13G NMR and ESR studies on the association between sodium 3-dodecy I ether-2-hydroxypropy1-1-sulfonate and polyvinylpyrrolidone
作者:
JINGCHENG MAO,
JIYE HU,
SHUCHUAN SHANG,
HONGJING LIU,
LITIAN HU,
期刊:
Journal of Dispersion Science and Technology
(Taylor Available online 1999)
卷期:
Volume 20,
issue 5
页码: 1345-1357
ISSN:0193-2691
年代: 1999
DOI:10.1080/01932699908943857
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The surfactant, sodium 3-dodecy] ether-2-hydroxypropyl-l-sulfonate(SDEHS) was synthesized. The association and standard free energy of formation of the complex between sodium 3-dodecyl etheT-2-hydroxypropyl-l-sulfonate(SDEHS) and polyvinyl-pyrrolidone(PVP) in an aqueous solution have been investigated using C NMR, ESR spectra, and surface tension measurements at the air/ water interface.13C NMR and ESR spectra all indicate that the basic structure of the complex is a micelle-like aggregate, the SDEHS molecules assembling on the methylidync(a) the methylene(α ) carbon in the backbone, and the methyleneβ carbon attached to the nitrogen of PVP molecules, and shield hydrocarbon groups on the surface of the micelle from contacting with water. The measurement results ofsurface tensions show that the amount of surfactant bound to the polymer are linear function of the polymer concentrations ( φ,WI% )i. e( c2-c1and the miceltization in the presence of PVP occurs at a lower concentration than the critical micelle concentration of SDEHS. The effectiveness of PVP in lowering the free energy of formation of the surfactant aggregates in aqueous solutions increases with the concentrations of PVP.
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