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Journal of Materials Science

, Volume 26, Issue 5, pp 1368–1374 | Cite as

Nucleation, growth and morphology of poly(hydroxybutyrate) and its copolymers

  • S. J. Organ
  • P. J. Barham
Papers

Abstract

Measurements of the melting temperatures, growth rates and nucleation rates of meltcrystallized polyhydroxybutyrate (PHB) and two poly(hydroxybutyrate-co-hydroxyvalerate) (PHB/HV) copolymers are reported for crystallization over a wide range of temperature. Examples are shown of the spherulitic morphologies obtained. From the variation in melting point with crystallization temperature values for the equilibrium melting points of PHB and PHB/HV are obtained. Growth and nucleation rate measurements are analysed using secondary nucleation theory to obtain approximations to surface energies within the crystals. PHB and PHB/7% HV are described well by secondary nucleation theory. PHB/23% HV exhibits more complex crystallization and melting behaviour, which suggests temperature-dependent exclusion of HV units from the crystals.

Keywords

Polymer Growth Rate Crystallization Melting Point Surface Energy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    M. Lemoigne, Ann. Inst. Past. 39 (1925) 144.Google Scholar
  2. 2.
    J. Merrick, Photosynth. Bact. 199 (1978) 219.Google Scholar
  3. 3.
    E. A. Dawes and P. J. Senior, Adv. Microbiol. 10 (1973) 138.Google Scholar
  4. 4.
    J. S. Herron, J. D. King and D. C. White, Appl. Environ. Microbiol. 35 (1978) 251.Google Scholar
  5. 5.
    N. G. Carr, Biochem. Biophys. Acta 120 (1966) 308.Google Scholar
  6. 6.
    L. L. Wallen and W. K. Rohwedder, Environ. Sci. Technol. 8 (1974) 576.CrossRefGoogle Scholar
  7. 7.
    A. C. Ward, B. I. Rowley and E. A. Dawes, J. Gen. Microbiol. 102 (1977) 61.CrossRefGoogle Scholar
  8. 8.
    P. A. Holmes, in “Developments in Crystalline Polymers 2”, edited by D. C. Bassett (Elsevier, London, 1987) p. 1.Google Scholar
  9. 9.
    P. J. Barham, A. Keller, E. L. Otun and P. A. Holmes, J. Mater. Sci. 19 (1984) 2781.CrossRefGoogle Scholar
  10. 10.
    P. J. Barham, ibid. 19 (1984) 3826.CrossRefGoogle Scholar
  11. 11.
    P. J. Barham and A. Keller, J. Polym. Sci. Polym. Phys. Edn 24 (1986) 69.CrossRefGoogle Scholar
  12. 12.
    S. J. Organ and P. J. Barham, J. Mater. Sci. Lett. 8 (1989) 621.CrossRefGoogle Scholar
  13. 13.
    J. D. Hoffman and J. J. Weeks, J. Chem. Phys. 37 (1962) 1723.CrossRefGoogle Scholar
  14. 14.
    J. D. Hoffman, Polymer 24 (1983) 3.CrossRefGoogle Scholar
  15. 15.
    F. P. Price, in “Nucleation”, edited by A. C. Zettlemayer (Marcel Dekker, New York, 1969) p. 56.Google Scholar
  16. 16.
    P. A. Barker, F. Mason and P. J. Barham, J. Mater. Sci. 25 (1990) p. 1952.CrossRefGoogle Scholar

Copyright information

© Chapman and Hall Ltd. 1991

Authors and Affiliations

  • S. J. Organ
    • 1
  • P. J. Barham
    • 1
  1. 1.H.H. Wills Physics LaboratoryUniversity of BristolBristolUK

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