Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Spin-Probe Study of Aqueous Soap and Polysoap Solutions
Masayuki AizawaTsuyoshi KomatsuTsurutaro Nakagawa
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1977 Volume 50 Issue 12 Pages 3107-3110


Poly(2-vinylpyridine) partially quaternized with 1-dodecylbromide, a “polysoap,” sodium dodecyl sulfate (SDS), and dodecylpyridinium bromide (DPBr) in their micellar solutions were investigated by the spin-probe technique. It was found that the alkyl side chains in polysoap micelles associate more rigidly than in low-molecular surfactant micelles. This fact is attributed to the surface active groups covalently connected to long polymer chains in the polysoap molecule. By a recently developed method, the rotational correlation times of 2,2,6,6-tetramethyl-4-benzoyloxypiperidin-1-oxyl radical in SDS and DPBr micelles were found to be 5.9×10−10 and 3.5×10−10 s/rad, respectively. From the values of the isotropic hyperfine splitting constants, it was estimated that the DPBr micelle solubilizes the probe molecule at a more inner site of the hydrophobic portion than does the SDS micelle.

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