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Статті в журналах з теми "Mousses polyuréthane"
Royan, Lucille, Céline Daher, Nathalie Balcar, Gilles Barabant, and Agnès Lattuati-Derieux. "Conservation des mousses polyuréthane ester : consolidation par application de mélanges de polysiloxanes." Technè, no. 46 (December 1, 2018): 119–25. http://dx.doi.org/10.4000/techne.536.
Повний текст джерелаPotel, Jean-François, Jean-Pierre Franceschi, Christophe Javois, David Jones, Caroline Mouton, Abdelramane Sbihi, and Romain Seil. "Valeur mécanique d’une fixation fémorale suspendue en os spongieux de tendons ischio-jambiers : étude des propriétés mécaniques de la fixation AClip® 12 modèles porcins et 12 mousses rigides de polyuréthane." Revue de Chirurgie Orthopédique et Traumatologique 102, no. 8 (December 2016): S277. http://dx.doi.org/10.1016/j.rcot.2016.10.016.
Повний текст джерелаBoutevin, B., Y. Pietrasanta, J. Conan, and R. Vera. "Réalisation de mousses de polyuréthanne rigide pour revêtements ignifuges résistants à l'eau." European Polymer Journal 23, no. 4 (January 1987): 301–5. http://dx.doi.org/10.1016/0014-3057(87)90152-2.
Повний текст джерелаGonzalez, M., C. Litolf, and A. Cantineau. "Évaluation de l’exposition professionnelle aux isocyanates dans une entreprise de fabrication de mousses polyuréthanes avec biométrologie." Archives des Maladies Professionnelles et de l'Environnement 65, no. 2-3 (May 2004): 179–80. http://dx.doi.org/10.1016/s1775-8785(04)93227-4.
Повний текст джерелаPenven, E., P. Girardin, M. Vergne, I. Thaon, F. Aubin, and P. Humbert. "Dermatites de contact allergiques dues à une mousse polyuréthanne : à propos de six cas." Archives des Maladies Professionnelles et de l'Environnement 73, no. 3 (June 2012): 585. http://dx.doi.org/10.1016/j.admp.2012.03.695.
Повний текст джерелаPrudent, O. "Simulation numérique du confort de sièges d'automobiles : comportement mécanique 3D de mousses de polyuréthanne ; optimisation 2D d'un profil simplifié de siège." Mécanique & Industries 1, no. 5 (October 2000): 511–20. http://dx.doi.org/10.1016/s1296-2139(00)00103-2.
Повний текст джерелаDEPREZ, G., R. HAZEBROUCK, and A. SFAOUI. "ÉTUDE DE LA PROPAGATION DANS UNE TIGE CYLINDRIQUE DE MOUSSE DE POLYURÉTHANE ; MESURE DES COEFFICIENTS VISCOÉLASTIQUES DE LA MATRICE EN B.F." Le Journal de Physique Colloques 51, no. C3 (September 1990): C3–43—C3–52. http://dx.doi.org/10.1051/jphyscol:1990305.
Повний текст джерелаKANOUTÉ, Y., I. TRAORE, S. SANOGO, E. Aroudam,, and A. BA. "Optimisation du rendement et de la température d’un capteur solaire plan à eau par simulation." Journal de Physique de la SOAPHYS 2, no. 1a (February 12, 2021): C20A03–1—C20A03–8. http://dx.doi.org/10.46411/jpsoaphys.2020.01.03.
Повний текст джерелаKismi, M., and P. Mounanga. "Comparaison performantielle à court et à long termes de mortiers légers à base de déchets de mousse de polyuréthane rigide et de billes de polystyrène expansé." MATEC Web of Conferences 2 (2012): 01019. http://dx.doi.org/10.1051/matecconf/20120201019.
Повний текст джерелаBIKARD, Jérôme. "Fabrication des mousses en polyuréthane." Plastiques et composites, October 2009. http://dx.doi.org/10.51257/a-v1-am3714.
Повний текст джерелаДисертації з теми "Mousses polyuréthane"
Boukrim, Amale. "Mousses de polyuréthane à l’eau." Thesis, Pau, 2011. http://www.theses.fr/2011PAUU3033/document.
Повний текст джерелаBecause of their properties (low density, insulation, impact resistance. . . ), polymer foams are widely used. This work focused on polyurethane foams aims at : replacing physical blowing agents (CFCs, HFCs) by the carbon dioxide formed by the reaction of isocyanate and water & trapping a catalyst in the polyurethane network. The formation of water-blown polyurethane foams involves two reactions. The polymerization (or gelling) reaction which creates the polyurethane network. And the blowing reaction which generates carbon dioxide. A proper balance is required between the two reaction rates to obtain a foam with atisfactory properties. The kinetics of each reaction considered separately was studied. Thus, on one hand IRFT and rheology were used to study the kinetic of the polyurethane formation. Both linear and crosslinked polyurethane were studied. We showed the interest of using utanediol to control the structure of the linear polyurethane. The effect of temperature and nature and concentration of catalyst on the kinetics of polymersation was showed. Moreover, triethanolamine which contains amine groups ( catalyst) and hydroxyl groups (crosslinkingagent) was tested. One the other hand, an appartus was made to study the kinetic of the blowing reaction. We show that the following parameters : temperature, weight of the diisocyanate, nature and concentration of catalyst, have a relatively limited influence on the kinetics of release of carbon dioxide. A study of polyurethane foams based on a commercial fomulation showed that it is possible to replace the physical blowing agents by water
Saint-Michel, Fabrice. "De l'élaboration aux propriétés mécaniques de mousses polyuréthane composites." Grenoble INPG, 2004. http://www.theses.fr/2004INPG0026.
Повний текст джерелаPaget, Baptiste. "Étude du renforcement de mousses syntactiques à matrice polyuréthane." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1202.
Повний текст джерелаSyntactic foams synthesized from an elastomeric matrix and soft-shell microspheres have shown interesting acoustical properties. They open new perspectives for the manufacturing of stealthy submarines or ships, but the industrialization of such material is held back by their great compressibility: hydrostatic pressure tends to crush the microspheres, which leads to a loss of the damping properties. We are therefore interested in studying the reinforcement of syntactic foams with polyurethane matrix. Scientific literature being scarce on this subject, a reference syntactic foam has been synthesized in the laboratory to allow a better characterization of this material and its components. In particular, an innovative test of hydrostatic compression has been developed to characterize the behavior under pressure of the microspheres and foam. A model of the literature simulating the compression of syntactic foams has been used thanks to the material parameters collected; it allowed us to test the influence of various parameters on this compression. This model could also predict the characteristics of the components of a foam whose compressibility would meet a set of specifications. These different analyses have shown that the main parameter governing the compression of syntactic foams is the Young's modulus of the matrix. In addition, a compression reinforcement can only be obtained using a chemical reinforcement of the matrix; the presence of fillers (fibers, MWCNTs) does not bring significant changes
Talal, Cheikhalard. "Synthèse de polyuréthane macroazoamorceurs (PUMAI) et leur utilisation pour préparer des copolymères à blocs polyuréthane-b-polyvinyle : applications dans le domaine des adhésifs et matériaux composites." Lyon, INSA, 1997. http://www.theses.fr/1997ISALO111.
Повний текст джерелаIn this work, the synthesis of polyurethane macroazo initiators (PUMAI) based on 2,2' azobis (2-cyanopropanol) (ACP) was investigated for the synthesis of thermoplastic and thermoset block copolymers. The study of the structure and reactivity (radical initiation ability and condensation with Isocyanates) of ACP showed that this molecule is very useful for the elaboration of PUMAI. Before block copolymers elaboration, we have studied the two stages of PUMAI synthesis. This synthesis was possible in solution with stannous catalyst at low temperature. From PUMAI, poly(urethane-b-styrene) and poly(urethane-b-methyl methacrylate) were elaborated, fractwnated and characterized in both structural and mechanical point of view. PUMAIs were also used for cross linking of unsaturated polyesters/styrene resins. They are able to Imitate radical polymerization and to reduce shrinkage (in order to be used instead of some. Low shrink or low profile additives as polyvinyl acetate and some polyurethanes). They are linked by covalent bond to the poly( ester/styrene) ma tri x after cross linking with or without fillers (glass fibers). Ali analyses realized on block copolymers and composites "poly(ester/styrene/urethane)/glass fibers" have shown that the block efficiency of PUMAIs is about 50% and proved their interest m the block copolymers synthesis
Sabbahi, Abdelaziz. "Transfert de l'eau dans la mousse de polyuréthane à 80 et 100°C : modélisation et expérimentation." Saint-Etienne, 1993. http://www.theses.fr/1993STET4019.
Повний текст джерелаPellizzi, Eleonora. "Etude du vieillissement des mousses de polyuréthane ester et consolidation par les aminoalkylalkoxysilanes." Thesis, Evry-Val d'Essonne, 2012. http://www.theses.fr/2012EVRY0034/document.
Повний текст джерелаMuseum artifacts made of polyurethane foam are frequently affected by conservation issues mainly related to the loss of their mechanical properties. While effective polyurethane ether foam treatments already exist, no convenient consolidationtreatment exists for polyurethane ester foams. The possibility of a reinforcement effect expected to prevent the mechanical properties loss of new foams and the structure collapse of degraded foams has been evaluated. Two aminoalkylalcoxysilanes (AAAS), the 3-Aminopropylmethyldiethoxysilane and the N-(2-Aminoethyl)-3-aminopropylmethyldimethoxysilane, which gave promising results for consolidation of paper, have been tested on modern industrial flexible polyurethane ester foam samples. The behaviour of the reference polyuréthane foam to artificial aging hasbeen monitored and compared to naturally aged polyuréthane foams. Then, AAAS solutions at different concentrations have been applied, by immersion, on unaged and artificially aged polyurethane ester foam samples. Mechanical properties havebeen studied by Compression Force Deflection Test, which shows that after AAAS treatment the resistance of the foam to compression improves. The AAAS distribution in the thickness of the samples has been investigated by Fourier TransformInfrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). Magic angle spinning nuclear magnetic resonance (MAS NMR) has been used to confirm AAAS polymerization and to evaluate its average polymer chain length. The promising results obtained suggest that AAAS could be an efficient solution for the consolidation of polyurethane ester foam for both a preventive treatment and a restoration treatment
Thoinon, dit Boisson Catherine. "Mise au point de formulations hybrides polyester polyuréthane répondant aux spécifications actuelles du procédé SMC." Lyon, INSA, 1990. http://www.theses.fr/1990ISAL0039.
Повний текст джерела[The interest of these SMC formulations concerned the thickening reaction involving a hydroxyl terminated polyester resin and a diisocyanate. The results demonstrated the feasibility of isocyanate thickening of polyester resins : the viscosity rise was better controlled, reproducible and faster. The use of a short diol which is known to be a chain extender, with polyester resin and diisocyanate produced hard-segment sequences of various lengths. The average length depended on the polymerization conditions and the ratio of diol. It influenced the properties of the final material : in particular using a hight ratio of diol, good impact and profile surface results were obtained for industrial moulded parts. In order to understand the mechanisms of reaction during the viscosity rise, we have studied formulations using model resins. We demonstrated that the critical phenomena we observed, is the result of gellation. We suggested that gellation is due to a hydrogen bonding-type association of the polymer chains. At the early stage of gellation, phase separation by spinodal decomposition could take place occurring at a critical length of hard-segment sequences. Then gellation by percolation through hydrogen bonding followed in the polymer-rich region]
Le, Bail Jean-Baptiste. "Modélisation du comportement mécanique sous chargement d’une butée d’amortisseur en mousse de polyuréthane : vers une démarche de dimensionnement en fatigue." Electronic Thesis or Diss., Brest, École nationale supérieure de techniques avancées Bretagne, 2022. http://www.theses.fr/2022ENTA0003.
Повний текст джерелаPolyurethane foam jounce bumpers are widely used in the automotive industry. Their main function is to absorb vertical shocks to the wheels and contribute to the integrity of the vehicle suspension. The mechanical response of this type of parts implies to take into account different mechanisms, from the buckling of the walls of the part to the self-contact through the geometrical non-linearities. The current characterization of these polyurethane foam jounce bumpers in fatigue is currently limited to the customer’s specifications and to the tests predefined by him. The objective of this thesis is to carry out a complete experimental characterization of the mechanical behavior in order to identify an Hyperfoam type behavior law. This characterization is also based on imaging techniques, SEM and tomographic, in order to characterize the link between the microstructure and the mechanical behavior of the jounce bumper. This study should allow to define a global approach for the fatigue design of polyurethane foam jounce bumper
Duboeuf, Olivier. "Contribution à l'optimisation du confort dynamique de sièges automobiles par la compréhension des mousses de polyuréthane." Thesis, Mulhouse, 2017. http://www.theses.fr/2017MULH9758.
Повний текст джерелаThe improvement of comfort in the automotive industry is a major challenge for car manufacturers and suppliers. At the heart of these concerns is the base seat system, major interface between the occupant and the vehicle vibration environment. This dissertation deals with the study of the main car seat sub-component: polyurethane foam.A wide range of polyurethane foam samples have been molded for a design of experiments according to selected process parameters. Several experimental protocols were employed to determine their physical properties, mechanical quasi-static and dynamic characteristics. A new protocol and an innovative device have been designed to characterize the foam sample submitted to vibrations. Statistical and principal components analysis helped to highlight existing correlations between those properties.A rheological model, adapted to the application in an industrial context, was carried out. For this purpose, a comparative study of the performance of different models applied to various polyurethane foam samples was conducted.To extrapolate the results on foam samples to a complete seat, additional tests have been performed with different formulations in both quasi-static and dynamic studies.The analysis of process parameters, physical properties and quasi-static and dynamic behaviors allowed highlighting of the links between these different features. Thus, it becomes possible to design a foam pad with predicted properties and minimize the time to design a car seat
Gossiaux, Alexandre. "Comportement au feu de mousses polyuréthanes rigides : Approches systématiques." Electronic Thesis or Diss., Centrale Lille Institut, 2021. http://www.theses.fr/2021CLIL0021.
Повний текст джерелаA common awareness of environmental factors and more particularly of global warming makes it urgent to better control energy consumption. One solution is to reduce energy loss in building using new and efficient thermal insulation materials such as polymeric foams. Polyurethane (PUR) and polyisocyanurate (PIR) foams are very effective and competitive materials due to their low cost. However, these materials are extremely flammable due to their organic nature. Researchers and manufacturers add molecules called flame retardants (FRs) to their composition in order to prevent the outbreak of a fire or reduce the intensity of combustion when a fire breaks out. The objective of this PhD work is to study by systematic approaches the fire behavior of PUR and PIR foams. The aim is to propose a scientific approach allowing a quicker and more efficient development of new formulations. This systematic study was also coupled with a multi-scale study of the fire behavior of the foams, as a laboratory-scale fire test was developed (M-SBI), which allowed a quick and efficient examination of the formulations. The FRs studied in this work are phosphorus organic FRs which are currently promoted to replace some halogenated FRs which could be dangerous for the environment and health. The mechanisms of degradation of virgin and flame retarded foams were elucidated using various analytical tools. Thus, in the case of phosphorus FRs, we were able to demonstrate that their mode of action varied according to the phosphorus oxidation degree as well as according to their point of decomposition. Moreover, the efficiency of the FRs also varies according to the foam used (PUR or PIR). All these results can thus advantageously be exploited to propose future efficient flame retardants for specific systems to reduce the combustion intensity of the foams
Книги з теми "Mousses polyuréthane"
Roberge, Brigitte. Diisocyanate-4,4' de diphébnylméthane (MDI): Pratiques de sécurité et concentration lors de pulvérisation de mousse polyuréthane : rapport. Montréal: Institut de recherche Robert-Sauvé en santé et en sécurité du travail, 2009.
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