[en] A new photo-sensitive diblock copolymer composed of a hydrophilic sequence of poly(ethylene oxide) (PEO) linked to a CO2-philic sequence of poly(1H,1H,2H,2H-heptadecafluorodecyl acrylate) (PFDA) by a light sensitive o- nitrobenzyl group was successfully synthesized by RAFT polymerization and used as stabilizer for the free radical polymerization of 2-hydroxyethyl methacrylate (HEMA) in dispersion in ?,?,?-trifluorotoluene and supercritical carbon dioxide (scCO2). Thanks to this fluorinated stabilizer, well-defined particles of PHEMA down to 350 nm of diameter were produced in scCO2. Advantageously, the photocleavable group at the block junction of the stabilizer could be cleaved by exposing the particles to UV light so that the fluorinated block could be extracted in TFT or scCO2. As supported by X-ray photoelectron spectroscopy (XPS) analysis, up to 80 % of the fluorinated block of the stabilizer can be removed, leading to efficient swelling and dispersion of the resulting PHEMA nanogels in water.
Research Center/Unit :
Center for Education and Research on Macromolecules (CERM) CESAM - Complex and Entangled Systems from Atoms to Materials - ULiège
Disciplines :
Chemistry Materials science & engineering
Author, co-author :
Alaimo, David; University of Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM), Center for Education and Research on Macromolecules (CERM)
Grignard, Bruno ; University of Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM), Center for Education and Research on Macromolecules (CERM)
Kuppan, Chandrasekar; Université catholique de Louvain (UCL), Institute of Condensed Matter and Nanosciences, Bio and Soft Matter
Adriaensen, Yasmine; Université catholique de Louvain (UCL), Institute of Condensed Matter and Nanosciences, Bio and Soft Matter
Genet, Michel J.; Université catholique de Louvain (UCL), Institute of Condensed Matter and Nanosciences, Bio and Soft Matter
Dupont-Gillain, Christine; Université catholique de Louvain (UCL), Institute of Condensed Matter and Nanosciences, Bio and Soft Matter
Gohy, Jean-François; Université catholique de Louvain (UCL), Institute of Condensed Matter and Nanosciences, Bio and Soft Matter
Fustin, Charles-André; Université catholique de Louvain (UCL), Institute of Condensed Matter and Nanosciences, Bio and Soft Matter
Detrembleur, Christophe ; University of Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM), Center for Education and Research on Macromolecules (CERM)
Jérôme, Christine ; University of Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM), Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Photocleavable stabilizer for the preparation of PHEMA nanogels by dispersion polymerization in supercritical carbon dioxide
Publication date :
21 January 2017
Journal title :
Polymer Chemistry
ISSN :
1759-9954
eISSN :
1759-9962
Publisher :
Royal Society Chemistry, Cambridge, United Kingdom
Volume :
8
Issue :
3
Pages :
581-591
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture F.R.S.-FNRS - Fonds de la Recherche Scientifique The Walloon Region in the frame of the PLAGreen and CO2Green programs
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