Charged diblock copolymers at interfaces: Micelle dissociation upon compression

Charged diblock copolymers at interfaces: Micelle dissociation upon compression

We use grazing incidence X-ray scattering to study the surface micellization of charged amphiphilic diblock copolymers poly(styrene-block-acrylic acid) at the air-water interface. Scattering interference peaks are consistent with the formation of hexagonally packed micelles. The remarkable increase...

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Published in:Europhysics letters Vol. 90; no. 2; p. 28004
Main Authors: Theodoly, O, Checco, A, Muller, P
Format: Journal Article
Language:English
Published: United States IOP Publishing 01-04-2010
EDP Sciences
Subjects:
82.35.Jk
82.35.Rs
82.70.Uv
Brushes
Charging
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Compressing
COMPRESSION
COPOLYMERS
DISSOCIATION
ELECTROSTATICS
Frozen
Mathematical models
Micelles
national synchrotron light source
Polystyrene resins
SCATTERING
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Abstract We use grazing incidence X-ray scattering to study the surface micellization of charged amphiphilic diblock copolymers poly(styrene-block-acrylic acid) at the air-water interface. Scattering interference peaks are consistent with the formation of hexagonally packed micelles. The remarkable increase of inter-micelle distance upon compression is explained by a dissociation of micelles into a brush. Hence, surface micelles reorganize, whereas micelles of the same copolymers in solutions are “frozen”. We show indeed that the energetic cost of unimer extraction from micelles is much lower for surface than for solution. Finally, a model combining electrostatic interactions and micelle/brush equilibrium explains surface pressure vs. area without free parameters.
AbstractList We use grazing incidence X-ray scattering to study the surface micellization of charged amphiphilic diblock copolymers poly(styrene-block-acrylic acid) at the air-water interface. Scattering interference peaks are consistent with the formation of hexagonally packed micelles. The remarkable increase of inter-micelle distance upon compression is explained by a dissociation of micelles into a brush. Hence, surface micelles reorganize, whereas micelles of the same copolymers in solutions are “frozen”. We show indeed that the energetic cost of unimer extraction from micelles is much lower for surface than for solution. Finally, a model combining electrostatic interactions and micelle/brush equilibrium explains surface pressure vs. area without free parameters.
Author Theodoly, O
Checco, A
Muller, P
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SubjectTerms 82.35.Jk
82.35.Rs
82.70.Uv
Brushes
Charging
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Compressing
COMPRESSION
COPOLYMERS
DISSOCIATION
ELECTROSTATICS
Frozen
Mathematical models
Micelles
national synchrotron light source
Polystyrene resins
SCATTERING
Title Charged diblock copolymers at interfaces: Micelle dissociation upon compression
URI http://iopscience.iop.org/0295-5075/90/2/28004
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