Literatura científica selecionada sobre o tema "Composites polymères – Propriétés thermiques – Propriétés mécaniques"
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Artigos de revistas sobre o assunto "Composites polymères – Propriétés thermiques – Propriétés mécaniques":
Cordelle, Aurélie, Monssef Drissi-Habti e Aaron Forster. "Effets de l’irradiation aux UV sur les propriétés mécaniques des matériaux composites polymères". Revue des composites et des matériaux avancés 23, n.º 2 (31 de agosto de 2013): 295–309. http://dx.doi.org/10.3166/rcma.23.295-309.
Kerboua, B., EAA Bedia e M. Kotbi. "Impact des Propriétés Mécaniques, Géométriques et thermiques des matériaux sur les Contraintes d'Interface, des structures renforcées par composites." Afrique Science: Revue Internationale des Sciences et Technologie 4, n.º 2 (8 de novembro de 2010). http://dx.doi.org/10.4314/afsci.v4i2.61683.
Antonini, Thierry. "Contrôle automatisé de matériaux hétérogènes par imagerie TeraHertz". e-journal of nondestructive testing 28, n.º 9 (setembro de 2023). http://dx.doi.org/10.58286/28524.
Hidalgo, Emmanuel. "CONTRÔLES NON DESTRUCTIFS PAR TERAHERTZ DE REVETEMENTS DE FORTE EPAISSEUR ET DETECTION DE DEFAUTS AUX INTERFACES (CORROSION, DECOLLEMENTS, …)". e-journal of nondestructive testing 28, n.º 9 (setembro de 2023). http://dx.doi.org/10.58286/28461.
Khemis, Sabri Ben. "Mesure térahertz de faibles épaisseurs et détection de défauts aux interfaces pour les revêtements industriels : Avancées et applications". e-journal of nondestructive testing 28, n.º 9 (setembro de 2023). http://dx.doi.org/10.58286/28483.
Teses / dissertações sobre o assunto "Composites polymères – Propriétés thermiques – Propriétés mécaniques":
Fournier, Jérôme. "Contribution à l'étude des matériaux composites conducteurs à matrice époxyde : application à la non linéarité électrique". Lyon 1, 1997. http://www.theses.fr/1997LYO10336.
Sibold, Nathalie. "Elaboration et caractérisation de nanocomposites à base de polyéthylène et de montmorillonite". Caen, 2005. http://www.theses.fr/2005CAEN2011.
Chausson, Sophie. "Synthèse et utilisation de matériaux hybrides lamellaires pour l'élaboration et la caractérisation de nanocomposites polymères". Caen, 2009. http://www.theses.fr/2009CAEN2047.
The aim of this work is to elaborate original lamellar hybrid materials and disperse them in a polymer matrix to obtain nanocomposites. They have been prepared using two different matrixes, one apolar (polyethylene) and one polar (polyamide-12). The two lamellar hybrid systems have been dispersed in these matrixes and studied as part of the hybrid nature. The first one, the lamellar oxide KTiNbO5, has been chemically modified with alkylamines having different carbon chain lengths in order to be compatible with the different polymer matrixes. The dispersion of such materials has allowed improving several properties like thermal stability, mechanical resistance and fire resistance. The second family studied is the copper alkylphosphonate one. They have been prepared with different alkyl chain lengths. The aim of this study is to prepare a hybrid material with a transition metal and to disperse it in the polymer matrixes. A deep structural study of the homologue series has revealed two types of compounds: hydrated for the short alkyl chains (number of carbon atoms≤10) and dehydrated for the alkyl chains with n≥10. These two structural types have shown different magnetic behaviours. Finally, the incorporation of these fillers in polyethylene and polyamide-12 has revealed that the chemical nature of the bond which links the organic part to the inorganic one of the hybrid does not allow obtaining an efficient exfoliation mechanism
Rul, Alicia. "Compréhension et amélioration du nano-renforcement des élastomères silicone". Caen, 2011. http://www.theses.fr/2011CAEN2040.
Silicon rubbers exhibit very good thermal properties. Unfortunately, their mechanical properties are too weak and must be improved. Silica minerals are generally used to improve the silicon matrix properties via physical interactions. The aim of this work is to understand and improve the silicon rubbers physical behavior by using nanofillers. In depth studies of mechanical behavior and thermal degradation of silicon nanocomposites allowed us to well-understand reinforcement mechanisms. Thanks to hybrid organic/inorganic nanoparticles, we managed to increase the rubber’s crosslink density and to improve the dispersion of nanofillers in the matrix blends. Chemical modifications through hydrosilylation reaction and morphological modifications of these particles, allowed us to enhance significantly the thermal, mechanical and dynamic properties of silicon rubbers. In this work, we have found a new way of reinforcement by creating covalent bonds between tailored nanofillers and the silicon rubber matrix. This new way of reinforcement of silicon rubber properties allows simultaneously improving thermal behavior, reduce Payne effect, and increase elastic modulus
Borchani, Karama. "Développement d'un composite à base d'un polymère biodégradable et de fibres extraites de la plante d'Alfa". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSES010/document.
This study is a contribution to the search for new composite material from vegetable natural resources. It aims at the exploitation of natural fibers extracted from the Alfa plant with a bioplastic of the Mater-Bi® type in order to develop biocomposites. Three kinds of short fibers extracted from Alfa plant were prepared; untreated, 1% and 5% alkali treated. The various techniques used for fibers characterization showed an increase in the roughness, cellulose level, crystallinity index and thermal stability after the alkali treatment. The composite materials were prepared by twin screw extrusion flowed by an injection operation by varying the fiber contents of 0 to 25%. Thermal analysis showed significant increase of the crystallization rate with the incorporation of Alfa fibers and enhancement of thermal stability by alkali treatment. Modulus and tensile strength of biocomposites also improved whereas toughness and elongation at break decreased upon increasing the fibers fraction. Scanning electron microscopy (SEM) on fractured surfaces indicated good adhesion between the matrix and the treated or untreated Alfa fibers. The study of crystallization kinetics of biocomposites showed strong nucleating effect of treated or untreated Alfa fibers
Honoré, Mathilde. "Mise au point de nouveaux bio-composites verts innovants à base de roseau commun Phragmites australis : applications en plasturgie et en éco-construction pour le bâtiment". Thesis, Lorient, 2020. http://www.theses.fr/2020LORIS572.
The use of plant fibres, both in the field of plastics processing and in the building industry, makes it possible to reduce greenhouse gas emissions and therefore the environmental impact of mankind. Interest in biocomposites using plant fibres such as hemp, wood, flax and also miscanthus reed is increasing. Nowadays, there is very little work on the reed phragmites australis. However, as it does not use cultivated areas, this invasive plant is independent of agricultural issues and does not require any chemical inputs. The reed harvest is therefore part of a wetlands management approach while enhancing the value of a material with multiple properties. This work is devoted to the characterisation of the raw material phragmites australis and to the study of its eligibility as a substitute material of three reference materials, wood, miscanthus and hemp shiv, widely used as reinforcements in plastics processing and eco-construction. Composite formulations using two polymer matrices (polypropylene and polybutylene succinate) with different rates of plant fillers and coupling agent were characterised from the point of view of their mechanical properties by Charpy tensile, flexural and impact tests. The water ageing of these composites was also studied and correlated to the hydrophobic character of the reed. For the construction application, formulations based on reeds of different origins and using different binders (lime, plaster and earth) were tested in compression and with thermal conductivity measurements in order to evaluate the behaviour of the reed as a material for building use
Hamdi, Khalil. "Fonctionnalisation de matériaux composites à renfort carbone et matrice thermoplastique par adjonction de nanocharges : élaboration et étude du comportement". Thesis, Compiègne, 2017. http://www.theses.fr/2017COMP2388/document.
To extend the use of composites in more varied application (smart applications, multifunctional issues), one of the actual barrier is their poor electrical and thermal conductivities. In the case of carbon fiber reinforced composites, organic matrix are in charge of the insulating properties of the resulting composite. One of the solutions to enhance conductivities of materials is the use of conductive nanofillers. Improving the electrical and thermal properties of nanofilled polymers has been investigated in several studies. However, studiing the properties of continuous carbon fiber nano-filled composites is less approached. This work tends to fabricate and characterize carbon black and carbon nanotubes nano-filled composites. First of all, special interest was given to the delicate phase of manufacturing. As mentioned before, processing continuous fiber reinforced nanofilled polymers implies issues related to nanofillers agglomeration and inhomogeneous dispersion in the final composite. To resolve these problems, the choice of the thermoplastic (Polyamide6) matrix seemed preferable. In fact, the dispersion of nanofillers was made by twin screw extrusion which is known as one of the most effective agglomeration separation ways. Adding to this, the fabrication method based on Polyamide 6 shects called film stacking, ensure a homogeneous partition at the beginning of the process. SEM observations were performed to localize the nano-particles. It showed that particles penetrated on the fiber zone. In fact, by reaching the fiber zone, the nano-fillers created network connectivity between fibers which means an easy pathway for the current. It explains the noticed improvement of the electrical conductivity of the composites by adding carbon black and carbon nanotube. This test was performed with the 4 points electrical circuit. It shows that electrical conductivity of 'neat' matrix composite passed from 20S/cm to 80S/cm by adding 8wt% of carbon black and to 15S/cm by adding 18wt% of the same nano-filler. For carbon nanotubes, with '2.5wt% the conductivity was around 150S/cm. For the thermal properties, tests based on Joule's effect were performed. The rise of temperature was recorded using IR camera. Results obtained are in agreement with the electrical conductivity ones, showing enhancement of the thermal behavior in presence of nanofillers. Thanks to these results, the use of these composites as a damage-monitoring tool was possible. By the way, the electrical resistance change method was performed. Nanofilled materials showed better sensitivity to damage. Results were compared with classical damage monitoring tools. At the end, several 'smart' applications were tested such as graded functionalities composite and stitched nanofilled materials
Miranda, Campos Bernard. "Copolymer-based PLLA matrix composites produced by TP-RTM". Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILR042.
The present study experimentally investigated the production of poly(L-lactide)-based matrix composites by Thermoplastic Resin Transfer Molding (TP-RTM). In this process, the in-situ ring opening polymerization of L-lactide (L-LA) and ε-caprolactone (ε-CL) was performed in a single step to achieve composites with a biodegradable poly(L-lactide-co-ε-caprolactone) (PLCL) matrix in one step synthesis. The incorporation of ε-CL in the matrix was aimed at reducing the brittleness of PLLA. The resulting PLCL matrix was reinforced with glass or carbon fabrics. Different L-LA / ε-CL molar ratios were tested, leading to the development of composites with various chemical, thermal, and mechanical properties. The TP-RTM parameters were optimized to produce composites with reduced voids. Subsequently, these composites were characterized to evaluate monomers conversions, molecular weights and thermal properties of the matrices, as long as the mechanical properties of the resulting composites. It was found that PLCL / glass fabric composites exhibit higher impact resistance compared to their PLLA-based counterparts. On the other hand, PLCL / carbon fabric composites display remarkable lightweight properties with high bending strength. The fractures of the composites after mechanical tests were studied to identify the failure type during these experiments. In a more sustainable approach, fully biodegradable PLLA / flax composites were produced using TP-RTM, and their chemical, thermal, and mechanical properties were also studied. Furthermore, the impact of accelerated aging, i.e under temperature and UV irradiation, was studied on all composites. After aging, a relationship between crystallinity, matrices molecular weights and bending properties was established
Bardash, Liubov. "Synthesis and investigation of nanostructured polymer composites based on heterocyclic esters and carbon nanotubes". Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10174/document.
The thesis relates to synthesis and investigation of nanostructured polymer composites based on oligomers of cyanate esters of bisphenol a (DCBA) or cyclic butylene terephthalate (CBT) and multiwalled carbon nanotubes (MWCNTS). Catalytic effect of mwcnts in process of DCBA polycyclotrimerization as well as in cbt polymerization has been observed. Significant increase in crystallization temperature of nanocomposites based on polybutylene terephthalate (cPBT) with adding of MWCNTS is observed. The effect of processing method of cpbt/mwcnts nanocomposites on its electrical properties has been found. It has been established that the additional heating of the samples (annealing) at temperatures above melting of cPBT leads to reagglomeration of MWCNTS in the system. It is established that reagglomeration of MWCNTS results in increase of conductivity values of nanocomposites due to formation of percolation pathways of MWCNTS through polymer matrix. In the case of polycyanurate matrix (PCN), it is found that addition of small mwcnts contents (0.03-0.06 weight percents) provides increasing tensile strength by 62-94 percents. It has been found that addition of even 0.01 weight percents of MWCNTS provides significant increase in storage modulus of cPBT matrix. This is explained by effective dispersing of small amount of the nanofiller during in situ synthesis of pcn or cpbt matrix that is confirmed by microscopy techniques. It has been established that the properties of the nanocomposites based on heterocyclic esters and MWCNTS can be varied from isolator to conductor and has low percolation thresholds (0.22 and 0.38 weight percents for cPBT and PCN nanocomposites respectively). The conductivity of samples is particularly stable on a very large range of temperature from 300 to 10 degrees Kelvin that make these materials perspective for practical applications in microelectronics, as parts of aircraft and space constructions
Blivi, Adoté Sitou. "Effet de taille dans les polymères nano-renforcés : caractérisation multi-échelles et modélisation". Thesis, Compiègne, 2018. http://www.theses.fr/2018COMP2431/document.
The work presented in this paper aims to highlight and to understand the size effect of nano-reinforcements on nanocomposite properties With an experimental approach. Nanocomposites of PMMA and silica particles With different sizes (15nm, 25nm, 60nm, 150nm and 500nm) and volume fractions (20/0, 4 0/0 and 60/0) were manufactured. Multiscale analysis (MET and DRX-WAXS) have shown that the characteristic parameters of the microstructure of nanocomposites vary With the size of the nanoparticles. Indeed, the decrease in the size of nanoparticles at a given volume fraction implies a decrease of the intermolecular distance. This decrease has induced a densification of the matrix and a decrease of the matrix chain mobility. Mechanical tests (tensile, DMA) have shown that the young (E) and the conservation (E') moduli of the nanocomposites increase With the decrease in the size of the nanoparticles With a constant volume fraction. And the increase of E l is kept when temperature growing. An increase in glass transition (Tg) and degradation temperature (Td) was also observed With the DSC, DMA and ATG tests. Experimental elastic properties of the nanocomposites were used to assess the relevance of size effect micromechanical models, particularly the Hashin-Shtrikman bounds With interface effects proposed by Brisard. The modeling has shown that to reproduce the experimental elastic moduli of nanocomposites, the elastic coefficients of the interface must be dependents on particle sizes. And the state of dispersion of particles must be taken into account
Livros sobre o assunto "Composites polymères – Propriétés thermiques – Propriétés mécaniques":
Nielsen, Lawrence E. Mechanical properties of polymers and composites. 2a ed. New York: M. Dekker, 1994.
Fakirov, Stoĭko. Nano- and micromechanics of polymer blends and composites. Cincinnati, Ohio: Hanser, 2009.
Menard, Kevin P. Dynamic Mechanical Analysis. London: Taylor and Francis, 2008.
Menard, Kevin P. Dynamic mechanical analysis: A practical introduction. Boca Raton, FL: CRC Press, 2008.
Campo, Alfredo. Selection of Polymeric Materials: How to Select Design Properties from Different Standards. Plastics Design Library, 2007.
Landel, Robert F., e Lawrence E. Nielsen. Mechanical Properties of Polymers and Composites. Taylor & Francis Group, 1993.
Landel, Robert F., e Lawrence E. Nielsen. Mechanical Properties of Polymers and Composites. Taylor & Francis Group, 1993.
Landel, Robert F., e Lawrence E. Nielsen. Mechanical Properties of Polymers and Composites. Taylor & Francis Group, 1993.
Menard, Kevin P. Dynamic Mechanical Analysis: A Practical Introduction. Taylor & Francis Group, 2008.
Menard, Kevin P., e Noah Menard. Dynamic Mechanical Analysis. Taylor & Francis Group, 2020.
Capítulos de livros sobre o assunto "Composites polymères – Propriétés thermiques – Propriétés mécaniques":
BEDOUI, Fahmi, Adoté Sitou BLIVI, Benhui FAN e Djimédo KONDO. "Effets de taille et propriétés physiques et mécaniques des polymères nanorenforcés". In Nanocomposites, 73–95. ISTE Group, 2021. http://dx.doi.org/10.51926/iste.9031.ch3.
DOUMENG, Marie, Karl DELBÉ, Florentin BERTHET, Olivier MARSAN, Jean DENAPE e France CHABERT. "Effets de taille et de nature des charges sur les propriétés thermiques et mécaniques des composites à matrice PEEK". In Nanocomposites, 97–146. ISTE Group, 2021. http://dx.doi.org/10.51926/iste.9031.ch4.