Weak Nematic Gels

  • P. G. de Gennes
Part of the Springer Series in Chemical Physics book series (CHEMICAL, volume 11)


We give some theoretical predictions concerning the mechanical, optical and electrical properties of weak networks made with nematic polymers. The network may be permanently crosslinked, or may exist only in transient states, and be due only to physical entanglements. We construct an elastic theory involving both the deformations of the gel and the distortions of the director field. We conclude that weak gels may show some interesting mechanooptic properties.


Pure Strain Conductance Anisotropy Optical Coefficient Nematic Order Planar Texture 
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Notes and References

  1. 1.
    See for instance, P.G. de Gennes, The Physics of Liquid Crystals, Oxford, 3d printing (1980).Google Scholar
  2. 2.
    H. Finkelmann, these proceedings p. 238Google Scholar
  3. 3.
    F. Brochard, J. de Phys. 40, 1049 (1979).CrossRefGoogle Scholar
  4. 4.
    J. Ferry, Viscoelastic Properties of Polymers, Willy, N.Y. (1970).Google Scholar
  5. 5.
    W. Graessley, Adv. Pol. Sci. 16 (1974).Google Scholar
  6. 6.
    P.G. de Gennes, Scaling Concepts in Polymer Physics, Cornell U.P., Ithaca, N.Y. (1979).Google Scholar
  7. 7.
    P.G. de Gennes, Comptes Rendu Acad. Sci. Paris, 281 B, 101 (1975).Google Scholar
  8. 8.
    J.P. Jarry, These Université Paris 6 (1978).Google Scholar
  9. 9.
    P.G. de Gennes, Molecular Crystals Letters 34, 177 (1977).CrossRefGoogle Scholar
  10. 10.
    In the present case the usual relation between k-1 and L might be upset because the splay elastic constant K1 is much larger than the bend constant K3.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1980

Authors and Affiliations

  • P. G. de Gennes
    • 1
  1. 1.Collège de FranceParis Cédex 05France

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