Saint-Nazaire-les-Eymes, France
Saint-Nazaire-les-Eymes, France

Time filter

Source Type

Delhorbe V.,Cergy-Pontoise University | Thiry X.,CNRS Physical Eletrochemistry Materials and Interfaces Lab | Cailleteau C.,CEA Grenoble | Mourier E.,University Claude Bernard Lyon 1 | And 11 more authors.
Journal of Membrane Science | Year: 2012

The purpose of this study has been to develop new proton-exchange membranes based on semi-interpenetrating polymer network (semi-IPN) architectures for application in polymer electrolyte fuel cells. A series of semi-IPNs combining a fluorinated hexane network and a linear sulfonated poly(aryl ether ether ketone) (SPEEK) has been obtained by varying the SPEEK content from 50 to 80. wt.%. A telechelic functionalized acrylate oligomer was obtained by acrylation of α,ω-fluorinated hexanediol, while SPEEK was synthesized by polycondensation of sulfonated difluorobenzophenone with the bisphenol 6F. These semi-IPN membranes have been characterized by infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, scanning electron microscopy, and small-angle X-ray scattering. A semi-IPN containing 60. wt.% SPEEK has been tested as a fuel cell membrane. © 2011 Elsevier B.V.


Mabrouk W.,ERAS Labo | Mabrouk W.,French National Conservatory of Arts and Crafts | Mabrouk W.,Analytical Chemistry and Electrochemical Laboratory | Ogier L.,ERAS Labo | And 4 more authors.
Journal of Membrane Science | Year: 2014

Synthesis and characterization of new ion exchange membranes made from chlorosulfonated polyethersulfone (SO2Cl-PES) crosslinked by polyaminated crosslinking reagents have been performed. Two examples are described: one crosslinked by hexane diamine, the other by amino-polyethersulfone (NH2-PES). Sulfonated polyether sulfone (S-PES) and NH2-PES have similar chemical structures that allow compatibility. Surprisingly enough, better results were obtained using amino-polyethersulfone. The best results have been obtained using SO2Cl-PES with 1.3 SO2Cl group per monomer unit crosslinked by 0.2 equivalent of NH2-PES. The membranes, less brittle than pristine SPES and insoluble in solvents such as DMAc, were characterized by TGA, DMA, DSC, ionic conductivity, transport numbers, and water swelling. The results showed that these membranes presented very promising performances for use in Proton Exchange Membrane Fuel Cells. © 2013 Elsevier B.V.


Delhorbe V.,Cergy-Pontoise University | Reijerkerk S.R.,CEA Grenoble | Cailleteau C.,CNRS Structure and Properties of Molecular Architectures Laboratory | Bathfield M.,Charles Gerhardt Institute | And 9 more authors.
Journal of Membrane Science | Year: 2013

Original membranes based on an interpenetrating polymer network (IPN) architecture combining a poly(2-acrylamido-2-methyl-1-propane sulfonic acid) (AMPS) network and a fluorinated network were synthesized. The AMPS weight compositions were varied from 50 to 70. wt%. The first network was achieved by radical copolymerization of AMPS with a fluorinated telechelic diacrylate while the second one was obtained by photoinitiated cationic copolymerization of telechelic fluorinated diepoxide with trimethylol propane triglycidyl ether. The morphologies of these different IPNs were deduced from small-angle X-ray scattering (SAXS) spectra and dynamic thermomechanical analysis (DMTA). The main functional properties related to their use as proton exchange membrane in fuel cells were quantified, such as water vapor sorption, liquid water uptake (22-59. wt%), proton conductivity (1-63. mS/cm), gas permeability (0.06 and 0.80 barrer for dry oxygen and hydrogen, respectively), and oxidative and thermal stabilities. More precisely, the effects of the ionic exchange capacity (IEC) varying from 1.73 to 2.43. meq/g and the cross-linking density of the conducting phase on the morphology and the properties of IPN membranes were studied in detail. Finally, these IPN membranes were tested as fuel cell membrane and a correlation between the ex-situ and in-situ characterizations was established. © 2012 Elsevier B.V.


Danyliv O.,University Grenoble Alpes | Danyliv O.,ERAS Labo | Danyliv O.,French National Center for Scientific Research | Iojoiu C.,University Grenoble Alpes | And 9 more authors.
Journal of Fluorine Chemistry | Year: 2016

Bottom-up synthesis of perfluorosulfonic acid ionomers based on the high performance backbone is rarely performed, due to the difficulty of obtaining ionic monomers of high purity. Such an approach, however, results in ionic polymers of well-defined chemical structure and ionic group distribution. Here copper-mediated synthesis of an ionic monomer bearing a perfluorosulfonate group and two polymerizable fluorine-sites was studied. Its synthesis and purification were investigated with accuracy to find the least time-consuming and the most technologically advantageous protocol (the overall yield of the monomer consisted 76%). The monomer was subjected to polycondensation with commercial non-ionic monomers, and a series of ionomers of different ionic concentration (and thus ion exchange capacity, IEC) was obtained. The resultant ionomers demonstrated excellent film-forming properties. The obtained membranes were characterized by high glass transition temperature (>160 °C) and high proton conductivity (10−2–10−1 S/cm at 60–90 °C and 95% relative humidity). Such results make these materials promising for use in fuel cells. © 2016


Grauzam S.,Joseph Fourier University | Grauzam S.,CNRS Complex Medical Engineering Laboratory | Henri M.,French Institute of Health and Medical Research | Henri M.,Joseph Fourier University | And 11 more authors.
IRBM | Year: 2011

A new technique of insulin resistance assessment, using nuclear imaging, was developed. On a model of experimental myocardial infarction in rats, our results indicate a significant phenomenon of cardiac insulin resistance seven days after ischaemia. This study demonstrates the sensitivity of the technique for measuring insulin resistance by nuclear imaging. © 2011 Elsevier Masson SAS. All rights reserved.


Mabrouk W.,ERAS Labo | Mabrouk W.,French National Conservatory of Arts and Crafts | Mabrouk W.,University of Tunis | Ogier L.,ERAS Labo | And 5 more authors.
Fuel Cells | Year: 2012

Our goal in the present work was to synthesize a new proton exchange membrane that could be used in proton exchange membrane fuel cell (PEMFC), based on a blend of sulfonated polyethersulfone (S-PES) and sulfonated polyethersulfone octylsulfonamide (S-PESOS). Five blends, using S-PESOS with different grafting ratios of sulfonamide groups, have been elaborated, characterized, and tested in a PEMFC. The similar chemical structure between these two polymers favored their compatibility. The synthesized membranes showed a high water swelling capacity and an ionic conductivity equivalent to that of Nafion® (0.1 S cm -1) in the same conditions. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Dimastromatteo J.,French Institute of Health and Medical Research | Dimastromatteo J.,Joseph Fourier University | Dimastromatteo J.,ERAS Labo | Riou L.M.,French Institute of Health and Medical Research | And 22 more authors.
Journal of Nuclear Cardiology | Year: 2010

Background: Myocardial angiogenesis following reperfusion of an infarcted area may impact on patient prognosis and pro-angiogenic treatments are currently evaluated. The non-invasive imaging of angiogenesis would therefore be of potential clinical relevance in these settings. 99mTc-RAFT-RGD is a novel 99mTc-labeled tracer that targets the αvβ 3 integrin. Our objective was to determine whether this tracer was suitable for myocardial angiogenesis imaging. Methods and Results: A rat model of reperfused myocardial infarction was employed. Fourteen days following reperfusion, the animals were injected with 99mTc-RAFT-RGD or with its negative control 99mTc-RAFT-RAD. Fourteen animals were dedicated to autoradiographic imaging, infarct staining, and gamma-well counting of myocardial activity. In vivo dual-isotope pinhole SPECT imaging of 201Tl and 99mTc-RAFT-RGD or 99mTc-RAFT-RAD was also performed in 11 additional animals. Neovessels were observed by immunostaining in the infarcted and peri-infarct areas. 99mTc-RAFT- RGD infarct-to-normal ratios by gamma-well counting and ex vivo imaging (2.5 ± 0.6 and 4.9 ± 0.9, respectively) were significantly higher than those of 99mTc-RAFT-RAD (1.7 ± 0.2 and 2.2 ± 0.4, respectively, P < .05). The infarcted area was readily visible in vivo by SPECT with 99mTc-RAFT-RGD but not with 99mTc-RAFT-RAD (infarct-to-normal zone activity ratio, 2.5 ± 0.6 and 1.7 ± 0.4, respectively, P < .05). Conclusion: 99mTc-RAFT-RGD allowed the experimental in vivo molecular imaging of myocardial angiogenesis. © 2010 American Society of Nuclear Cardiology.


Mabrouk W.,Tunis el Manar University | Mabrouk W.,University of Carthage | Mabrouk W.,CNRS Process and Engineering in Mechanics and Materials Laboratory | Ogier L.,ERAS Labo | And 4 more authors.
Desalination and Water Treatment | Year: 2015

Two new types of proton exchange membranes used in proton exchange membrane fuel cell (PEMFC) were synthesized from sulfochlorinated polyethersulfone (PES (polyarylethersulfone)–SO2Cl). One, called S-PESB, was obtained by grafting butylphenol in an amount of 0.3 equivalent per monomer unit. The second (S-PESTD) was prepared by cross-linking with 0.1 equivalent of 4,7,10-trioxa-1,13-tridecandiamine. Analysis of thermal properties (thermogravimetric analysis and DSA) and mechanical testing (dynamical and thermomechanical analysis) of the two membranes showed a significant improvement in comparison with unmodified polyethersulfone sulfonic acid (S-PES). Thus, a significant lowering of the glass transition temperature was observed. In addition, a comparative study carried out with the commercial Nafion® membrane gave very similar values of ionic conductivity and a high selectivity of proton transport. A preliminary electrochemical study of membrane/electrode assembly has shown that the elaborated membranes are promising in PEMFC application. Power densities obtained with cross-linked S-PESTD were superior to those of commercial Nafion®, while S-PESB led to comparable values. © 2015 Balaban Desalination Publications. All rights reserved.

Loading ERAS Labo collaborators
Loading ERAS Labo collaborators