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Complex Coacervation of Polyelectrolytes Studied by Spin‐Label EPR Spectroscopy
Author(s) -
Lappan Uwe,
Wiesner Brigitte,
Scheler Ulrich
Publication year - 2014
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201400052
Subject(s) - electron paramagnetic resonance , polyelectrolyte , maleic acid , chemistry , coacervate , spectroscopy , spin label , aqueous solution , site directed spin labeling , spectral line , polymer chemistry , analytical chemistry (journal) , copolymer , nuclear magnetic resonance , crystallography , polymer , organic chemistry , physics , biochemistry , quantum mechanics , astronomy
Spin‐labeled poly(ethylene‐ alt ‐maleic acid) (SL‐P(E‐ alt ‐MA)) with 2.5 mol% spin‐labeled repeat units is prepared to study the interaction of this polyanion with an oppositely charged polyelectrolyte by electron paramagnetic resonance (EPR) spectroscopy. The internal rotation of the spin label and the segmental rotational mobility of the polyanion in aqueous solution are determined by simulating the line shapes of the experimental EPR spectra as a function of temperature. The complex formation of SL‐P(E‐ alt ‐MA), a weak polyanion, with the strong polycation poly(diallyldimethylammonium chloride) (PDADMAC) is studied, in dependence of the mixing ratio. If the spin‐labeled polyanion is the excess component, the spectrum of a slow‐moving component is superimposed by the spectrum of a fast‐moving component. In the opposite case, the spectra are dominated by a slow‐moving component.