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DOI: 10.1039/A809842E (Paper) Reference Section for: J. Mater. Chem., 1999, 9, 1453-1460

Ferroelectric cyclic oligosiloxane liquid crystals

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David R. Medeiros, Michael A. Hale, Raymond J. P. Hung, Jeffrey K. Leitko and C. Grant Willson

Abstract

Chiral, smectogenic pendant groups have been covalently attached to cyclic oligosiloxanes by hydrosilylation. These materials and the olefinic compounds from which they were derived exhibit ferroelectric behavior. The mesomorphic range, and in particular the SC* phase, of these oligomers is greatly enhanced relative to the vinylogous parents. The electro-optic and thermal properties, in addition to the synthetic procedures used to prepare these materials, are described in detail. These compounds are seen as potential precursors to liquid crystalline polymers with desirable processing capabilities.

References

  1. H. Finkelmann, H. Ringsdorf, W. Siol and J. H. Wendorff, in Mesomorphic Order in Polymers and Polymerizations in Liquid Crystal Media, ed. A. Blumstein, American Chemical Society, Washington, DC, 1978 Search PubMed.
  2. H. Finkelmann, M. Happ, M. Portugall and H. Ringsdorf, Makromol. Chem., 1978, 179, 2541 CAS.
  3. V. Percec and H. Oda, J. Polym. Sci., Part A: Polym. Chem., 1995, 33, 2359 CrossRef.
  4. H. Poths, E. Wischerhoff, R. Zentel, A. Schönfeld, G. Henn and F. Kremer, Liq. Cryst., 1995, 18, 811 CrossRef CAS.
  5. R. D. C. Richards, W. D. Hawthorne, J. S. Hill, M. S. White, D. Lacey, J. A. Semlyn, G. W. Gray and T. C. Kendrick, J. Chem. Soc., Chem. Commun., 1990, 95 RSC.
  6. I. Nishiyama and J. W. Goodby, J. Mater. Chem., 1993, 3, 169 RSC.
  7. E. Wischerhoff and R. Zentel, Macromol. Chem. Phys., 1994, 195, 1593 CAS.
  8. G.-H. Hsiue, K.-R. Lee and J.-H. Chen, Macromol. Chem. Phys., 1995, 196, 2601 CAS.
  9. A. Kocot, R. Wrzalik, J. K. Vij and R. Zentel, J. Appl. Phys., 1994, 75, 728 CrossRef CAS.
  10. G. Decher, J. Reibel, M. Honig, I. G. Voigt-Martin, A. Dittrich, H. Ringdorf, H. Poths and R. Zentel, Ber. Bunsen-Ges. Phys. Chem., 1993, 97, 1386 CAS.
  11. M. Svensson, B. Helgee, K. Skarp and G. Andersson, J. Mater. Chem., 1998, 8, 353 RSC.
  12. G.-H. Hsiue and J.-H. Chen, Macromolecules, 1995, 28, 4366 CrossRef.
  13. K. D. Gresham, C. M. McHugh, T. J. Bunning, R. L. Crane, H. E. Klei and E. T. Samulski, J. Polym. Sci., Part A: Polym. Chem., 1994, 32, 2039 CAS.
  14. C. McHugh, D. W. Tomlin and T. J. Bunning, Macromol. Chem. Phys., 1997, 198, 2387 CAS.
  15. K. Grüneberg, J. Naciri and R. Shashidhar, Chem. Mater., 1996, 8, 2486 CrossRef.
  16. K. D. Gresham, C. M. McHugh, T. J. Bunning, H. E. Klei, E. T. Samulski and R. L. Crane, Polym. Prepr. (Am. Chem. Soc., Div. Polym. Chem.), 1993, 35, 697 Search PubMed.
  17. D. M. Walba, D. A. Zummach, M. D. Wand, W. N. Thurmes, K. M. More and K. E. Arnett, Proc. SPIE, Int. Soc. Opt. Eng., 1993, 1911, 21 Search PubMed.
  18. G. H. Mehl and J. W. Goodby, Angew. Chem., Int. Ed. Engl., 1996, 35, 2641 CrossRef CAS.
  19. J. W. Goodby, G. H. Mehl, I. M. Saez, R. P. Tuffin, G. Mackenzie, R. Auzély-Velty, T. Benvegnu and D. Plusquellec, Chem. Commun., 1998, 2057 RSC.
  20. S. G. McNamee, T. J. Bunning, S. S. Patnaik, C. M. McHugh, C. K. Ober and W. W. Adams, Liq. Cryst., 1995, 18, 787 CAS.
  21. K. B. Wagener, F. Zuluga and S. Wanigatunga, Trends Polym. Sci., 1996, 4, 157 Search PubMed.
  22. Q. Wang, H. Zhang, G. K. S. Prakash, T. E. Hogen-Esch and G. A. Olah, Macromolecules, 1996, 29, 6691 CrossRef CAS.
  23. J. W. Goodby, J. S. Patel and E. Chin, J. Mater. Chem., 1992, 2, 197 RSC.
  24. D. R. Medeiros, M. A. Hale, J. K. Leitko and C. G. Willson, Chem. Mater., 1998, 10, 1805 CrossRef CAS.
  25. S. M. Kelly and R. Buchecker, Helv. Chim. Acta, 1988, 71, 461 CAS.
  26. C. Lin, P. Cheng and A. Blumstein, Mol. Cryst. Liq. Cryst. Sci. Technol., Sect. A, 1995, 258, 173 Search PubMed.
  27. J. Naciri, J. Ruth, G. Crawford, R. Shashidhar and B. R. Ratna, Chem. Mater., 1995, 7, 1397 CrossRef CAS.
  28. J. Newton, H. Coles, P. Hodge and J. Hannington, J. Mater. Chem., 1994, 4, 869 RSC.
  29. J. Ojima, in The Chemistry of Organic Silicon Compounds, ed. S. Patai and Z. Rappoport, Wiley, New York, 1989, pp. 1479–1526 Search PubMed.
  30. J. K. Stille and D. B. Fox, J. Am. Chem. Soc., 1970, 92, 1274 CrossRef CAS.
  31. D. Drew and J. R. Doyle, in Inorganic Syntheses, ed. F. A. Cotton. McGraw-Hill, New York, 1971, vol. XIII, p. 47 Search PubMed.
  32. G. W. Gray and J. W. Goodby, Smectic Liquid Crystals, Textures and Structures, Hill, London, 1984 Search PubMed.
  33. I. Nishiyama, E. Chin and J. W. Goodby, J. Mater. Chem., 1993, 3, 161 RSC.
  34. K. Miyasato, S. Abe, H. Takezoe, A. Fukuda and E. Kuze, Jpn. J. Appl. Phys., 1983, 22, L661.
  35. R. B. Meyer, L. Liebert, L. Strzelecki and P. Keller, J. Phys. (Paris), 1975, 36, 69 Search PubMed.
  36. J. S. Patel and J. W. Goodby, Mol. Cryst. Liq. Cryst., 1987, 144, 117 CAS.
  37. G. H. Mehl and J. W. Goodby, Chem. Ber., 1996, 129, 521 CrossRef CAS.
  38. K. M. Blackwood, Science, 1996, 273, 909 CAS.
  39. S. T. Lagerwall and I. Dahl, Mol. Cryst. Liq. Cryst., 1984, 114, 151 CAS.
  40. A. E. Blatch, I. D. Fletcher and G. R. Luckhurst, Liq. Cryst., 1995, 18, 801 CAS.
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