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Applied Magnetic Resonance

, Volume 49, Issue 4, pp 403–413 | Cite as

Impregnation of Polycarbonate by Paramagnetic Probe 2,2,6,6-Tetramethyl-4-Hydroxy-Piperidine-1-Oxyl (TEMPOL) in Supercritical CO2

  • A. A. Akovantseva
  • V. N. Bagratashvili
  • N. A. Chumakova
  • E. N. Golubeva
  • O. I. Gromov
  • S. V. Kuzin
  • M. Ya. Melnikov
  • P. S. Timashev
Original Paper

Abstract

The aim of the research was to test the advantages of spin probe electron paramagnetic resonance approach in studying polymers impregnation with organic molecules in supercritical CO2 (scCO2) The impregnation of bisphenol A polycarbonate with the spin probe TEMPOL was carried out at 307–343 K and 11.6–35 MPa. The mean and local concentrations of the spin probe in the polymer were evaluated. An increase in temperature and pressure resulted in a more even distribution of the dopant in the polymer matrix. It was observed that, at 307 K and 19.6 MPa, the spin probe was located only near the surface of the sample. Local mobility of the spin probe molecules was found to be similar in polycarbonate films impregnated in scCO2 and cast from dichloroethane solution. It was shown that changes in the structure of the surface and bulk of the polymer detected by the atomic force and optical polarization microscopy are not directly related with the distribution of the dopant molecules and their average content in the polymer.

Notes

Acknowledgements

We thank the Russian Science Foundation (Grant 14-33-00017) for financial support related to the supercritical fluid impregnation of polycarbonate by TEMPOL. We also are grateful to the Russian Foundation for Basic Research (project nos. 16-03-00333 and 17-02-00445) for financial support related to EPR spectra registration and analysis.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Chemistry DepartmentLomonosov Moscow State UniversityMoscowRussian Federation
  2. 2.Institute of Photonic Technologies, Research Center “Crystallography and Photonics” RASMoscowRussian Federation
  3. 3.Institute for Regenerative MedicineSechenov UniversityMoscowRussian Federation

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