Year 2005, Month 5 (Section Full Articles, Page 1148)
Determination of molecular orientation distribution
of stable paramagnetic probes in stretched polymers
A. Kh. Vorob´ev* and N. A. Chumakova
The possibility of determination of the orientation distribution functions of paramagnetic
probes in stretched polymers by analyzing the angular dependence of EPR spectra was demonstrated taking two stable radicals, 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl and
2-septadecyl-2,3,4,5,5-pentamethylimidazolidine, as examples. The method employed permits establishment of the preferred orientation of the probe molecules relative to the polymer
macromolecules. The technique is responsive to changes in the orientation distribution of
impurity particles on annealing of the matrix.
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