Solid State ¹³C Nuclear Magnetic Resonance Study of Morphology and Molecular Mobility in Quenched Poly(3-hydroxybutyrate)

• Authors: A. Baran , P. Vrábel , D. Olčák
• Languages of publication: EN

Abstracts

EN

Single pulse magic angle spinning ¹³C NMR spectra and the carbon spin-lattice relaxation times T₁(¹³C) were used for the study of morphology and molecular mobility in poly(3-hydroxybutyrate) quenched in cold water after melting in a twin-screw extruder. The crystallinity of the quenched sample was found to be comparable with that of virgin material, and the decrease in dimensions of the crystallites grown after quenching was deduced from the single pulse magic angle spinning ¹³C NMR spectra. The spin-lattice relaxation curves for the carbons of the CO, CH, CH₂ and CH₃ groups were found to be bi-exponential, which enables the molecular mobility within crystalline and amorphous domains to be studied. The spin-lattice relaxation times T₁(¹³C) estimated for the carbons of the CO, CH, CH₂ groups show the chain mobility enhancement within crystalline domains of the quenched sample, but the influence of the quenching on the CH₃ group rotation and on the main chain motion within amorphous regions was not observed.

Keywords

EN

61.41.+e; 81.05.Lg; 76.60.-k; 74.25.nj

Discipline

• 76.60.-k: Nuclear magnetic resonance and relaxation(see also 33.25.+k Nuclear resonance and relaxation in atomic and molecular physics and 82.56.-b Nuclear magnetic resonance in physical chemistry and chemical physics; for structure determination using magnetic resonance techniques, see 61.05.Qr; for biophysical applications, see 87.80.Lg; for NMR in superconducting materials, see 74.25.nj)
• 61.41.+e: Polymers, elastomers, and plastics(see also 81.05.Lg in materials science; for rheology of polymers, see section 83; for polymer reactions and polymerization, see 82.35.-x in physical chemistry and chemical physics)
• 74.25.nj: Nuclear magnetic resonance
• 81.05.Lg: Polymers and plastics; rubber; synthetic and natural fibers; organometallic and organic materials(for polymers and organic materials in electrochemistry, see 82.45.Wx)

• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 1144-1146

Dates

published

2017-04

Contributors

author

A. Baran

• Department of Physics, Faculty of Electrical Engineering and Informatics, Technical University of Košice, Park Komenského 4, 042 00 Košice, Slovakia

author

P. Vrábel

• Department of Physics, Faculty of Electrical Engineering and Informatics, Technical University of Košice, Park Komenského 4, 042 00 Košice, Slovakia

author

D. Olčák

• Department of Physics, Faculty of Electrical Engineering and Informatics, Technical University of Košice, Park Komenského 4, 042 00 Košice, Slovakia

References

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• [6] D. Olčák, V. Hronský, M. Kovalaková, P. Vrábel, I. Chodák, P. Alexy, Int. J. Polym. Anal. Charact. 20, 396 (2015), doi: 10.1080/1023666X.2015.1033831
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Identifiers

DOI

10.12693/APhysPolA.131.1144