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Displacement of poly(ethylene oxide) adsorbed on silica by a nonionic surfactant studied by spin labeling
Author(s) -
Hommel H.,
Van Damme H.
Publication year - 2002
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-002-0236-7
Subject(s) - chemistry , ethylene oxide , adsorption , pulmonary surfactant , electron paramagnetic resonance , site directed spin labeling , displacement (psychology) , nitroxide mediated radical polymerization , relaxation (psychology) , polymer , polymer chemistry , chemical engineering , nuclear magnetic resonance , organic chemistry , copolymer , radical polymerization , psychology , social psychology , biochemistry , physics , membrane , engineering , psychotherapist
Poly(ethylene oxide) chains labeled at one end by a nitroxide free radical were adsorbed on silica. The electron paramagnetic resonance spectrum is mainly sensitive to the local Brownian motion and shows lines typical of two different environments, namely, loops and tails protruding in solution with a fast motion, and trains adsorbed on the solid with a hindered motion. When a solution of nonionic Triton surfactant with different concentrations is put in contact with the coated surface, the polymer segments are progressively removed from the surface and the chains extend into solution. This displacement is recorded as a function of temperature and concentration and follows a well‐defined smooth path.