatly increased by prestraining (~100%) the rubber before reducing the temperature as suggested by Andrews and Reed. Results on natural rubber and Hycar 1043 rubber are reported, showing the effects of prestrain, temperature and strain rate on low temperature ductility and primary molecular bond rupture. Molecular bond rupture was measured by electron paramagnetic resonance (EPR) techniques. X-ray diffraction in rubbers indicates that prestraining and cooling results in orientated crystallization. It is suggested that this, in effect, produces a semi-crystalline polymer with a resulting increase in ductility and rather general bond rupture (throughout the loaded sample volume) during deformation leading to fracture.


Electron Paramagnetic Resonance Electron Paramagnetic Resonance Spectrum Natural Rubber Electron Paramagnetic Resonance Signal Inelastic Deformation 
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  1. 1.
    E. H. Andrews and P. E. Reed, Polymer Letters 5, 317 (1967).CrossRefGoogle Scholar
  2. 2.
    Personal Communication.Google Scholar
  3. 3.
    D. K. Roylance, K. L. DeVries and M. L. Williams, Fracture 1969 Chapman & Hall, London, 1969, p. 551.Google Scholar
  4. R. R. Despain, K. L. DeVries, R. D. Luntz and M. L. Williams, “Microscopic Degradation in Teeth,” To be published in J. Dental Res. (1970).Google Scholar
  5. 5.
    K. L. DeVries, E. R. Simonson and M. L. Williams, J. Basic Engr. 91, 587 (1969).Google Scholar
  6. S. N. Zhurkov, Int. J. Frac. Mech. 1, 311 (1965).Google Scholar
  7. 7.
    S. N. Zhurkov, A. Y. Savostin, E. E. Tomashevskii, Dokl. Akad. Navk. SSSR 195, 707 (1969).Google Scholar
  8. 8.
    D. Campbell and A. Peterlin, J. Poly. Sci. B 6, 481 (1968).Google Scholar
  9. 9.
    H. H. Kausch and J. Becht, Rheologica Acta 9, 137 (1970).Google Scholar
  10. 10.
    M. Baird and J. Bersohn, Electron Paramagnetic Resonance W. A. Benjamin, Inc., New York (1966).Google Scholar
  11. 11.
    K. L. DeVries, D. K. Roylance and M. L. Williams, J. Poly. Sci. A-1, 8, 237 (1970).Google Scholar
  12. 12.
    F. A. McClintock and A. S. Argon, Mech. Behavior of Matls. Addison-Wesley, Inc., Reading, Mass. (1966).Google Scholar
  13. 13.
    L. R. G. Treloar, The Physics of Rubber Elasticity Oxford Press (1958).Google Scholar
  14. 14.
    R. Dickie and T. Smith, J. Poly. Sci. 7, 635 (1969).Google Scholar
  15. 15.
    E. M. Bartenev and Y. S. Zuyev, Strength and Failure of Viscoelastic Materials Pergamon Press, New York (1969).Google Scholar
  16. 16.
    A. F. Joffe, Zhrfkho Chast’fizicheskay 56, No. 5–6, 489 (1924).Google Scholar
  17. 17.
    R. F. Boyer and R. S. Spencer, Advances in Colloid Science II Interscience Inc., New York (1946).Google Scholar
  18. 18.
    R. E. Morris, R. R. James and T. A. Werkenthin, Ind. Eng. Chem. 35, 864 (1943).Google Scholar
  19. 19.
    A. M. Borders and R. D. June, Ind. Eng. Chem. 38, 1066 (1949).Google Scholar
  20. 20.
    J. M. Goppel, Appt. Sci. Res. Al, 3 (1949).Google Scholar
  21. 21.
    L. A. Wood, Advances in Colloid Science II, Interscience Inc., New York (1946).Google Scholar
  22. 22.
    E. H. Andrews and A. N. Gent, The Chemistry and Physics of Rubber-Like Substances Garden City Press, Ltd., Letchworth, England 225 (1963).Google Scholar
  23. 23.
    L. E. Alexander, X-Ray Diffraction Methods in Polymer Science Wiley & Sons, Inc., New York (1969).Google Scholar
  24. 24.
    M. Mooney and W. E. Wolstenholme, Ind. Eng. Chem. 44, 59 (1953).Google Scholar
  25. 25.
    G. E. King, Ind. Eng. Chem. 35, 9 (1943).Google Scholar
  26. 26.
    E. E. Beu, W. B. Reynolds, C. F. Fryling and H. L. McMurray, J. Poly. Sci. 3, 465 (1948).Google Scholar
  27. 27.
    J. Becht, K. L. DeVries and H. H. Kausch, “On Some Aspects of Strength of Fibers,” To be published in the European J. Poly. Sci. (1970).Google Scholar

Copyright information

© Springer Science+Business Media New York 1971

Authors and Affiliations

  • R. Brown
    • 1
  • K. L. DeVries
    • 1
  • M. L. Williams
    • 1
  1. 1.University of UtahSalt Lake CityUSA

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