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

26 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.

LanguageEnglish
Pages3831-3840
Number of pages10
JournalPolymer
Volume36
Issue number20
DOIs
Publication statusPublished - 1 Jan 1995

Fingerprint

X ray scattering
Synchrotrons
Polymers
Melting
Copolymers
Crystals
Homopolymerization
Melting point
Differential scanning calorimetry
Annealing
Heating
poly-beta-hydroxybutyrate
poly(3-hydroxybutyrate)-co-(3-hydroxyvalerate)
Temperature

Keywords

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

Cite this

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title = "Time-resolved synchrotron small angle X-ray scattering studies of poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) polymers",
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.",
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author = "Rule, {R. J.} and Liggat, {J. J.}",
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Time-resolved synchrotron small angle X-ray scattering studies of poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) polymers. / Rule, R. J.; Liggat, J. J.

In: Polymer, Vol. 36, No. 20, 01.01.1995, p. 3831-3840.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Time-resolved synchrotron small angle X-ray scattering studies of poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) polymers

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AU - Liggat, J. J.

PY - 1995/1/1

Y1 - 1995/1/1

N2 - 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.

AB - 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.

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KW - annealing

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KW - crystals

KW - differential scanning calorimetry

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KW - morphology

KW - thermal effects

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