Impregnation of Polymers with 2,2,6,6-Tetramethyl-4-Oxo-Piperidin-1-Oxyl (TEMPONE) Paramagnetic Probe in Sub- and Supercritical СО2

2016, №1

сс. 32-42

E.N. Golubeva, O.I. Gromov, N.A. Chumakova, E.D. Feklichev, M.Ya. Mel’nikov, V.N. Bagratashvili

Key words: supercritical СО₂, polymers, impregnation, spin probes

Spin probe method is used to investigate the impregnation of polycarbonate (PC),
poly(ethylene oxide) (PEO) and cross-linked co-polymer of acrylamide and acrylic
acid (PAA) with organic molecules from sub- and supercritical CO₂ media. The data
of the electron paramagnetic resonance (EPR) spectroscopy show that paramagnetic
molecules of 2,2,6,6-tetramethyl-4-oxo-pi peridin-1-oxyl (TEMPONE) at 196 bar and
307 K penetrate into polymers, which are in glassy (PC) and elastic (PEO) states. In
the same conditions impregnation of PAA with TEMPONE is negligible. Unlike in
PEO, local concentrations of TEMPON in PC are higher than average values, thus
demonstrating a much less uniform distribution of the probe in the latter polymer.
Temperature variations of EPR spectra indicate that rotational mobility of probe
molecules in PEO is higher than in PC. The obtained results demonstrate that the spin
probe method is a promising approach to study the features of the processes on microand
macro-levels in «polymer — supercritical solvent — organic additive» systems.

Translated article

doi:10.1134/S1990793116080121

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ГОСТ
7.0.100-2018

Голубева, Е.Н. Impregnation of Polymers with 2,2,6,6-Tetramethyl-4-Oxo-Piperidin-1-Oxyl (TEMPONE) Paramagnetic Probe in Sub- and Supercritical СО2 / Е.Н. Голубева, О.И. Громов, Н.А. Чумакова [и др.]. – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2016. – Т. 11. – № 1. – С. 32-42.

TRANSLIT

N., E. Impregnaciya polimerov paramagnitnym zondom 2,2,6,6-tetrametil-4-oksopiperidin-1-oksil (TEMPON) v sub- i sverhkriticheskom SO2 / E. N. Golubeva, O.I. Gromov, N.A. CHumakova [i dr.]. – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2016. – Т. 11. – № 1. – S. 32-42.

E.N. Golubeva, O.I. Gromov, N.A. Chumakova, E.D. Feklichev, M.Ya. Mel’nikov, V.N. Bagratashvili Impregnation of Polymers with 2,2,6,6-Tetramethyl-4-Oxo-Piperidin-1-Oxyl (TEMPONE) Paramagnetic Probe in Sub- and Supercritical СО2. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 32-42 (2016). https://doi.org/

Impregnation of Polymers with 2,2,6,6-Tetramethyl-4-Oxo-Piperidin-1-Oxyl (TEMPONE) Paramagnetic Probe in Sub- and Supercritical СО2

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