Auswahl der wissenschaftlichen Literatur zum Thema „Réticulation ionique“
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Zeitschriftenartikel zum Thema "Réticulation ionique"
ANY- GRAH, Sandrine Armelle AKA, Nakognon Awa TUO-KOUASSI, Koffi Victor Kouakou, Kakwokpo Clémence N’GUESSAN-GNAMAN, Rosine Désirée N’KUITCHOU-CHOUGUO, Gnahoré José Arthur LIA, Alain N’GUESSAN, Ismael DALLY und Armand KOFFI. „Etude comparative de microparticules à base de pectine de Mangifera indica L. (Anacardiaceae) versus la pectine synthétique“. Journal Africain de Technologie Pharmaceutique et Biopharmacie (JATPB) 2, Nr. 3 (20.12.2023). http://dx.doi.org/10.57220/jatpb.v2i3.126.
Der volle Inhalt der QuelleDissertationen zum Thema "Réticulation ionique"
Narducci, Riccardo. „Membranes conductrices ioniques pour piles à combustible“. Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4764.
Der volle Inhalt der QuelleIn this thesis, perfluorosulfonic acid membranes (PFSA) and sulfonated aromatic polymers (SAP) are studied to better understandtheir thermodynamic, hydration, mechanical and electrical properties. The following main points were addressed:Regarding PFSA:1) Nafion membranes with various morphology and microstructure (amorphous, semi-crystalline, layered) were prepared and the relation to the properties, such as glass and melting transitions, and proton conductivity, was established.2) Various annealing treatments were performed and analyzed by the quantitative INCA (Ionomer nc Analysis) method using also special annealing agents. Regarding SAP:1) The in situ synthesis of cross-linked polymers was studied and the mechanism was clarified. 2) The degree of cross-linking was optimized for best proton conductivity.3) Cation-conducting ionomers were obtained by cation exchange of SPEEK and the properties of these new ionomers were determined
Patte-Boucrel, Valérie. „Propriétés physicochimiques de pectines, gélification par réticulation chimique et application à la gélification de milieux de culture“. Rouen, 1992. http://www.theses.fr/1992ROUES054.
Der volle Inhalt der QuelleYoung, Thomas. „Dépôts micro structurés pour la réalisation de capteurs d’activité hydrolytique“. Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILN062.
Der volle Inhalt der QuellePhytase, an enzyme capable of sequential hydrolysis of phytic acid to lower phosphorylated inositols and phosphate, has been increasingly added to animal diets to optimize phosphorus uptake by monogastric animals and to reduce its presence in faeces and soils. In this respect, the ability to measure its activity is obviously of primary interest. However, to date there are very few methods available to easily measure phytase activity in industry. The main reasons are that current techniques are time consuming, not suitable for complex feed samples and use hazardous reagents.In this thesis project, we proposed to develop an innovative enzymatic sensor dedicated to the detection of phytase activities in complex samples using a label-free approach thanks to Zymoptiq's technology. Phytic acid, the substrate of phytase, possesses numerous negative charges that can interact with positively charged polymers such as chitosan to form complexes. This phenomenon is well known and documented in the literature and is the cornerstone of our sensor. Our sensor is based on the degradation of micro deposits-based on a network structure of enzyme-insensitive chitosan chains cross-linked with phytic acid- when incubated in the presence of phytase activity (FTU/mL).However, to ensure the stability of the micro deposit, a systematic study was carried out to better control and understand all the underlying phenomena related to the complexes assembly. This also allows us to tailor our sensor's sensitivity. Through intermediate versions, we have demonstrated the ability to measure the activity of both a pure phytase sample of 100 FTU/mL and a simulated complex feed sample with activities as low as 20 mFTU/mL. Finally, after characterizing the hydrolysis mechanism of phytic acid complexed with chitosan by phytase, this study has enabled us to propose an innovative, safe and time-saving method of measurement
Jourdain, Antoine. „Nouvelles stratégies pour l’élaboration de polymères conducteurs ioniques fonctionnels à base 1,2,3-triazolium“. Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI115.
Der volle Inhalt der QuelleThis thesis proposes new strategies for synthesis of poly(ionic liquid)s based 1.2,3-triazolium (TPILs) involving two successive and orthogonal reactions of azide-alkyne cycloaddition catalyzed by copper (I) and N-alkylation of 1,2,3-triazole intermediates. This reaction sequence allows the development of ionic liquid monomers of a wide variety of structure and polymerizable functions, but also to chemically modify polymers quantitatively. Taking advantage of the chemistry benefits of 1.2,3-triazoliums, three new TPILs were developed by original synthesis methods. The first chapter proposes two new classes of linear TPILs developed using two distinct approaches. The first one consists of the AA + BB polymerization of a 1.2,3-triazolium synthetic diol monomer with four commercial diisocyants to obtain polyurethanes. The second one is the post-polymerization chemical modification of a neutral polysiloxane functionalized thiol by thiol-ene grafting of a 1.2.3-triazolium-based ionic liquid with a vinyl group. This first example of polysiloxane-based TPIL has remarkable ionic conductivity properties. The second chapter presents an exhaustive literature of the different synthesis pathways for the development of crosslinked poly(ionic liquid)s materials (PILs). This study is divided into three parts that distinguish the PILs networks obtained by chain growth polymerization, step growth polymerization and post-polymerization cross-linking. These materials are also differentiated according to their microstructure (dense, porous, gel membranes and colloid) and their applications (solid electrolytes, CO2 sorption and storage, catalysis, etc.). The third chapter proposes a new pathway to crosslinked PILs. It deals with the synthesis of an ionic liquid monomer diepoxy based 1.2,3-triazolium and then its homopolymerization by cationic ring opening polymerization. Polymerizing kinetics and physical properties of the network are compared to a structural analogue that does not have ionic liquid groups. This new strategy afforded materials with high ionic conductivity without the use of co-monomers
Laskowska, Anna. „Elastomer based composites filled with layered fillers and ionic liquids“. Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10281/document.
Der volle Inhalt der QuelleThis thesis focused on the preparation and the study of elastomer composites filled with layered fillers with improved mechanical properties, decreased swelling in solvents, increased UV stability and reduced gas permeability. The layered minerals were investigated not only in terms of their use as reinforcing fillers for rubbers but also as crosslinking agents, gas barrier and UV stability enhancers. The layered fillers tested belong to a class of cationic clays (natural and synthetic hectorite), anionic clays (hydrotalcites or magnesium aluminum layered double hydroxides MgAI-LDHs) and graphene-based materials. Different structural and surface properties of layered fillers were investigated as factors impacting the reinforcement of acrylonitrile-butadiene rubber (NBR) and carboxylated acrylonitrile-butadiene rubber (XNBR). Special attention has been devoted to the XNBR systems containing MgAI-LDHs varying in Mg / AI ratios, layers aspect ratios and particles morphologies. It was reported that the simultaneous application of MgAI-LDH as a filler and as a crosslinking agent in XNBR provides not only environmentally friendly, zinc-oxide free product but also ionic elastomer composite with improved mechanical, barrier and transparent properties. This thesis considers also the potential application of imidazolium ionic liquids as dispersing agents in rubber matrix, plasticizers and ionic conductivity enhancers. The optimal concentration and type of ionic liquids were selected for obtaining a good compromise between mechanical and conductivity properties of rubber composites
Piana, Giulia. „Electrolyte solide innovant à base de liquides ioniques pour micro-accumulateurs au lithium : réalisation par voie humide et caractérisation des propriétés de transport“. Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS359/document.
Der volle Inhalt der QuelleNew deposition techniques compatible with making tridimensional geometries are currently being investigated with the aim of improving the performances of lithium microbatteries. This work focuses on the development of a new quasi-solid electrolyte deposited by a “wet process”. An ionic liquid-based membrane containing a lithium salt was prepared by the photo-induced polymerization of a dimethacrylate oligomer. New methods such as a new type of conductivity cell based on planar interdigitated electrodes to measure ionic conductivity as well as in-situ monitoring of photo-polymerization using impedance spectroscopy were used. Transport properties of lithium ion were measured by PGSE-NMR. Interestingly, a significant reduction of lithium ion mobility was observed after UV-curing while the total ionic conductivity only decreased slightly. This phenomenon is due to the formation of lithium ion complexes with ethylene oxide moieties of the solid matrix, evidenced by Raman spectroscopy measurements. Additionally, we have shown that the structures of the complexes depend on the salt concentration and a dual solid/liquid transport mechanism was suggested. Hence, in order to improve lithium ion diffusion, a co-polymer was added in an attempt to decrease the cross-linking density of the solid matrix thus improving its segmental motion. The cyclability of the all solid state micro batteries was indeed improved. Comparable performances with the standard solid electrolyte LiPON were obtained at room temperature. In summary, it was established that electrochemical performances of the solid state microbatteries depend to a certain extent on the structure of the polymer electrolyte. Therefore it is possible to find new ways in designing these types of electrolytes for further improvement
Glinel, Karine. „Polysaccharides perfluorés dérivés de pullulane : synthèse et étude des propriétés en solution“. Rouen, 1999. http://www.theses.fr/1999ROUES009.
Der volle Inhalt der QuelleOuld, M'Bareck Chamekh. „Elaboration des membranes ioniques à base de poly (alcool vinylique), par formation d'un réseau semi-interpénétré. Réticulation par un agent gazeux“. Rouen, 1996. http://www.theses.fr/1996ROUES007.
Der volle Inhalt der QuelleRené, William. „Polymères à empreintes ioniques fluorescents : un outil innovant pour la détection du plomb en milieu marin“. Electronic Thesis or Diss., Toulon, 2019. http://www.theses.fr/2019TOUL0012.
Der volle Inhalt der QuelleIon imprinted polymers (IIP) are highly cross-linked porous materials with specific recognition cavities of a target ion. Thus, this kind of materials shows high selectivity. This work focuses on the preparation of fluorescent ion-imprinted polymers specific to lead (11), i.e. capable of transforming the ion recognition into a fluorescence signal, for the detection of this contaminant in marine environment. ln a first step, the strategy adopted was to select and synthesise a fluorescent ligand, specific to lead (11) and t study and use it for the preparation of the polymers. This ligand was modified to produce a styrene type fluorescent monomer (ANQ-ST). An exaltation of the fluorescence signal of ANQ-ST was observed along with lead Il addition. The second ste was dedicated to the develo ment of the lead Il ion-im rinted ol mers. Various parameters were tested: polymerization solvants, nature of crosslinking agent (EGDMA and DVB) and ANQ-ST/crosslinker ratio (2 % and 5% molar). A diversified panel of characterization techniques allowed to study the polymer structures and to evidence the integration of the functional monomer ANQ-ST inside the polymer matrix. The last step consisted in evaluating the performances of the IIPs for the detection of lead (Il) by fluorescence. The polymers prepared with EGDMA and 5 % of functional monomer showed the best results For these polymers, IIPs' fluorescence intensity in the presence of lead (11) was almost not impacted by the addition of interfering ion species, unlike their non-imprinted analogs. These results highlight the effectiveness of the imprinting effect. Calibration curves were established in aqueous media at different pH and in different matrices. Those parameters did not have major influences. The limits of detection obtained are below the World Health Organization recommendation (10 µg.L-1 ). These results were successfully validated by the detection of lead in natural samples, includinçi tests in marine media