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Thermoresponsiveness of hybrid micelles from poly(ethylene glycol)-block-poly(4-vinylpyridium) cations and SO4(2-) anions in aqueous solutions
- Source :
- Langmuir : the ACS journal of surfaces and colloids. 22(4)
- Publication Year :
- 2006
-
Abstract
- The SO4(2-)-induced micellization of poly(ethylene glycol)-block-poly(4-vinylpyridium) (PEG110-b-P(4-VPH+)35) and the thermoresponsiveness of these hybrid micelles are studied by dynamic and static light scattering. When the concentration of H2SO4 is high enough, PEG110-b-P(4-VPH+)35 forms stable hybrid micelles with an ionic core of P(4-VPH+)35/SO4(2-) and a PEG corona at 25 degrees C. The formation of the hybrid micelles is reversible. A thermodynamic equilibrium exists between the hybrid micelles and PEG110-b-P(4-VPH+)35 unimers. The shifts of the equilibrium are mainly attributed to the variation of the electrostatic energy and entropic energy of the system. Therefore, the temperature can determine the states of the equilibrium, which means that the dissociation or the formation of the hybrid micelles can be triggered by just varying the temperature.
- Subjects :
- Anions
Aqueous solution
Hot Temperature
Thermodynamic equilibrium
Ionic bonding
Surfaces and Interfaces
Sulfuric Acids
Condensed Matter Physics
Electrostatics
Micelle
Dissociation (chemistry)
Polyethylene Glycols
chemistry.chemical_compound
chemistry
Chemical engineering
Cations
Electrochemistry
Organic chemistry
General Materials Science
Static light scattering
Ethylene glycol
Spectroscopy
Micelles
Subjects
Details
- ISSN :
- 07437463
- Volume :
- 22
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- Langmuir : the ACS journal of surfaces and colloids
- Accession number :
- edsair.doi.dedup.....f65b164c02e2312189d8ddd6a96283cf