Time-resolved synchrotron small angle X-ray scattering studies of poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) polymers

R. J. Rule, J. J. Liggat

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Time-resolved synchrotron small-angle X-ray scattering measurements have been performed during the heating and melting of poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate). A rapid, continuous rise in d-spacing was observed during melting, consistent with the disappearance of thinner, unstable crystals from stacks of lamellae possessing a broad distribution of thicknesses. The thickening of the remaining crystals has been characterized during the annealing of a copolymer close to its melting temperature. Differential scanning calorimetry measurements have indicated the presence of multiple melting endotherms in the case of the copolymer but not in the homopolymer. These multiple endotherms have been related to the effects of the hydroxyvalerate units in limiting the thickness of the lamellae at any given temperature.

Original languageEnglish
Pages (from-to)3831-3840
Number of pages10
JournalPolymer
Volume36
Issue number20
DOIs
Publication statusPublished - 1 Jan 1995

Keywords

  • poly(3-hydroxybutyrate)
  • structure
  • X-ray scattering
  • annealing
  • copolymers
  • crystals
  • differential scanning calorimetry
  • heating
  • melting
  • morphology
  • thermal effects

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