Journal of Materials Science

, Volume 25, Issue 6, pp 2727–2736 | Cite as

Electron microscopy of non-periodic layer crystallites in thermotropic random copolymers

  • Richard J. Spontak
  • Alan H. Windle


Transmission electron microscopy (TEM) has been used to characterize non-periodic layer crystallites in thermotropic random copolyesters composed of 4-hydroxybenzoic acid and 2-hydroxy-6-naphthoic acid. The crystallites are most clearly observed when imaged in the equatorial reflection, indicating that they are associated with intermolecular ordering. The crystallites appear to be platelets with their thin axis parallel to the molecular chain axis. Crystallite growth is highly dependent on thermal history and occurs to a significant extent during the early stages of annealing above the glass-transition temperature in the solid state. Long-term annealing of the copolymers results in an increase in the number of crystallites, as well as sharpening the diffraction pattern. The extent of lateral development of the ordered regions also depends on the degree of polymerization (DP), being greater for a copolymer of lower DP.


Transmission Electron Microscopy Diffraction Pattern Solid State Thermal History Molecular Chain 
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  1. 1.
    J. Blackwell, A. Biswas andR. C. Bonart,Macromolecules 18 (1985) 2126.Google Scholar
  2. 2.
    R. A. Chivers, J. Blackwell andG. A. Gutierrez,Polymer 25 (1984) 435.Google Scholar
  3. 3.
    J. Blackwell andG. Gutierrez,ibid. 23 (1982) 671.Google Scholar
  4. 4.
    G. R. Mitchell andA. H. Windle,Coll. Polym. Sci. 263 (1985) 230.Google Scholar
  5. 5.
    T. J. Lemmon, S. Hanna andA. H. Windle,Polym. Commun. 30 (1989) 2.Google Scholar
  6. 6.
    D. J. Blundell,Polymer 23 (1982) 359.Google Scholar
  7. 7.
    G. A. Gutierrez et al., ibid. 24 (1983) 937.Google Scholar
  8. 8.
    G. D. Butzbach, J. H. Wendorff andH. J. Zimmermann,ibid. 27 (1986) 1337.Google Scholar
  9. 9.
    A. H. Windle at al., Faraday Disc. Chem. Soc. 79 (1985) 55.Google Scholar
  10. 10.
    S. Hanna andA. H. Windle,Polymer 29 (1988) 207.Google Scholar
  11. 11.
    R. Golombok, S. Hanna andA. H. Windle,Mol. Cryst. Liq. Cryst. 155 (1988) 281.Google Scholar
  12. 12.
    A. M. Donald andA. H. Windle,J. Mater. Sci. Lett. 4 (1985) 58.Google Scholar
  13. 13.
    A. M. Donald, C. Viney andA. H. Windle,Polymer 24 (1983) 155.Google Scholar
  14. 14.
    A. M. Donald andA. H. Windle,J. Mater. Sci. 18 (1983) 1143.Google Scholar
  15. 15.
    A. M. Donald,J. Mater. Sci. Lett. 3 (1984) 44.Google Scholar
  16. 16.
    A. M. Donald andA. H. Windle,Polymer 25 (1984) 1235.Google Scholar
  17. 17.
    Idem, J. Mater. Sci. 19 (1984) 2085.Google Scholar
  18. 18.
    C. Viney andA. H. Windle,ibid. 17 (1982) 2661.Google Scholar
  19. 19.
    E. L. Thomas, in “Structure of Crystalline Polymers”, edited by I. H. Hall (Elsevier Applied Science, London, 1984) Ch. 3.Google Scholar
  20. 20.
    D. T. Grubb,J. Mater. Sci. 9 (1974) 1715.Google Scholar
  21. 21.
    L. Reimer, in “Physical Aspects of Electron Microscopy and Microbeam Analysis” edited by B. M. Siegel and D. R. Beaman (Wiley, New York, 1975) Ch. 13.Google Scholar
  22. 22.
    L. C. Sawyer andD. T. Grubb, “Polymer Microscopy” (Chapman and Hall, London, 1987) pp. 62–70, 239–254.Google Scholar
  23. 23.
    C. Viney, A. M. Donald andA. H. Windle,Polymer 26 (1985) 870.Google Scholar
  24. 24.
    R. J. Spontak andA. H. Windle,ibid. (in press).Google Scholar
  25. 25.
    R. J. Spontak, T. J. Lemmon andA. H. Windle, manuscript in preparation.Google Scholar
  26. 26.
    M. G. Dobb, D. J. Johnson andB. P. Saville,J. Polym. Sci. Polym. Symp. 58 (1977) 237.Google Scholar
  27. 27.
    J. R. Minter, K. Shimamura andE. L. Thomas,J. Mater. Sci. 16 (1981) 3303.Google Scholar
  28. 28.
    G. Mazelet andM. Kléman,ibid. 23 (1988) 3055.Google Scholar

Copyright information

© Chapman and Hall Ltd 1990

Authors and Affiliations

  • Richard J. Spontak
    • 1
  • Alan H. Windle
    • 1
  1. 1.Department of Materials Science and MetallurgyUniversity of CambridgeCambridgeUK

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