Tesis sobre el tema "Matériau activé par acide"
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Yang, Qi. "Résistance au feu de géopolymère alcalin et de de géopolymère acide". Electronic Thesis or Diss., Centrale Lille Institut, 2024. http://www.theses.fr/2024CLIL0014.
Texto completoThis work deals with the fire resistance properties of geopolymers alkali- or acid-activated.The first part deals with the state of the art of the development of geopolymer materials,including their synthesis process, activation methods, application scenarios, and the influenceof their components on properties. A particular focus is on their potential benefit as fire-resistant materials. The thesis reveals the superior fire resistance of alkaline geopolymers andinvestigate the factors affecting the fire resistance, including the Al/Si ratio, and type ofcations. The results evidence that the lower the Al/Si ratio, the more the geopolymer softensat high temperatures (≥ 100°C) and expands due to the driving force of water vaporization.Compared to sodium-based geopolymers, potassium-based geopolymers have a lower levelof polymerization for the same curing time. Even with a high Al/Si ratio, low-polymerizationsilicates can form and cause the geopolymer to expand at high temperatures. In contrast,sodium-based geopolymers undergo higher complete polymerization reactions but lose theirsoftening ability at high temperatures (≥ 100°C) and are prone to cracking.Similar to alkali-activated geopolymers, acid-activated geopolymers exhibit good fireresistance thanks to their intumescence characteristics upon heating. The main factorinfluencing such property is the P/Al ratio. When the P/Al ratio is high (≥ 0.74), a largeamount of slightly condensed phosphorus is generated, which dehydrates and condensesupon heating, causing the material to soften and expand. Due to this intumescencecharacteristic, geopolymers with low Al/Si (alkaline geopolymer) or high P/Al (acidicgeopolymer) are promising fire-resistant material
Le, Rouzic Mathieu. "Étude des propriétés physico-chimiques et mécaniques des matériaux cimentaires à base d’oxyde de magnésium". Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1082/document.
Texto completoMagnesium phosphate cements are the most representative cements of the activated-by-acid cements family. Despite the fact that they are known since the early 20th century, their use in civil engineering is fairly limited. These materials are used for road repairs where the fast compressive strength development is an advantage. Recently they have also been used in wastes stabilization/solidification (S/S), especially with wastes incompatible with Portland cement. The challenges of the use of these cements are related to the nature of their formation reaction: fast, very exothermic, with a very short setting time (only a few minutes).The bonding phase, k-struvite (MgKPO4.6H2O), is obtained from magnesium oxide mixed in water with monopotassium phosphate (KH2PO4).MgO + KH2PO4 + 5H2O MgKPO4.6H2OThe setting mechanisms are still poorly known and various theories, involving or not secondary product formation, have been suggested. Our researches have aimed to understand the setting mechanisms, as well as the influence of the formulation parameters on the properties of the magnesium phosphate cement. Results show that the formation of k-struvite involved a precipitation-dissolution reaction of an intermediate product, the newberyite (MgHPO4.3H2O). Formation reactions of these two products are controlled by the supersaturation rate and the pH of the solution. The study highlights the strong effect of water on the properties of fresh cement paste. With a low mass ratio e/c in comparison of Portland cement (ratio e/c between 0,1 and 0,25), a slight modification of the ratio (0,02) leads to a segregation and a surface heterogeneity of the cement paste. Among the formulation parameters, the molar ratio MgO/KH2PO4 (Mg/P) seems the most important parameter. Indeed, it impacts most of the properties of the magnesium phosphate cement (compressive strength, setting time, reaction heat, paste fluidity …). Low Mg/P ratios lead to poor water resistance, to crystals formation inside the microstructure that can be seen on the surface of the sample (an efflorescence appearance), and to important swelling of the paste, leading to the cracking of the samples. After the parametric study, a magnesium phosphate cement paste has been defined. Dimensional changes and chemical shrinkage measurement were conducted to understand the mechanisms involved in this swelling phenomenon. In support, microstructural analyses (SEM, XRD, TGA) and leaching tests complete the experimental campaign. The results confirm the influence of a low Mg/P ratio on cement swelling and water resistance. Finally, a study on various additions to the paste has been conducted, with the purpose of improving the cement paste performances. It shows that the addition of an inert filler (siliceous sand or fly ashes) has a retarding effect and reduced the reaction heat
Rifai, Farah. "Immobilisation de déchets magnésiens dans un matériau alcali-activé : étude expérimentale et numérique". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN043/document.
Texto completoThe operation phase of the first generation of nuclear reactors in France has generated magnesium and graphite long lived low-level wastes (LLW-LL). Their conditioning in a hydraulic binder matrix is being addressed. In order to study the behavior of these packages, several coupled mechanisms have to be considered: the magnesium alloy can corrode within the encapsulating matrix, especially when galvanic coupling with the graphite occurs. The corrosion of the metal results in the development of corrosion products. The growth of corrosion products around the metal and the restriction of the hydraulic binder’s delayed strains may lead to the generation of internal stresses. The verification of certain safety requirements (dimensional stability of the package and low hydrogen production) is therefore essential. It requires the development of a numerical model able to predict the behavior of these packages.In particular, a sodium hydroxide activated blast furnace slag mortar is being addressed. It belongs to the family of alkali-activated materials for which the modelling of ageing behavior is rarely approached. Hence, the construction of the numerical model involves a large experimental campaign covering the thermo-chemo-mechanical behavior of the alkali-activated mortar and the corrosion of magnesium in hydraulic binders. Meso-scale homogenization calculations are undertaken in order to determine upscaled properties of the mix (matrix + wastes) and carry out simulations on the scale of the packages.Regarding the first experimental study axis, a relatively low hydration heat is measured. This is beneficial with respect to the internal stress generated from the self-restriction of the thermal strains within massive structures.Nevertheless, the materials undergoes a particular autogenous shrinkage strains showing an increase even at long term. However, its basic creep strains are shown to be important which could result in stress relaxation and avoids damage related to shrinkage restriction.Regarding the metal’s corrosion behavior in the alkali-activated mortar, it is compared to the one in two different ordinary Portland cement (OPC) based mortars. Microscopic observations are conducted on samples especially designed to monitor the galvanic corrosion of the alloy. They show the aggressiveness in OPC mortars (localized corrosion manifested by holes and layered microstructure) against limited homogeneous corrosion in alkali-activated mortar. Additionnaly, corrosion kinetics are determined using different experimental methods: mass loss and electrochemical measurements. The complementary results of these two types of measurements also show a low corrosion in the alkali-activated slag mortar with a passive state of the metal achived at 6 months of embedment. This advantage of slag mortar is explained by a high electrical resistivity with respect to OPC mortars, determined by electrochemical impedance spectroscopy.Finite element simulations are performed using Cast3m software on meso-scale in order to evaluate the mechanical effect of the corrosion layer development on the surrounding matrix. The corrosion kinetics of the alloy, the nature of corrosion products and their mechanical properties identified using SEM/EDS and nano-indentation techniques are implemented. The calculations indicate low stress generation in the alkali-activated mortar
Vidil, Thomas. "Contrôle du procédé d'élaboration et des propriétés d'un matériau époxy via la chimie supramoléculaire". Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066142.
Texto completoControlling the pot life and the gelation of epoxy resins is a crucial issue in thermosets processing. In this study, we report about the control of the gel time (tgel) and the gel conversion (xgel) for the cationic polymerization of commercial epoxy resins. To this end, hydroxyl additives are used as chain transfer agent to control xgel. Concurrently, oligo(ethylene oxide) additives are used to vary tgel as a result of the supramolecular complexation of the anilinium cations responsible for the polymerization’s initiation. We show that the combination of these two control levers enables the exploration of a wide range of tgel and xgel values. When a cyclic oligo(ethylene oxide) (18-crown-6) is used, anilinium cations are stabilized on very long period as a result of strong host-guest interactions. In absence of transfer agent, a slight increase of temperature is enough to observe the dissociation of the anilinium•18-crown-6 complex and the fast initiation of polymerization. The anilinium•18-crown-6 complex can be isolated and used as a thermoresponsive initiator presenting a high apparent activation energy. When used in combination with hydroxyl additives, a temperature increase results in a long delay of polymerization followed by the rapid completion of the material’s reticulation. By varying the composition of the initial mixture it is possible to tailor the duration of the polymerization’s delay. Thus, the resulting system is programmable and exhibits a clock like behavior. This chemistry is then extended to the copolymerization of diepoxy and monoepoxy resins to control the crosslink’s density of the material and thus, the properties of the final networks
Vidil, Thomas. "Contrôle du procédé d'élaboration et des propriétés d'un matériau époxy via la chimie supramoléculaire". Electronic Thesis or Diss., Paris 6, 2015. http://www.theses.fr/2015PA066142.
Texto completoControlling the pot life and the gelation of epoxy resins is a crucial issue in thermosets processing. In this study, we report about the control of the gel time (tgel) and the gel conversion (xgel) for the cationic polymerization of commercial epoxy resins. To this end, hydroxyl additives are used as chain transfer agent to control xgel. Concurrently, oligo(ethylene oxide) additives are used to vary tgel as a result of the supramolecular complexation of the anilinium cations responsible for the polymerization’s initiation. We show that the combination of these two control levers enables the exploration of a wide range of tgel and xgel values. When a cyclic oligo(ethylene oxide) (18-crown-6) is used, anilinium cations are stabilized on very long period as a result of strong host-guest interactions. In absence of transfer agent, a slight increase of temperature is enough to observe the dissociation of the anilinium•18-crown-6 complex and the fast initiation of polymerization. The anilinium•18-crown-6 complex can be isolated and used as a thermoresponsive initiator presenting a high apparent activation energy. When used in combination with hydroxyl additives, a temperature increase results in a long delay of polymerization followed by the rapid completion of the material’s reticulation. By varying the composition of the initial mixture it is possible to tailor the duration of the polymerization’s delay. Thus, the resulting system is programmable and exhibits a clock like behavior. This chemistry is then extended to the copolymerization of diepoxy and monoepoxy resins to control the crosslink’s density of the material and thus, the properties of the final networks
Martin, Pascal Guy Pierre. "Etude du potentiel de régulation génique exercé par l'isoforme alpha du récepteur activé par les proliférateurs de peroxysomes (PPARalpha)". Toulouse 3, 2007. http://thesesups.ups-tlse.fr/226/.
Texto completoThe alpha isoform of the peroxisome proliferator-activated receptors (PPARalpha) is a member of the nuclear receptor superfamily (Chapter I). Following its activation by various compounds, PPARalpha (Chapter II) regulates the transcription of several target genes, many of which are involved in lipid metabolism. We developed a cDNA macroarray (Chapter III) dedicated to PPARalpha and its heterodimerization partner the retinoïd X receptor (RXR). This tool was used to study the gene expression regulations induced by the activation of PPARalpha through various stimuli which are linked to the fields of : i) pharmacology (PPARalpha and RXR-activating drugs, Chapter IV), ii) nutrition (dietary fatty acids, Chapter V) and iii) physiopathology (fasting, Chapter VI). These in vivo studies illustrate the activation of PPARalpha by fatty acids provided either by low-fat diets or by adipose tissue lipolysis during fasting. They also demonstrate that the PPARalpha signaling pathway is influenced by RXR activation in vivo
Dodet, Bénédicte. "Etude des propriétés oxydantes de mélanges gazeux activés par décharge électrique à pression atmosphérique : interaction avec un matériel biologique". Paris 11, 2005. http://www.theses.fr/2005PA112335.
Texto completoIn recent years, non-thermal plasma processes have been studied and developed for medical applications such as surface decontamination. The work presented here deals with the study of the oxidative properties of atmospheric pressure dielectric barrier discharge effluents. Investigations were mainly focused on hydrogen peroxide formation mechanisms. An optimum production of H2O2 has been obtained using an argon/water vapour mixture as a discharge feed gas; excited argon atoms are implied to be responsible in water vapour dissociation and thereby for OH radical formation. A maximum energy yield value of 4 g(H2O2) / kWh has been reached under these conditions. The decontamination efficiency of such atmospheric discharge effluents was found to be quite high when tested by treating surfaces bearing nucleic acids and proteins. Furthermore, results from the interaction of the discharge effluents with biologic materials could be used as non direct diagnostic tools for the identification of the active species; DNA and protein degradation results raised the HO2 radical as a specie that was significantly involved in their degradation processes. In a similar way, bacteria spore inactivation treatment with discharge feed gas containing oxygen showed that a short lived species, O2 (1 Đg) singlet oxygen, was efficient for this inactivation. Results from the discharge effluent interaction with proteins and DNA were finally used to propose fundamental mechanisms occurring during the inactivation of bacteria spores using the same process: combined action of oxidative species and acidification lead in aqueous phase to spore coat permeation; these oxidative species coming from dissolution of. .
Bourgoin, Xavier. "Elaboration et caractérisation physico-chimique de nanocomposites plomb/céramique pour batteries acides". Thesis, Nancy 1, 2007. http://www.theses.fr/2007NAN10137/document.
Texto completoThe lead alloys generally employed as electrode substrates of lead acid battery are Pb-Ca-Sn. The microstructural evolutions lead to the depreciation of mechanical and chemical properties. This work deals with new materials in order to replace Pb-Ca-Sn alloys. The battery-life extension and recycling improvement are advantageous for industrial and environment. First part of this study shows deleterious effects of secondary elements in recycled lead alloys. New materials synthesised in this work are lead based composites reinforced with small amount of ceramic in order to improve mechanical properties by ODS technology, starting from powder metallurgy. Several methods have been used to obtain powder: the first one is the mixing of commercial powders specially prepared, the second one is the evaporation under an arc plasma and the third one uses the reduction of lead salts in organic solvent. Hardness values are more stable and reached two times the one of reference alloy. In the same time, secondary creep rates are divided until four comparing to the reference. Nevertheless, corrosion resistance is poor due to porosity and large part of grain boundaries which conduct to grain removal during the experiment.In order to improve this chemical resistance, lead layers are electrodeposed from fluoborates bath. In the same way, fine layers of silica obtained by PECVD improve corrosion behaviour of Pb-Ca-Sn alloy
Kacem, Imen. "Textiles à activité biologique via le greffage par plasma et l’immobilisation de molécules bioactives". Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10020/document.
Texto completoThe interest in medical implants increases and their use spreads to different surgical domains partially thanks to the new techniques of surface modification. Therefore it is possible to improve the biomaterials properties in order to solve the problems liked with their integration in the living tissues and thereby to prevent the various complications related to their use. This approach allows to respond to the surgeons expectations, to improve the curing process of the patients and even to involve long term therapeutic activities to the biomaterial, thus preventing the release of the disease (such as thrombosis, restenosis, infection). In this context, we have attempted the functionalization of the surface of a polyester fabric (polyethylene terephtalate), widely used in medical field, by three bioactive molecules: lysozyme, gentamicin and heparin known for their antimicrobial or anti thrombotic properties. The concept was to graft polyacrylic acid (PAA) by graft polymerization induced by cold plasma technique, followed by the immobilization of the above mentioned molecules through physical and covalent links. We studied all the experimental parameters involved in the different processes and followed the properties of the obtained materials through the appropriate characterizations techniques, such as spectrophotometry UV, Infrared analysis IRTF, Thermogravimetric analysis (TGA), X-ray Photoelectron Spectroscopy (XPS), goniometry, scanning electron microscope (SEM), and mechanical tests. Finally, biological studies such as cell vitality tests, platelets adhesion test and coagulation test in addition with various microbiological essays showed the evolution of the biological properties of the materials, depending on the path of their modification resulted in the development of a novel, biocompatible functionalized supports family with very interesting and attractive efficacy for biomedical applications
Bucaille, Nicolas. "Synthèse de dérivés linéaires et cycliques de l'acide cholique ; étude des propriétés physiques et de l'énantiosélectivité par chromatographie en phase gazeuse haute résolution". Rouen, 1998. http://www.theses.fr/1998ROUES099.
Texto completoPasquet, Cédric. "Disproportionation and ring-opening polymerization of silmethylene-siloxane derivatives". Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0072.
Texto completoPolysilmethylenesiloxanes are belonging to the “hybrid” silicone family. The presence of a methylene group into the polymer backbone enhances their thermal stability, which is particularly interesting in high-tech applications. The synthesis of such polymers by polycondensation did not so far lead to high molar mass polymers, contrary to those prepared by ring-opening polymerization. The synthesis of such polymers is described in this manuscript, from the monomer to the macromolecule. The silmethylene cyclic dimer, the monomer of interest, is synthesized by cyclization of 1,3-dichlorotetramethylsilmethylene. This latter can be generated from the disproportionation of the direct process residue, a by-product of the silicone industry. The disproportionation proceeds either by methylation with methyl lithium, or by Me/Cl interchange reaction catalyzed by AlCl3 in presence of tetramethylsilane. This latter led to a selective dechlorination of chlorosilanes and chlorosilmethylenes in mild conditions, which has not been yet observed with the DPR. Cationic ring-opening polymerization in presence of triflic acid of such silmethylene cyclic dimer led to bis-silanol polysilmethylenesiloxanes. Depending on the purity of monomer, high molar masses can be targeted. The reaction temperature also plays a critical role in order to avoid any cyclization of the growing chains. While triflic acid plays a role of catalyst, it does not allow controlling molar masses. Comparisons with conventional organic monomers were made to identify the polymerization mechanism which involves two propagating species in equilibrium, a silyl-oxonium ion and a silyltriflate ester. An increase of the reaction temperature shifts this equilibrium towards ionic species, responsible of back- and end-biting reactions. Thus the optimal reaction temperature of ROP of the silmethylene cyclic dimer has been set at 25°C previously and confirmed here. The ROP reaction of the silmethylene cyclic dimer in presence of triflic acid and silanol molecule allows designing the obtained molar masses, while keeping a certain control of end-groups. Variations of molar masses with the silanol content speaks for a polymerization occurring through an activated monomer mechanism. Experiments done to confirm this mechanism open routes to the polymerization of other cyclosiloxanes where the competition between the activated chain end (ACE) and the activated monomer (AM) mechanisms could be controlled
Vaton-Chanvrier, Laurence. "Synthèse et greffage sur silice de dérivés de l'acide cholique. Evaluation de l'énantiosélectivité par chromatographie liquide haute performance". Rouen, 1999. http://www.theses.fr/1999ROUES078.
Texto completoAkbar, Samina. "Régulation de l'expression hépatique de récepteur LSR (lipolys stimulated lipoprotein receptor) : rôles de l'acide docosahexaénoïque et du récepteur PPARa ( peroxisome proliferator-activated receptor alpha)". Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0288/document.
Texto completoLipolysis stimulated lipoprotein receptor (LSR) plays an important role in the clearance of ApoB/ApoE containing triglyceride-rich lipoproteins during postprandial phase. In this study, we demonstrated that in vitro treatment of mouse hepatoma cells, Hepa 1-6, with docosahexaenoic acid (DHA) led to an increase in LSR protein levels as well as its activity. Furthermore, the mice placed on the diet supplemented with DHA showed an increase in hepatic LSR protein. However, the mRNA levels remained unchanged in both in vitro and in vivo studies, suggesting that DHA enrichment may result in changes in LSR microenvironment that could affect its anchorage at the surface of cell membrane. Specific peroxisome proliferator response elements were identified in the upstream region of human, mouse and rat lsr gene by in silico analysis. We therefore sought to determine the role of the transcription factor, peroxisome proliferator-activated receptor (PPAR[alpha]), in LSR regulation. In vitro pharmacological studies using PPAR[alpha]-selective agonist and antagonist agents demonstrated that PPAR[alpha] is indeed involved in the transcriptional regulation of LSR expression. Furthermore, qPCR array analysis revealed the downregulation of PPAR[alpha] and various genes involved in hepatic lipid metabolism in LSR+/- mice on standard and high-fat diets. In conclusion, these studies show that the hepatic LSR activity is controlled by dietary factors that can activate various pathways involved in regulating lipid homeostasis, therefore representing LSR as a potential target for either nutritional or therapeutic strategies towards the prevention or treatment of dyslipidemia
Aoukar, Manuela. "Dépôt de matériaux à changement de phase par PE-MOCVD à injection liquide pulsée pour des applications mémoires PCRAM". Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT075/document.
Texto completoPhase change random access memories PCRAM are based on the fast and reversible switch between the high resistive amorphous state and the low resistive crystalline state of a phase change material (PCM). These memories are considered to be one of the most promising candidates for the next generation of non volatile memories thanks to their unique set of features such as fast programming speed, multi-level storage capability, good endurance and high scalability. However, high power consumption during the RESET operation (IRESET) is the main challenge that PCRAM has to face in order to explode the non volatile memory market. In this context, it has been demonstrated that by integrating the phase change material (PCM) in high aspect ratio lithographic structures, the heating efficiency is improved leading to a reduced reset current. In order to fill such confined structures with the phase change material, a highly conformal deposition process is required. Therefore, a pulsed liquid injection Plasma Enhanced-Metal Organic Chemical Vapor Deposition process (PE-MOCVD) was developed in this work. First, amorphous and homogeneous GeTe films were deposited using the organometallic precursors TDMAGe and DIPTe as Ge and Te precursors. XPS measurements revealed a stoichiometric composition of GeTe but with high carbon contamination. Thus, one of the objectives of this work was to reduce the carbon contamination and to optimize the phase change properties of the deposited PCMs. The effect of deposition parameters such as plasma power, pressure and gas rate on the carbon contamination is then presented. By tuning and optimizing deposition parameters, GeTe films with carbon level as low at 2 at. % were obtained. Thereafter, homogeneous films of GeSbTe were deposited by injecting simultaneously the organometallic precursors TDMAGe, TDMASb and DiPTe in the plasma. A wide range of compositions was obtained by varying the injection and deposition operating parameters. Indeed, one of the main advantages of this process is the ability of varying films composition, which results in varying phase change characteristics of the deposited PCM. The impact of plasma parameters on the conformity of the process was also studied. It was shown that by adding a low frequency power component to the radio frequency power of the plasma, structures with high aspect ratio were successfully filled with the phase change material. Finally, electrical characterization of PCRAM test devices integrating phase change materials deposited by PE-MOCVD as active material have presented electrical properties similar to the ones obtained for materials deposited by conventional physical vapor deposition (PVD) process
Bassil, Joëlle. "Développement par procédés plasma de polymères conducteurs protoniques de type phosphonique pour piles à combustible". Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20029/document.
Texto completoThe proton exchange membrane is a key component in the PEMFC-type fuel cell; it plays a decisive role as electrolyte medium for proton transport and barrier to avoid the direct contact between fuel and oxygen. The Nafion® is one of the most extensively studied proton exchange membrane for PEMFC applications. However, it has a number of drawbacks that need to be overcome, especially the poor performance at temperature above 80°C. That's why the development of effective and low cost membranes for fuel cell turned to be a challenge for the membrane community in the last years. Phosphonic acid derivatives are considered suitable candidates as ionomers for application in PEMFC at high temperature (> 80°C) thanks to their efficient proton transport properties under low humidity condition due to their amphoteric character.In this work, plasma polymers containing phosphonic acid groups have been successfully prepared using dimethyl allylphosphonate as a single precursor demonstrating the feasibility of plasma process for the manufacture of proton exchange membranes. Moreover, plasma polymers properties have been investigated as a function of the plasma conditions. The evolution of the films growth rate on three different supports as a function of the plasma discharge power is bimodal, with a maximum (close to 30 nm min-1 on Si) at 60 W. The chemical composition of plasma materials (investigated by FTIR, EDX and XPS) is quite homogeneous from the surface to the bulk; it is characterized by a wide variety of bond arrangements, in particular the presence of phosphonate and phosphonic acid groups which are above all concentrated in the plasma film synthesized at 60 W, characterized by the highest ion exchange capacity (4.65 meq g-1) and the highest proton conductivity (0.08 mS cm-1 at 90°C and 30% RH). TGA analysis has shown that phosphonic acid-based plasma polymers retain water and don't decompose up to 150 °C, which reveals a satisfying thermal stability for the fuel cell application. In terms of fuel retention, plasma films are intrinsically highly performing (methanol, ethanol and glycerol permeabilities being 40 to 235 lower than that of Nafion®211). The plasma films were deposited on fuel cell electrodes (E-TEK®) as binding agents. We have noticed that the phosphonic binder has a sufficient proton conductivity to allow proton transport at the electrode-membrane interface.A second part of this work concerns the surface treatment by plasma process of a conventional phosphonated membrane for improvement of thermal stability and fuel retention. TGA analysis has shown a slight improvement of the thermal stability for the treated membrane. Methanol and ethanol permeabilities tests show that the plasma-modified membrane is 2 to 4 times less permeable than the non-modified membrane. The treatment at 60 W shows the lowest fuel diffusion coefficients (DMeOH = 9.10-12 m2.s-1 and DEtOH = 6.10-12 m2.s-1). Fuel cell tests were realized showing better performance for the modified membrane compared to the non-modified one