Title Influence of the nature of the ion pairs on the segmental dynamics in polyelectrolyte complex coacervates
Date 14.11.2017
Number 53794
Abstract A spin label has been covalently attached to the weak polyanion poly(ethylene-alt-maleic acid) (P(E-alt-MA)) to study the segmental dynamics of the polyanion backbone in polyelectrolyte complex coacervate phases formed with oppositely charged polycations such as poly(diallyldimethylammonium chloride) (PDADMAC), linear poly(ethylenimine) (l-PEI) and poly(allylamine hydrochloride) (PAH) by continuous wave (CW) electron paramagnetic resonance (EPR) spectroscopy. The segmental rotational mobility of the spin-labeled polyanion has been determined by the simulation of the line shape of the experimental CW EPR spectra using the microscopic order/macroscopic disorder (MOMD) model of restricted rotational diffusion. The study has shown that the segmental mobility of the polyanion backbone in the coacervate phases decreases in the sequence PDADMAC > l-PEI > PAH. The nature of the ion pairs formed between the oppositely charged polyelectrolytes has a strong impact on the dynamics of the polyanion.
Publisher Macromolecules
Identifier 0
Citation Macromolecules 50 (2017) 8631-8636
Authors Lappan, U. ; Scheler, U.
Tags electron-paramagnetic-resonance chain rotational-dynamics dilute aqueous-solutions epr spectroscopy esr neutralization simulations polystyrene multilayers easyspin

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