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.
2015In Journal of Physical Chemistry B, 119, p. 1706-1716
Peer Reviewed verified by ORBi
 

Files


Full Text
2014_JPhysChemB_SAXS_CO2.pdf
Author preprint (2.54 MB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



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 :
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
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 19 December 2014

Statistics


Number of views
582 (26 by ULiège)
Number of downloads
6 (6 by ULiège)

Scopus citations®
 
13
Scopus citations®
without self-citations
8
OpenCitations
 
14

Bibliography


Similar publications



Contact ORBi