Abstract
In this work, to characterize the mobility of different sections of the macromolecules of polyurethane (PUR), polyvinyl alcohol (PVA), and polylactic acid (PLA), as well as the density of crosslinks of the polymer chains when using fillers, we used the distributions of spin–lattice and spin–spin relaxation times for the protons. It is shown that the rigidity of the thermoplastic polymers depends on the sizes of the granules of the diatomite filler, which can embed in the polymer matrix. Consequently, relaxation times are reduced. If PLA is the filler of PUR, the dynamics of the molecules in the chains and the spin–spin interaction of the protons are affected by the crosslinking of PUR by PLA. An increase in crosslinks density reduces the rate of polymer degradation.
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Acknowledgement
N.S. and I.M. thank the Russian Foundation for Basic Research (RFBR, project no. 18-03-00089a) for the financial support, and are grateful to Dr. Hans-Joachim Grafe, Dr. Adam Diogardi and Dr. Sabine Wurmehl from IFW Institute for Solid State Research for helpful discussions and assistance with the experiments.
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JK-L: Synthesis of samples, investigation, conceptualization. NS: Visualization, methodology, software. IM: Measurements, signal analysis. JH: Reviewing, editing, supervision.
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The authors [J. Kucinska‑Lipka, N. Sinyavsky, I. Mershiev, J. Haponiuk] certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in this manuscript. The authors declare no conflict of interest.
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Kucinska‑Lipka, J., Sinyavsky, N., Mershiev, I. et al. Study of the Effect of Filling Thermoplastic Medical Polyurethane with PVA, PLA or Diatomite on the Relaxation Times Distributions of 1H NMR. Appl Magn Reson 51, 759–768 (2020). https://doi.org/10.1007/s00723-020-01216-y
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DOI: https://doi.org/10.1007/s00723-020-01216-y