Reference : Small Angle X-ray Scattering Insights into the Architecture-Dependent Emulsifying Pro...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Physical, chemical, mathematical & earth Sciences : Physics
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/175372
Small Angle X-ray Scattering Insights into the Architecture-Dependent Emulsifying Properties of Amphiphilic Copolymers in Supercritical Carbon Dioxide
English
Alaimo, David mailto [University of Liège (ULg), Department of Chemistry, Center for Education and Research on Macromolecules (CERM) > > > >]
Hermida Merino, Daniel [European Synchrotron Radiation Facility > > > >]
Grignard, Bruno mailto [University of Liège (ULg), Department of Chemistry, Center for Education and Research on Macromolecules (CERM) > > > >]
Bras, Wim [European Synchrotron Radiation Facility > > > >]
Jérôme, Christine mailto [University of Liège (ULg), Department of Chemistry, Center for Education and Research on Macromolecules (CERM) > > > >]
Debuigne, Antoine mailto [University of Liège (ULg), Department of Chemistry, Center for Education and Research on Macromolecules (CERM) > > > >]
Gommes, Cédric mailto [Université de Liège - ULg > Département de chimie appliquée > Département de chimie appliquée >]
2015
Journal of Physical Chemistry B
American Chemical Society
119
1706-1716
Yes (verified by ORBi)
International
1520-6106
1520-5207
Washington
DC
[en] Water/CO2 emulsions ; Fluorinated polymers ; Macromolecular architecture ; Supramolecular assemblies ; Synchrotron small-angle scattering
[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.
Center for Education and Research on Macromolecules (CERM)
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/175372
10.1021/jp5086558
http://pubs.acs.org/doi/abs/10.1021/jp5086558

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