Chemical and Physical Aspects of the Three Stages in Forming Polymer Networks

  • M. Gordon
  • T. C. Ward
  • R. S. Whitney

Summary

Features common to all kinds of network-forming processes are discussed in chronological order along the three stages into which such processes can generally be divided: i) processes without diffusion control, ii) with selective diffusion control of some component steps and iii) with diffusion control of all steps. Apart from the need to study processes in order to understand the resulting structures, and hence their properties, much is to be learnt from chemical kinetics about the properties of the systems in which they occur, e.g. about local molecular mobilities. For instance, polyaddition reactions may show a sudden gel (‘Trommsdorf’) effect due to the immobilisation of large radicals at the gel point, while polycondensations pass through this point without effects due to diffusion control becoming apparent. The critically branched state of matter (near a gel point) is connected with life and its processes, and is generally rich in quantitative information about network structure and properties. Chemical and physical evidence runs counter to the suggestion that bulk networks tend to shrink in the course of their formation. Curing and aging processes in highly cross-linked systems (stage iii) is governed by physics rather than chemistry, and can be treated in terms of the WLF transform.

Keywords

Diffusion Control Urea Formaldehyde Fractional Conversion Urea Formaldehyde Resin Primary Chain 
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.
    M. Gordon and I.D. McMillan, Makrocool. Chem. 23, 188 (1957)CrossRefGoogle Scholar
  2. 2.
    G.R. Dobson and M. Cordon, J. Chem. Phys. 43, 705 (1965)CrossRefGoogle Scholar
  3. 3.
    M. Gordon and G.R. Scantlebury, J. Chem. Soc. 1 (1967)Google Scholar
  4. 4.
    M. Gordon and G.R. Scantlebury, J. Polymer Sci., C16, 3933 (1968)Google Scholar
  5. 5.
    G.R. Scantlebury, Ph.D. Thesis, Polycondensation Statistics, London University (1965)Google Scholar
  6. 6.
    C.R. Austin, Fertilisation, Prentice-Hall, London, 1965, p. 1Google Scholar
  7. 7.
    E. Chargaff, The Origins of Prebiological Systems, Ed. S.W. Fox, Academic Press, New York and London, 1965, 169Google Scholar
  8. 8.
    H.M. James and E. Guth, J. Chem. Phys. 15, 669 (1947)CrossRefGoogle Scholar
  9. 9.
    M. Gordon, S.C. Hunter, J.A. Love and T.C. Ward, Nature, (London), 217, 735 (1968)CrossRefGoogle Scholar
  10. 10.
    S.C. Hunter, Proc. Edin. Math. Soc. 16, (ser. II), 57 (1968)Google Scholar
  11. 11.
    J. Brooks and H.P. Hale, Biochim. and Biophys. Acta, 32 237 (1959);Google Scholar
  12. H. Freundlich and W. Seifniz, Z. Phys. Chem. 104, 233 (1923)Google Scholar
  13. 12.
    D.S. Butler, M. Cordon and G.N. Malcolm, Proc. Roy. Soc. (London), A295, 29 (1966)CrossRefGoogle Scholar
  14. 13.
    G. Langhammer, Physik der Kunststoffe, Eds. W. Holzm’iller and K. Altenburg, Akademie Verlag, Berlin, 1961, p. 175.Google Scholar
  15. 14.
    M. Gordon and R.-J. Roe, J. Polymer Sci., 21, 39 (1956)CrossRefGoogle Scholar
  16. 15.
    M. Gordon, Proc. Int. Rubber Conference, Moscow (1969) in press.Google Scholar
  17. 16.
    B. Meissner, I. Klier and S. Kuchailk J. Polymer Sci., C16, 793 (1967)Google Scholar
  18. 17.
    M. Gordon, Plaste und Kautschuk, 12, 103 (1965)Google Scholar
  19. 18.
    S. Imai and M. Gordon, J. Chem. Phys. 50, 3889 (1969)CrossRefGoogle Scholar
  20. 19.
    M. Gordon and R.-J. Roe, J. Polymer Sci., 21, 57 (1956)CrossRefGoogle Scholar
  21. 20.
    R.M. Barrett and N. Gordon, The Physical Properties of Polymers, S.C.I. Monograph, No. 5, 183 (1959)Google Scholar
  22. 21.
    J. JandCek and J.D. Ferry, Macromolecules 2, 379 (1969)CrossRefGoogle Scholar
  23. 22.
    M. Gordon and W. Simpson, Polymer 2, 383 (1961)CrossRefGoogle Scholar
  24. 23.
    M.L. Williams, R.F. Landel and J.D. Ferry, J. Amer. Chem. Soc. 77, 3701 (1955)CrossRefGoogle Scholar
  25. 24.
    M. Gordon and B.M. Grieveson, J. Polymer Sci., 29, 9 (1958)CrossRefGoogle Scholar
  26. 25.
    K. Dusek and W. Prins, Advances in Polymer Science, 6, 1 (1969)CrossRefGoogle Scholar
  27. 26.
    K. Kajiwara, W. Burchard and M. Gordon, Brit. Polymer J., 2, 110 (1970)CrossRefGoogle Scholar
  28. 27.
    M. Gordon, Colloquia Mathematica Soc. J. Bolyai (Budapest), 4, 511 (1969)Google Scholar
  29. 28.
    K. Kajiwara, J. Chem. Phys., to appear September (1970)Google Scholar

Copyright information

© Springer Science+Business Media New York 1971

Authors and Affiliations

  • M. Gordon
    • 1
  • T. C. Ward
    • 1
    • 2
  • R. S. Whitney
    • 1
  1. 1.University of EssexColchesterEngland
  2. 2.Virginia Polytechnic InstituteUSA

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