Rotational mobility of TEMPO spin probe in polypropylene: EPR spectra simulation and calculation via approximated formulas

Natalia A. Chumakova; Tatiana S. Yankova; Alexander I. Kokorin

doi:10.20944/preprints202407.1658.v1

Preprint Article Version 1 This version is not peer-reviewed

Version 1 : Received: 19 July 2024 / Approved: 21 July 2024 / Online: 22 July 2024 (10:00:55 CEST)

The rotational correlation times of a small compact spin probe (2,2,6,6-tetramethylpiperidin-1-yl)oxyl in isotactic polypropylene were obtained over a wide temperature range by EPR spectra simulation taking into account anisotropic rotation as well as distribution of probe molecules by rotational mobility. The averaged values of rotational correlation times were compared with the corresponding values calculated using well-known approximated formulas based on the intensities and widths of the spectral lines. It was shown that the calculated values can be used as effective parameters to characterize rotational mobility of the spin probe in the polymer matrix in a wide range of rotational correlation times.

spin probe TEMPO; polypropylene; rotational correlation time; distribution by rotational mobility; EPR spectra simulation; approximated formula.

Chemistry and Materials Science, Polymers and Plastics

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Rotational mobility of TEMPO spin probe in polypropylene: EPR spectra simulation and calculation via approximated formulas

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