Estimation of the Degree of Crystallinity of Partially Crystalline Polypropylenes Using ^{13}C NMR

• Authors: V. Hronský , M. Koval'aková , P. Vrábel , M. Uhrínová , D. Olčák
• Languages of publication: EN

Abstracts

EN

The paper deals with a method for the estimation of the degree of crystallinity for partially-crystalline isotactic-polypropylenes (i-PP) using high-resolution solid-state ^{13}C NMR. For this purpose direct polarization ^{13}C MAS NMR spectra were measured for i-PP samples with different degrees of crystallinity at 98°C. The areas beneath the resonance lines in these spectra correspond to the number of carbons in particular functional groups, while the widths and shapes of the lines reflect the degree of crystallinity, crystalline modifications, distribution of chain conformations and the chain mobility. The ^{13}C MAS NMR spectra, measured using appropriate combination of delay time and high proton decoupling field, made it possible to detect only amorphous domains in the sample. This enabled identification of the lines associated with the amorphous domains in the complete ^{13}C MAS NMR spectra and provided sufficient information for reliable estimation of the degree of crystallinity. The heteronuclear Overhauser enhancement of the ^{13}C NMR signals due to short delay time was taken into account in our calculations.

Keywords

EN

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

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)
• 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)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 1
• Pages: 409-410

Dates

published

2014-07

Contributors

author

V. Hronský

• Department of Physics, Faculty of Electrical Engineering and Informatics, Technical University of Košice, Park Komenského 2, 042 00 Košice, Slovakia

author

M. Koval'aková

• Department of Physics, Faculty of Electrical Engineering and Informatics, Technical University of Košice, Park Komenského 2, 042 00 Košice, Slovakia

author

P. Vrábel

• Department of Physics, Faculty of Electrical Engineering and Informatics, Technical University of Košice, Park Komenského 2, 042 00 Košice, Slovakia

author

M. Uhrínová

• Department of Physics, Faculty of Electrical Engineering and Informatics, Technical University of Košice, Park Komenského 2, 042 00 Košice, Slovakia

author

D. Olčák

• Department of Physics, Faculty of Electrical Engineering and Informatics, Technical University of Košice, Park Komenského 2, 042 00 Košice, Slovakia

References

• [1] O. Fričová, M. Uhrínová, V. Hronský, M. Kovaĺaková, D. Olčák, I. Chodák, J. Spěváček, eXPRESS Polym. Lett. 6, 204 (2012), doi: 10.3144/expresspolymlett.2012.23
• [2] R. Kitamaru, Advances in Polymer Science 137, 41 (1998), doi: 10.1007/3-540-69685-7
• [3] M.H. Levitt, Spin Dynamics: Basics of Nuclear Magnetic Resonance, 2nd ed., Willey, p. 566
• [4] X. Zhang, Y. Zhao, Z. Wang, C. Zheng, X. Dong, Z. Su, P. Sun, D. Wang, C.C. Han, D. Xu, Polymer 46, 5956 (2005), doi: 10.1016/j.polymer.2005.05.004

Identifiers

DOI

10.12693/APhysPolA.126.409