Letteratura scientifica selezionata sul tema "Mousse (chimie) – Propriétés mécaniques"
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Articoli di riviste sul tema "Mousse (chimie) – Propriétés mécaniques":
BLIN, Capucine, Marcos OLIVEIRA, Christel CAUSSERAND, Yannick FAYOLLE e Vincent ROCHER. "Validation d’un protocole de vieillissement accéléré de membranes fibres creuses à l’échelle semi-industrielle". TSM 12 2023, TSM 12 2023 (20 dicembre 2023): 179–98. http://dx.doi.org/10.36904/tsm/202312179.
Tesi sul tema "Mousse (chimie) – Propriétés mécaniques":
Imbert, Claire. "Matériaux à propriétés mécaniques et thermiques améliorées sous pression hydrostatique en utilisation aquatique". Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20019.
Materials nowadays used for thermal insulation in aquatic environment under hydrostatic pressure are either rubber flexible foams or rigid foams, especially syntactic foams, depending on depth. These flexible materials were analyzed through classical mechanical and thermal tests. However, methods and results were adapted to the final usage of the product, particularly to the aquatic environment at the surface and under depth. Relationships between structures and properties characteristics were studied to define appropriate properties within relevant criteria. Moreover, to underline thermal properties under hydrostatic pressure, a testing instrument has been developed: an innovating hyperbaric test chamber, dedicated to under water pressure thermal resistance and thickness measurements, from 0 to 50 m depth. Strengths and weak points of these classical materials have been clearly established. Results analysis lead to a new concept of composite material for the defined usage. This innovating material, a syntactic foam, has been developed. By varying the particle type added to a thermoplastic elastomer matrix, the cellular structure has been refined in order to obtain a similar behaviour in aquatic environment, at the surface like in depth. This material has been tested, parallel to its industrial production, to identify relationships between structures and properties
Mechraoui, Ahmed. "Sandwich composite de mousses polymères". Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27452/27452.pdf.
The aim of this work is to produce and characterize polypropylene structural composite foams. To do so, the work is divided in three parts. The first part is devoted to study the reinforcement of polypropylene with hemp fibres by changing the fibre content, fibre size and coupling agent concentration. Micrographs are used to explain the results of the mechanical properties measured under tensile and flexural stress. It is found that 2% of coupling agent gives the optimum modulus values. In the second part, polypropylene foams are produced by compression moulding with different concentrations of blowing agent to determine the effect of density reduction and density profile on the tensile and flexural properties. The morphological characteristics (cell size, cell density and skin thickness) of the foams are also examined. It is found that the use of the complete density profile is necessary to predict with high precision the mechanical results. Finally, sandwich structures are produced with different skin ratio and core densities. A complete morphological analysis is reported with mechanical properties (tensile and flexural). It is shown that the simple law of mixture and the square power-law combined with the density profile are enough to predict the effect of the skins and core, respectively.
Yao, Jiaolian. "DENSITY GRADED LMDPE FOAMS PRODUCED UNDER A TEMPERATURE GRADIENT: MORPHOLOGY AND PROPERTIES". Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/28072/28072.pdf.
In this work, linear medium density polyethylene (LMDPE) and Expancel microbeads were used to produce density graded polymer foams using compression molding. By controlling independently the top and bottom plate temperatures in the mold, different temperatures and molding times were used to produce symmetric and asymmetric foams. The effect of blowing agent type and content were also studied to control the density profile and foam morphology (cell size and cell density) across thickness. Finally, the mechanical behavior in flexion and tension is reported and discussed in relation with foam morphology and structure.
Chen, Xiao Yuan. "Mousses structurales asymétriques de polymères". Thesis, Université Laval, 2008. http://www.theses.ulaval.ca/2008/25085/25085.pdf.
Bégin, Mathieu. "Effet de la ligne de soudure sur le polypropylène renforcé de fibres de verre et moussé par injection". Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24849/24849.pdf.
Delgado, Sánchez Clara. "Nouvelles méthodes d’optimisation et de caractérisation de mousses à base de tanins pour l’isolation thermique du bâtiment". Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0246/document.
In this thesis, foams based on more than 90% of natural products and with an exceptionally low thermal conductivity have been studied in depth. The main objective of this work was to improve some of the weaknesses of those materials and to solve problems that might be encountered during use, for allowing them to compete with other synthetic foams that are currently on the thermal insulation market. New methodologies have been proposed to optimise tannin-based foams from different points of view. First, liquid foams were analysed in terms of stability and polymerisation process using a backscattered light analyser, in order to convert them into improved rigid tannin-based foams. Experimental design was also used to improve the mechanical properties of physically blown rigid foams without prejudicing their thermal conductivity. On the other hand, hydrophobisation treatments were suggested for reducing the sensitivity of those foams to water in liquid or vapour form, and the effect of formulations’ ingredients on their fire properties were elucidated. Finally, two techniques of mechanical characterisation were investigated and compared, leading to Poisson’s coefficient and loss factor, and evidencing the precautions to be taken for characterising brittle foams
Dallagi, Heni. "Numerical and experimental investigations of the rheological behavior of foam flow : application to the cleaning of surfaces contaminated by microorganisms in the food industries". Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILR003.
In this research, experimental and numerical characterization of the rheological behavior of an aqueous foam flowing inside a horizontal pipe with and without singularities (presence of half-sudden expansion, and a fence) were investigated. Different conditions of foam flow were studied by varying the foam qualities (from 55% to 85%), and three Reynolds numbers (32, 65, and 97). Measurements of the pressure measurements, and at the wall the local velocity repartition and the thickness of the liquid films using respectively pressure sensors, Particle Image Velocimetry, and a conductimetry technique shown a reorganization of the foam downstream the geometry change, with a thicker liquid film at the duct bottom, larger bubble sizes at the top, as well as a larger foam void fraction increased from the bottom to the top part of the duct section. In addition, foam would present a visco-elastic character comparable to a non-Newtonian monophasic liquid. Computational Fluid Dynamics simulations were undertaken to predict this rheological behavior of the foam, the two models Herschel-Bulkley and Bingham were tested taken into account the presence of an underlying liquid film at the bottom of the channel . Comparison between experimental and numerical results showed that regardless of the foam quality, Herschel-Bulkley model could accurately describe the rheological behaviour of the aqueous foam under the different flow conditions analysed.The second target was to investigate the ability of a wet foam flow (quality of 50%) to clean stainless-steel surfaces contaminated by microorganisms. For this purpose, two different contamination patterns were studied, droplets containing Bacillus subtilis spores (either hydrophilic Bs PY79 or hydrophobic Bs PY79 spsA), and biofilms produced by three bacteria strains encountered in food industry production plants (Escherichia coli SS2, Bacillus cereus 98/4, and Pseudomonas fluorescens Pf1). Different flow conditions were performed by varying the wall shear stresses (2.2 - 13.2 Pa), and bubble sizes (0.18-0.34 mm) in a straight duct with no geometrical changes, in order to identify the mechanisms of contamination release and thus better control and optimize the foam cleaning process. Results show that compared to conventional cleaning-in-place, foam flow effectively removed Bs spores as well as Bc-98/4, Ec-SS2, and Pf1 biofilms. Moreover, the combination of high shear stress at the wall and small bubble sizes (<0.2 mm) showed promise for improving the cleaning efficiency of spores. On the other hand, a clear improvement of the biofilm removal was observed when increasing the mean wall shear stress. The characterization of the foam and the interface phenomenons (using polarography, conductimetry, and bubble size analysis methods) indicated that mechanisms such as fluctuation in local wall shear stresses, or in the liquid film thickness between the bubbles and the steel wall induced by bubble passage, foam imbibition, and sweeping of the contamination within the liquid film could participate largely to the removal mechanisms. Finally, the life cycle assessment study demonstrated that foam flow cleaning could be a suitable technique to reduce water and energy consumption (7 and 8 times less, respectively) presenting less environmental impacts than CIP processes, with about 70%. Lastly, foam flow cleaning can be an alternative method, which can improve efficiency and reduce environmental impact. Additional activities conducted during the PhD period related to hygienic design are presented highlighting the role of the contaminants (spores and biofilms), the material (other than stainless steel) and the geometry (ducts or more complex design) in hygiene monitoring
Han, Guobin. "Influence des propriétés rhéologiques de surface sur la morphologie et la dynamique des mousses bidimensionnelles". Poitiers, 1996. http://www.theses.fr/1996POIT2382.
Jaudouin, Olivier. "Physico-chimie de matériaux à base d'élastomères modifiés hyperélastiques". Thesis, Montpellier 2, 2012. http://www.biu-montpellier.fr/florabium/jsp/nnt.jsp?nnt=2012MON20036.
The aim of this PhD work is to replace current gloves of gloveboxes used in nuclear area by elastomer discs which could take the shape of the arm of an operator and come back to their original shape when the arm is removed. The goal of the work is to design and study a material meeting the following specifications: at least 2 000 % strain at break, very high elastic properties, tear and radiation resistant. A bibliographic study showed that the most relevant materials are thermoplastic elastomers. As a consequence, two kinds of these materials were formulated. First ones are thermoplastic polyurethane elastomers. The influence of stoichiometric ratios and different chain extenders on mechanical properties was studied. These materials are too viscous to match the specifications but an interesting linear relation between flow stress and viscosity ratio was observed. Second ones are Styrene-Ethylene-Butylene-Styrene copolymers (SEBS). Studies on the influence of the process and incorporation of plasticizers, nanoparticules or polyurethane were carried out. It was highlighted that the process strongly influences mechanical properties and addition of nanoparticules or polyurethane can increase some of these properties. On the whole, the materials developed are very close to these of hyperelastic materials
Breul, Thierry. "Etude de l'influence des variables de formulation sur les propriétés moussantes des systèmes liquides polyphasés". Toulouse, INPT, 1992. http://www.theses.fr/1992INPT005G.
Libri sul tema "Mousse (chimie) – Propriétés mécaniques":
Coussot, Philippe. Rhéophysique des pâtes et des suspensions. Les Ulis [Essonne]: EDP Sciences, 1999.
Haghi, A. K., G. E. Zaikov, Roman Joswik, Nikolai I. Vatin e Al Al Berlin. The chemistry and physics of engineering materials. Toronto: Apple Academic Press, 2016.
KUCHANOV, S. I. Free Radical Copolimerization Dispersions Glassy State Relaxation (Advances in Polymer Science). Springer, 1992.
DuFresne, Alain. Nanocellulose: From Nature to High Performance Tailored Materials. De Gruyter, Inc., 2012.
Joswik, Roman, Nikolai I. Vatin e Alexandr A. Berlin. Chemistry and Physics of Engineering Materials: Limitations, Properties, and Models. Apple Academic Press, Incorporated, 2018.
Berlin, Al Al, Roman Joswik e Nikolai I. Vatin. Chemistry and Physics of Engineering Materials. Taylor & Francis Group, 2021.
Berlin, Al Al, Roman Joswik e Nikolai I. Vatin. Chemistry and Physics of Engineering Materials. Taylor & Francis Group, 2021.
Joswik, Roman, Nikolai I. Vatin e Alexandr A. Berlin. Chemistry and Physics of Engineering Materials: Two Volume Set. Apple Academic Press, Incorporated, 2022.
Zaikov, G. E., A. K. Haghi, Al Al Berlin, Roman Joswik e Nikolai I. Vatin. Chemistry and Physics of Engineering Materials. Apple Academic Press, Incorporated, 2018.
Joswik, Roman, Nikolai I. Vatin e Alexandr A. Berlin. Chemistry and Physics of Engineering Materials: Limitations, Properties, and Models. Apple Academic Press, Incorporated, 2018.
Capitoli di libri sul tema "Mousse (chimie) – Propriétés mécaniques":
Fontanille, Michel, e Yves Gnanou. "12. Propriétés mécaniques générales des polymères". In Chimie et physico-chimie des polymères, 381–413. Dunod, 2014. http://dx.doi.org/10.3917/dunod.fonta.2014.01.0381.