Abstract
Single crystals of poly(hydroxybutyrate), and copolymers of hydroxybutyrate and hydroxyvalerate, have been grown from a variety of solvents and their morphology studied. In all cases the crystals appear elongated, with the crystallographic a axis along the long axis of the crystals. Screw dislocations (which act as branch points and can lead to large crystal aggregates) have been observed, and solvents, e.g. octanol in which more of these dislocations occur, have been identified. Decoration of the crystals with polyethylene shows that the fold plane is the (0 1 0) plane, while crystallographic and crystallinity arguments require successive adjacent folds to be along 〈1 1 0〉 directions. It is argued that folding is along [1 1 0] on the top, and [1 ¯1 0] on the bottom surface of a crystal.
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References
E. A. Dawes, “Microbial Energetics” (Chapman and Hall, New York, 1986).
Y. Doi, “Microbial Polyesters” (VCH, New York, 1990).
P. A. Holmes, in “Developments in Crystalline Polymers-2”, edited by D. C. Basset (Elsevier, London, 1987) pp. 1–65.
P. J. Barham, J. Mater. Sci. 19 (1984) 3826.
P. J. Barham, A. Keller, E. L. Otun and P. A. Holmes, ibid. 19 (1984 2781.
P. J. Barham and A. Keller, J. Polym. Sci. B Polym. Phys. Ed. 24 (1986) 69.
E. L. Welland, J. Stejney, A. Halter and A. Keller, Polym. Commun. 30 (1989) 302.
C. Lauzier, R. H. Marchessault, P. Smith and H. Chanzy, Polymer 33 (1992) 823.
J. F. Revol, H. D. Chanzy, Y. Deslandes and R. H. Marchessault, Polymer 30 (1989) 1973.
R. H. Marchessault, S. Coulomb, H. Morikawa, K. Okamura and J. F. Revol, Can. J. Chem. 59 (1981) 38.
E. L. Otun, PhD thesis, University of Bristol (1985).
H. Mitomo, P. J. Barham and A. Keller, Polym. J. 19 (1987) 1241.
J. C. Wittman and B. Lotz, J. Polym. Sci. Polym. Phys. Ed 23 (1985) 205.
Idem., in “Materials Science and Technology”, Vol. 12, edited by E. Thomas (VCH, New York, 1993).
S. J. Organ and A. Keller, J. Polym. Sci. Polym. Phys. Ed. 25 (1978) 2409.
D. C. Bassett, Polymer 33 (1992) 2467.
P. A. Barker, PhD thesis, University of Bristol (1992).
R. H. Marchessault, Macromol. 19 (1986) 2865.
“Faraday Discussions of the Royal Society of Chemistry”, Vol. 68 edited by F. C. Frank, J. D. Hoffman, C. M. Guttman and E. A. DiMarzio (Fletcher, Norwich, 1979) pp. 7 and 177.
D. Seebach, H. M. BÜrger, H. M. MÜller, U. D. Lengweiler, A. K. Beck, K. E. Sykes, P. A. Barker and P. J. Barham, Helv. Chim. Acta 77 (1994) 1099.
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Birley, C., Briddon, J., Sykes, K.E. et al. Morphology of single crystals of poly (hydroxybutyrate) and copolymers of hydroxybuty rate and hydroxyvalerate. JOURNAL OF MATERIALS SCIENCE 30, 633–638 (1995). https://doi.org/10.1007/BF00356322
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DOI: https://doi.org/10.1007/BF00356322