Journal of Materials Science

, Volume 35, Issue 4, pp 999–1008 | Cite as

PDLC based on unsaturated polyester resins: molecular, morphological and thermo-optical analysis

  • M. Abbate
  • P. Mormile
  • E. Martuscelli
  • P. Musto
  • L. Petti
  • G. Ragosta
  • P. Villano
Article

Abstract

A thermosetting matrix based on an unsaturated polyester resin was employed to realise a Polymer Dispersed Liquid Crystal (PDLC) system by a UV induced curing process. A molecular, morphological and thermo-optical characterisation of this system is presented. The chemical and structural properties were investigated by transmission FT-IR spectra in the near infrared frequency range and by dynamic-mechanical analysis. The results indicated that, upon curing, the matrix retains its intrinsic properties even for compositions very rich in the LC component (40 wt %). The morphology, investigated by optical and electron microscopy, showed phase separation before and after the curing process. Image analysis demonstrated that the cured materials had morphological features suitable to achieve interesting thermo-optical properties. In particular, the composition containing 40 wt % of LC exhibited the typical behaviour of a thermo-optical switch. Interesting optical bistability effects were also demonstrated for this particular composition.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    IAM-CHOON Khoo and SHIN-TRON Wu, “Optics and Nonlinear Optics of Liquid Crystals,” Part 2 (Word Scientific Ed., 1993) ch. 2.Google Scholar
  2. 2.
    R. A. Weiss and C. K. Ober, “ACS Symposium Series,” Vol. 435 (1990) Ch. 32, pp. 475-495.Google Scholar
  3. 3.
    B. G. Wu, J. H. Erdmann and J. W. Doane, Liq. Cryst. 5, (1989) 1453.Google Scholar
  4. 4.
    P. Drzaic, J. Appl. Phys. 60 (1986) 2142.Google Scholar
  5. 5.
    N. A. Vaz, G. W. Smith and G. P. Montgomery Jr., Liq. Cryst. 146 (1987) 1.Google Scholar
  6. 6.
    M. Mucha, J. Appl. Polym. Sc. 43 (1991) 175-182.Google Scholar
  7. 7.
    L. Bouteiller and P. Le barny, Liq. Cryst. 21(2) (1996) 157-174.Google Scholar
  8. 8.
    H. S. Kitzerow, ibid. 16(1) (1994) 1-31.Google Scholar
  9. 9.
    Y. S. Yang and L. J. Lee, Macromolecules 20 (1987) 1490.Google Scholar
  10. 10.
    Y. J. Huang and J. S. Leu, Polymer 34 (1993) 295.Google Scholar
  11. 11.
    Y. S. Yang and L. J. Lee, J. Appl. Polym. Sci. 36 (1998) 1325.Google Scholar
  12. 12.
    E. Martuscelli, P. Musto, G. Ragosta and G. Scarinzi, Polymer 37 (1996) 4025.Google Scholar
  13. 13.
    R. Dell'erba, M. Martuscelli, P. Musto, G. Ragosta and M. Leonardi, Polym. Networks Blends 7 (1997) 1.Google Scholar
  14. 14.
    R. Yamaguchi and S. Sato, Liq. Cryst. 14(4) (1993) 929-935.Google Scholar
  15. 15.
    S.-C. Peng, J.-W. Yu and S.-N. Lee, J. Polym. Sci. 35(9) (1997) 1373-1381.Google Scholar
  16. 16.
    B. K. Kim and Y. S. Ok, J. Appl. Polym. Sci. 49 (1993) 1769-1775.Google Scholar
  17. 17.
    J. D. Margerum, A. M. Lackner, E. Ramos, K.-C. Lim and W. H. Smith, Liq. Cryst. 5(5) (1989) 1477-1487.Google Scholar
  18. 18.
    L. Boutellier, P. Le barny and PH. Martinotlagarde, ibid. 17(5) (1994) 709-716.Google Scholar
  19. 19.
    R. S. Lenk and J. C. Padget, Eur. Polym. J. 11 (1975) 327.Google Scholar
  20. 20.
    D. Melot, B. Escaig, J. M. Lefebvre, R. P. Eustache and F. Laupetre, J. Polym. Sci. Polym. Phys. Edn. 32 (1994) 249.Google Scholar
  21. 21.
    M. Gordon and J. S. Taylor, J. Appl. Chem. 2 (1952) 493.Google Scholar
  22. 22.
    G. B. Al'tshuler, M. V. Inochkin and A. A. Manenkov, Sov. Phys. Dokl. 30(7) (1985) 574-575.Google Scholar
  23. 23.
    U. Bernini, L.DESTEFANO, M. Feo, P. Mormile and P. Russo, Optics Communications 112 (1994) 169-174.Google Scholar
  24. 24.
    R. W. Boyd, “Nonlinear Optics,” (Academic Press 1992) Ch. 6.Google Scholar

Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • M. Abbate
    • 1
  • P. Mormile
    • 2
  • E. Martuscelli
    • 1
  • P. Musto
    • 3
  • L. Petti
    • 2
  • G. Ragosta
    • 1
  • P. Villano
    • 1
  1. 1.Institute of Research and Technology of Plastic MaterialsNational Research Council of ItalyArco Felice (Naples)Italy
  2. 2.Institute of CyberneticsNational Research Council of ItalyArco Felice (Naples)Italy
  3. 3.Institute of Research and Technology of Plastic MaterialsNational Research Council of ItalyArco Felice (Naples)Italy

Personalised recommendations