Small Angle X-ray Scattering Insights into the Architecture-Dependent Emulsifying Properties of Amphiphilic Copolymers in Supercritical Carbon Dioxide

Alaimo, David; Hermida Merino, Daniel; Grignard, Bruno; Bras, Wim; Jérôme, Christine; Debuigne, Antoine; Gommes, Cédric

doi:10.1021/jp5086558

Article (Scientific journals)

Small Angle X-ray Scattering Insights into the Architecture-Dependent Emulsifying Properties of Amphiphilic Copolymers in Supercritical Carbon Dioxide

Alaimo, David; Hermida Merino, Daniel; Grignard, Bruno et al.

2015 • In Journal of Physical Chemistry B, 119, p. 1706-1716

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/175372

DOI
10.1021/jp5086558

PubMed
25516221

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Keywords :

Water/CO2 emulsions; Fluorinated polymers; Macromolecular architecture; Supramolecular assemblies; Synchrotron small-angle scattering

Abstract :

[en] The supramolecular assembly of a series of copolymers combining a PEO-rich hydrophilic and fluorinated CO2-philic sequences is analysed by synchrotron small-angle xray scattering (SAXS) in supercritical CO2, as well as in water/CO2 emulsions. These copolymers were designed to have the same molecular weight and composition, and to differ only by their macromolecular architecture. The investigated copolymers have random, block, and palm-tree architectures. Besides, thermo-responsive copolymer is also analysed, having a hydrophilic sequence becoming water-insoluble around 41 °C, i.e. just above the critical point of CO2. At the length scale investigated by SAXS, only the random copolymer appears to self-assemble in pure CO2, in the form of a disordered microgel-like network. The random, block and thermo-responsive copolymers are all able to stabilize water/CO2 emulsions but not the copolymer with the palm-tree architecture, pointing at the importance of macromolecular architecture for the emulsifying properties. A modelling of the SAXS data shows that the block and the thermo-responsive copolymers form spherical micelle-like structures containing about 70 % water and 30 % polymer.

Research Center/Unit :

Center for Education and Research on Macromolecules (CERM)

Disciplines :

Chemistry
Physics
Materials science & engineering

Author, co-author :

Alaimo, David ; University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)

Hermida Merino, Daniel; European Synchrotron Radiation Facility

Grignard, Bruno ; University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)

Bras, Wim; European Synchrotron Radiation Facility

Jérôme, Christine ; University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)

Debuigne, Antoine ; University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)

Gommes, Cédric ; Université de Liège - ULiège > Département de chimie appliquée > Département de chimie appliquée

Language :

English

Title :

Small Angle X-ray Scattering Insights into the Architecture-Dependent Emulsifying Properties of Amphiphilic Copolymers in Supercritical Carbon Dioxide

Publication date :

2015

Journal title :

Journal of Physical Chemistry B

ISSN :

1520-6106

eISSN :

1520-5207

Publisher :

American Chemical Society, Washington, United States - District of Columbia

Volume :

119

Pages :

1706-1716

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://pubs.acs.org/doi/abs/10.1021/jp5086558

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique

Available on ORBi :

since 19 December 2014

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