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Abstract
Aqueous solutions of the ionomer poly(ethylene-co-methacrylic acid) (EMAA) in the concentration range 0.5−23 wt % were studied by the electron spin resonance (ESR) spin probe method. The spin probes selected for this study were 4-(N,N-dimethyl-N-alkyl)ammonium-2,2,6,6-tetramethylpiperidine-1-oxyl iodides (CATn) with different alkyl groups: methyl (CAT1), octyl (CAT8), and hexadecyl (CAT16). The main objective of this study was to compare the ESR spectra of the CATn probes as a function of temperature and ionomer content in order to deduce details on the structure and dynamics of EMAA micelles and on the interface region between the aggregates and the solvent. ESR spectra were recorded in the temperature range 120−360 K, and the line shape variations and the 14N hyperfine splittings, aN, were key parameters for the interpretation of the results in terms of the spin probe mobility, and its location in and bonding to the polymeric aggregates. The detection of two spectral components in the ESR spectra of th...
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