Micropolarity and Order in the Reverse Micelles of L62 and L64 Pluronic Copolymers, As Studied by Molecular Probe Techniques

Autor:	Agneta Caragheorgheopol, Marilena Vasilescu, H. Caldararu, Rodica Bandula, Helge Lemmetyinen, Heikki Joela
Rok vydání:	1998
Předmět:	chemistry.chemical_classification Ethylene oxide Iodide Analytical chemistry Poloxamer Micelle Surfaces Coatings and Films Spin probe chemistry.chemical_compound chemistry Materials Chemistry Copolymer Propylene oxide Physical and Theoretical Chemistry Absorption (chemistry)
Zdroj:	The Journal of Physical Chemistry B. 102:7740-7751
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp981932g
Popis:	The reverse micelles of triblock copolymers poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) EO6PO36EO6 (Pluronic L62) and EO13PO30EO13 (Pluronic L64) in ternary (copolymer/o-xylene/water) and binary (copolymer/water) systems with different water contents were evidenced and investigated by fluorescence, absorption, and spin probe techniques. The spectral parameters of the polarity sensitive probes, 1-anilinonaphthalene-8-sulfonic acid (ANS), dansylhexadecylamine (Dansyl), pyrenesulfonic acid (PSA), 4-nitropyridine N-oxide (NP) and 4-(N,N‘-dimethyl-N-alkyl)ammonium 2,2‘,6,6‘-tetramethylpiperidine-1-oxyl iodide (CAT n), were related to the local hydration and polarity by comparison with a series of poly(oxyethylene)/water (TEG/water) calibration mixtures. The data were concordant and complementary, resulting in polarity profiles of the core for all systems and the relative radial positioning of the probes. The order of decreasing hydrophobic character found was Dansyl > NP > CAT 1...
Databáze:	OpenAIRE
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