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Authors Lappan, U. ; Wiesner, B. ; Scheler, U.
Title Rotational dynamics of spin-Labeled polyacid chain segments in polyelectrolyte complexes studied by CW EPR spectroscopy
Date 10.06.2015
Number 45392
Abstract A nitroxide spin label has been covalently linked to the weak polyacid poly(ethylene-alt-maleic acid) (P(E-alt-MA)) to study the rotational mobility of the polyacid backbone in polyelectrolyte complexes (PEC) formed with the oppositely charged strong polycation poly(diallyldimethylammonium chloride) (PDADMAC) in dependence on the pH of the dispersion and the temperature. The rotational mobility of the polyacid chain segments has been determined by simulation of the line shape of the continuous wave (CW) electron paramagnetic resonance (EPR) spectra using the microscopic order/macroscopic disorder (MOMD) model of restricted rotational diffusion. The study has shown that the diffusion coefficient characterizing the rotational motions of the polyacid backbone is significantly smaller at low degree of dissociation at pH 4 than at high degree of dissociation at pH 7 and pH 10.
Publisher Macromolecules
Wikidata Q105627690
Citation Macromolecules 48 (2015) 3577-3581
DOI https://doi.org/10.1021/ACS.MACROMOL.5B00474
Tags electron-paramagnetic-resonance dilute aqueous-solutions polystyrene esr neutralization easyspin spectra acid)

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