Morphological Change of the Micelle of Poly(styrene)-b-poly(2-vinylpyridine)-b-poly(ethylene oxide) Induced by Binding of Sodium Dodecyl Sulfate
- 5 May 2004
- journal article
- research article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 20 (12), 4809-4812
- https://doi.org/10.1021/la049762o
Abstract
Morphological change of a micelle of poly(styrene)-b-poly(2-vinylpyridine)-b-poly(ethylene oxide) (PS−PVP−PEO) polymer was induced by binding sodium dodecyl sulfate (SDS) to the PVP block in acidic aqueous solutions. The change in the size of SDS/PS−PVP−PEO complexes was detected by dynamic light scattering measurements and atomic force microscopy, and the binding of SDS was confirmed by zeta-potential measurements. When the micelle was free from SDS in acidic aqueous solutions, the hydrodynamic diameter of the micelle was 216 nm, reflecting the extended conformation of the PVP block due to the repulsion between protonated pyridine units. As the cationic PVP block was electrically neutralized with anionic SDS, the diameter was gradually reduced concomitant with the decrease in zeta-potential and finally reached 175 nm when the PVP block was completely neutralized. The decrease in the diameter shows the morphological change of the PVP block from extended to shrunken forms. Further addition of SDS did not cause the changes of the diameter nor zeta-potential. This indicates that SDS was not bound to the PS−PVP−PEO polymer after the PVP block was fully neutralized and that the hydrophobic binding of SDS to the polymer was negligible due to the low concentration of SDS.Keywords
This publication has 21 references indexed in Scilit:
- Association Phenomena of Poly(acrylic acid)-b-poly(2-vinylpyridine)- b-poly(acrylic acid) Triblock Polyampholyte in Aqueous Solutions: From Transient Network to Compact MicellesMacromolecules, 2003
- Light Scattering, Atomic Force Microscopy and Fluorescence Correlation Spectroscopy Studies of Polystyrene-block-poly(2-vinylpyridine)-block-poly(ethylene oxide) MicellesCollection of Czechoslovak Chemical Communications, 2003
- Fluorescence Studies on the Properties of the Nanoaggregates of Poly(ethylene oxide)-b-polymethacrylate Copolymer Formed by Binding of Cationic Surfactants to Polymethacrylate BlockLangmuir, 2002
- Effects of Block Length and Structure of Surfactant on Self-Assembly and Solution Behavior of Block Ionomer ComplexesLangmuir, 1999
- Fluorescence and FTIR Studies on the pH-Dependent Conformational Change of Poly(methacrylic acid) in Aqueous SolutionsBulletin of the Chemical Society of Japan, 1999
- Spontaneous Formation of Vesicles from Complexes of Block Ionomers and SurfactantsJournal of the American Chemical Society, 1998
- Soluble Complexes from Poly(ethylene oxide)-block-polymethacrylate Anions and N-Alkylpyridinium CationsMacromolecules, 1997
- Supramolecular Materials: Self-Organized NanostructuresScience, 1997
- pH-Dependent Micellization of Poly(2-vinylpyridine)-block-poly(ethylene oxide)Macromolecules, 1996
- Micellization of polystyrene-poly(ethylene oxide) block copolymers in water. 5. A test of the star and mean-field modelsMacromolecules, 1992