[en] There is an increasing interest in the specific physicochemical properties of gradient copolymers at interfaces. In this work, the phase behavior and interfacial properties of amphiphilic gradient copolymers at the water/CO2 interface are explored and compared to that of diblock copolymer counterparts. It is observed that spontaneous amphiphilic block-like gradient copolymers made of N,N-dimethylacrylamide, vinyl pivalate, and vinyl acetate exhibit slightly lower cloud point pressures in supercritical carbon dioxide (scCO2) than the corresponding diblock copolymers. Much more pronounced differences are established at the water/scCO2 interface, with larger critical aggregation concentration (CAC), much faster adsorption kinetics and equilibration, and lower surface tension for gradient copolymers. RAFT/MADIX polymerization allows the control of molar mass, composition, and microstructure of the copolymers of the study. These findings shed light on how microstructural control in amphiphilic copolymers can give access to a new range of macromolecular emulsifiers for CO2 media with improved properties.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM) CESAM Complex and Entangled Systems from Atoms to Materials (CESAM)
Disciplines :
Chemistry Materials science & engineering
Author, co-author :
Liu, Xuan; Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique (IMRCP), UMR 5623, University of Toulouse, France
Wang, Mingxi; Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique (IMRCP), UMR 5623, University of Toulouse, France
Harrisson, Simon; Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique (IMRCP), UMR 5623, University of Toulouse, France
Debuigne, Antoine ; University of Liège (ULiège), Complex and Entangled Systems from Atoms to Materials (CESAM), Center for Education and Research on Macromolecules (CERM)
Marty, Jean-Daniel; Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique (IMRCP), UMR 5623, University of Toulouse, France
Destarac, Mathias; Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique (IMRCP), UMR 5623, University of Toulouse, France
Language :
English
Title :
Enhanced stabilization of water-scCO2 interface by block-like spontaneous gradient copolymers
Publication date :
06 November 2017
Journal title :
ACS Sustainable Chemistry and Engineering
eISSN :
2168-0485
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Volume :
5
Issue :
11
Pages :
9645-9650
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique ANR - Agence Nationale de la Recherche CSC - Chinese Scholarship Council CNRS - Centre National de la Recherche Scientifique
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