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Polymers with terminally cyanobiphenyl-substituted side chains

A re-entrant polymorphism N SA NRe

Summary

Two acrylate side chain polymers in which the mesogenic moiety is a 4′-cyano-biphenyl-4-yl group have been synthesized and characterized by d.s.c., optical microscopy and X-ray diffraction. If the mesogenic moiety is linked to the polymer backbone by a -O-CO-(CH2)-5 group, the resultant polymer is nematic. For a -O-(CH2)-6 group, the unusual NSANre sequence is observed. X-ray diffraction has shown that the SA phase has a partially bilayer structure : the molecules are arranged in an antiparallel, overlapping interdigitated structure with a layer spacing of about 1.4 times the length of the side chains. Monolayer fluctuations are also observed in this SA phase.

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References

  1. 1.

    W.H. de Jeu, Solid State Commun. 41, 529 (1982)

  2. 2.

    D. Guillon, P.E. Cladis and J. Stamatoff, Phys. Rev. Lett. 41, 1598 (1978)

  3. 3.

    F. Hardouin, A.M. Levelut and G. Sigaud, J. Physique, 42, 71 (1981)

  4. 4.

    P. Le Barny, J.C. Dubois, C. Friedrich and C. Noël, to be published

  5. 5.

    D. Demus and L. Richter “Textures of Liquid Crystals”, Verlag Chemie, Weinheim, 1978

  6. 6.

    S.G. Kostromin, Z. Tsch. Efendieva, R.V. Talroze, V.P. Shibaev and N.A. Platé, Proceedings of the 6 th Liquid Crystal Conference of Socialist Countries, Halle, Abstract D 26, 1985

  7. 7.

    F. Hardouin, A.M. Levelut, M.F. Achard and G. Sigaud, J. Physique, 80, 53 (1983)

  8. 8.

    J.E. Lydon and C. Coakley, J. Physique, Colloque 36, C1–45 (1975)

  9. 9.

    A.J. Leadbetter, J.C. Frost, J.P. Gaughan, G.W. Gray and A. Mosley, J. Physique, 40, 375 (1979)

  10. 10.

    P. Le Barny, J.C. Dubois, R. Njeumo, J.P. Parneix, C. Legrand, to be published in Liquid Crystals.

  11. 11.

    A.M. Levelut and C. Druon, J. Physique Lett. 43, L-193 (1982)

  12. 12.

    C. Legrand, J.P. Parneix, A. Chapoton, N.H. Tinh and C. Destrade, J. Physique Lett. 45, L-283 (1984)

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Correspondence to Pierre Le Barny.

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Le Barny, P., Dubols, J., Friedrich, C. et al. Polymers with terminally cyanobiphenyl-substituted side chains. Polymer Bulletin 15, 341–348 (1986). https://doi.org/10.1007/BF00254853

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Keywords

  • Polymer
  • Microscopy
  • Optical Microscopy
  • Chain Polymer
  • Acrylate