Academic literature on the topic 'Composite polymère conducteur'
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Journal articles on the topic "Composite polymère conducteur"
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Hamouni, Mohammed, and Smaïn Khaldi. "Transition état conducteur/état isolant d'un polymère conducteur composite." Revue des composites et des matériaux avancés 15, no. 2 (August 23, 2005): 157–72. http://dx.doi.org/10.3166/rcma.15.157-172.
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Hanouni, Mohammed, and Smaïn Khaldi. "Application des polymères conducteurs composites au blindage électromagnétique Cas du polymère conducteur composite HDPE/PA-Ag." Revue des composites et des matériaux avancés 19, no. 2 (August 31, 2009): 201–13. http://dx.doi.org/10.3166/rcma.19.201-213.
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Dang, Zhi-Min, Jin-Kai Yuan, Jun-Wei Zha, Peng-Hao Hu, Dong-Rui Wang, and Zhong-Yang Cheng. "High-permittivity polymer nanocomposites: Influence of interface on dielectric properties." Journal of Advanced Dielectrics 03, no. 03 (July 2013): 1330004. http://dx.doi.org/10.1142/s2010135x13300041.
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Flexible dielectric composites with high permittivity have been extensively studied due to their potential applications in high-density energy capacitors. In this review, effects of interface characteristics on the dielectric properties in the polymer-based nanocomposites with high permittivity are analyzed. The polymer-based dielectric composites are classified into two types: dielectric–dielectric (DD, ceramic particle-polymer) composites and conductor–dielectric (CD, conductive particle-polymer) composites. It is highly desirable for the dielectric–dielectric composites to exhibit high permittivity at low content of ceramic particles, which requires a remarkable interface interaction existing in the composite. For conductor–dielectric composites, a high permittivity can be achieved in composite with a small amount of conductor particle, but associated with a high loss. In this case, the interface between conductor and polymer with a good insulating characteristic is very important. Different methods can be used to modify the surface of ceramic/conductor particles before these particles are dispersed into polymers. The experimental results are summarized on how to design and make the desirable interface, and recent achievements in the development of these nanocomposites are presented. The challenges facing the fundamental understanding on the role of interface in high-permittivity polymer nanocomposites should be paid a more attention.
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André, A., P. Degobert, F. Epron-Cognet, F. Henry, and P. Michel. "Élaboration de composites « polymères/polymères conducteurs »." Journal de Chimie Physique 92 (1995): 875–78. http://dx.doi.org/10.1051/jcp/199592875.
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Yu, Zhengwei, Zhenqing Wang, Hao Li, Jianxin Teng, and Lidan Xu. "Shape Memory Epoxy Polymer (SMEP) Composite Mechanical Properties Enhanced by Introducing Graphene Oxide (GO) into the Matrix." Materials 12, no. 7 (April 3, 2019): 1107. http://dx.doi.org/10.3390/ma12071107.
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Shape memory epoxy polymer (SMEP) composite specimens with different graphene oxide (GO) contents were manufactured to study the effects of GO mass fractions on epoxy polymer composites. While ensuring the shape memory effect of SMEP, the addition of GO also remarkably strengthened the mechanical performance of the polymers. Analyses of the epoxy polymer composites’ thermal, mechanical, and shape memory performance were conducted through carrying out dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), and static tensile, three-point bending, impact, and shape memory tests. Moreover, the tensile fracture, bending fracture, and impact fracture interfaces of epoxy resin composites were examined with scanning electron microscopy. The final test results indicated that when the GO content was 0.8 wt %, SMEP composites had good shape memory performance and optimum thermal and mechanical performance.
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Wang, Xin-Tao, Yun-Long Chen, and Li Ma. "The manufacture and characterization of composite three-dimensional re-entrant auxetic cellular structures made from carbon fiber reinforced polymer." Journal of Composite Materials 52, no. 23 (March 14, 2018): 3265–73. http://dx.doi.org/10.1177/0021998318764021.
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In recent years, three-dimensional auxetic structures have attracted great interest. Generally, three-dimensional auxetic structures are of complicate geometries which make them difficult to fabricate, benefiting from the development of additive manufacturing technologies, many three-dimensional auxetic structures can be made from metals or polymers. However, to the authors' knowledge, the additive manufacturing technology of fiber reinforced polymer is not fully developed, and none three-dimensional auxetic structure made from fiber reinforced polymer has been reported before. To integrate the high specific stiffness, high specific strength, and light weight merits of high-performance fiber reinforced polymer composites into three-dimensional auxetic structures with unique properties, research on composite three-dimensional auxetic structures made from fiber reinforced polymer should be conducted. This paper presents the composite three-dimensional re-entrant auxetic structures made from carbon fiber reinforced polymer laminates using an interlocking assembly method. The auxetic nature of the composite structure has been verified by experimental testing and finite element simulations. Based on the finite element models, the dependences of the Poisson's ratio and effective compression modulus of the composite auxetic three-dimensional re-entrant structure on the re-entrant angle have been studied and compared to metal three-dimensional re-entrant structure. A comparative study of the Poisson's ratio and specific stiffness of carbon fiber reinforced polymer composite auxetic structure with the three-dimensional printed polymer and metal auxetic structures in literature has also been conducted.
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ZHANG, LIN, and Z. Y. CHENG. "DEVELOPMENT OF POLYMER-BASED 0–3 COMPOSITES WITH HIGH DIELECTRIC CONSTANT." Journal of Advanced Dielectrics 01, no. 04 (October 2011): 389–406. http://dx.doi.org/10.1142/s2010135x11000574.
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Composites have been extensively studied for dielectric and related applications. This is a review of polymer based 0–3 composites that exhibit a high dielectric constant. These composites are classified into two types: Dielectric–dielectric composite and conductor–dielectric composite. The physical principles and related models are presented with associated assumptions and approximations. In general, a dielectric–dielectric composite needs a higher concentration of the fillers to reach a high dielectric constant than a conductor–dielectric composite. The high dielectric constant observed in the conductor–dielectric composites is usually associated with a high dielectric loss and a low electric breakdown field. The experimental results are summarized to illustrate the principles for, and the achievements in, the development of these composites. The challenges facing the fundamental understanding and the further development of these composites for different applications are discussed.
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Henry, F., and JL Greffe. "Relation entre la « structure » et la conductivité complexe de composites polymère-polymère conducteur." Journal de Chimie Physique 92 (1995): 999–1004. http://dx.doi.org/10.1051/jcp/1995920999.
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Liu, Sheng, Reza Montazami, Yang Liu, Vaibhav Jain, Minren Lin, Xin Zhou, James R. Heflin, and Q. M. Zhang. "Influence of the conductor network composites on the electromechanical performance of ionic polymer conductor network composite actuators." Sensors and Actuators A: Physical 157, no. 2 (February 2010): 267–75. http://dx.doi.org/10.1016/j.sna.2009.11.022.
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Rao, Yang, Jireh Yue, and C. P. Wong. "Material Characterization of High Dielectric Constant Polymer–Ceramic Composite for Embedded Capacitor to RF Application." Active and Passive Electronic Components 25, no. 1 (2002): 123–29. http://dx.doi.org/10.1080/08827510211279.
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Embedded capacitor technology can improve electrical performance and reduce assembly cost compared with traditional discrete capacitor technology. Polymer–ceramic composites have been of great interest as embedded capacitor material because they combine the processability of polymers with the desired electrical properties of ceramics. A novel nano-structure polymer–ceramic composite with very high dielectric constant (εr∼150, a new record for the highest reportedεrvalue of nano-composite) has been developed in our previous work. RF application of embedded capacitors requires that insulating material have high dielectric constant at high frequency (GHz), low leakage current, high breakdown voltage and high reliability. A set of electrical tests have been conducted in this work to characterize the properties of the in house developed novel high dielectric constant polymer–ceramic nano-composite. Results show that this material has faily high dielectric constant in the RF range, low electrical leakage and high breakdown voltage. 85/85 TH aging test has been performed and it had shown this novel high K material has good reliability. An embedded capacitor prototype with capacitance density of35 nF/cm2has been manufactured using this nano-composite with spinning coating technology. This novel nano-composite can be used for the integral capacitors in the RF applications.
Dissertations / Theses on the topic "Composite polymère conducteur"
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Fraichard, Lucie. "Nanotalcs fonctionnalisés vers de nouveaux composites conducteurs." Toulouse 3, 2012. http://thesesups.ups-tlse.fr/2614/.
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L'élaboration de matériaux composites multifonctionnels est un sujet actuellement en plein essor en science des matériaux. Le challenge actuel consiste à combiner plusieurs propriétés, chimiques ou physiques, au sein du même matériau. Notre but s'inscrit dans cette thématique et vise à obtenir des charges minérales électriquement conductrices. Parce qu'il combine d'excellentes propriétés de renfort, le talc naturel est actuellement utilisé comme charge dans de nombreuses applications. Cependant, sa nature hydrophobe et inerte est une limitation pour certaines utilisations. Une alternative est d'obtenir par synthèse hydrothermale, des talcs synthétiques qui possèdent une grande pureté, une taille submicronique et qui contiennent une plus grande quantité de sites hydrophiles réactifs. Les talcs ont tout d'abord été modifiés chimiquement par deux procédés : la fonctionnalisation par des nanotubes de carbone et le greffage d'un polymère conducteur intrinsèque, le polypyrrole. Différentes analyses ont montré que la modification du talc naturel par des nanotubes de carbone donnait des charges minérales dont la conductivité électrique est de l'ordre de quelques S. M-1. Tandis que la seconde fonctionnalisation qui consiste à obtenir des hybrides talc-polypyrrole, permet d'obtenir des charges conductrices de l'ordre d'une centaine de S. M-1. L'étape suivante concerne l'élaboration des composites PEBD / talcs modifiés (synthétisées précédemment). L'objectif est d'obtenir des composites aux propriétés mécaniques améliorées et électriquement conducteurs. Les résultats indiquent un seuil de percolation des charges talc-polypyrrole de 20 %m et le module élastique des composites est multiplié par 2 et 4 pour respectivement les talcs naturels et synthétiques modifiés. Les charges ainsi obtenues sont multifonctionnelles car elles apportent des propriétés électriques tout en améliorant les propriétés mécaniques d'une matrice polymère thermoplastiqueElaboration of multifunctional composites is a subject currently booming in materials science. The aim is to combine the respective physical or chemical properties of two or more materials. Our purpose is to get multifunctional fillers with mechanical (reinforcement, lubricant, thermal insulation) and conductive properties. Because it combines these mechanical and lubricant properties, natural talc is currently used as filler, coating or dusting agent in paints, lubricants, plastics, cosmetics, pharmaceuticals and ceramics. However, its hydrophobic and inert nature is a limitation for certain uses which involved chemical reactions. That is why it is important to improve its surface properties. An alternative is to obtain by hydrothermal synthesis, a range of talc-like phyllosilicates with well-defined chemical composition, high purity, submicronic size and which contain a larger amount of hydrophilic sites. Natural talcs and talc-like phyllosilicates are modified with a conductive polymer, the polypyrrole and with carbon nanotubes to obtain conductive properties. The introduction of these conductive fillers in a low-density polyethylene matrix by extrusion has allowed us to demonstrate that the mechanical properties of the matrix are maintained and its conductive properties are quite improved. These composites may be used as sensors or antistatic parts
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Thevenot, Sylvain. "Caractérisation & modélisation numérique du comportement chémo-et thermo-résistif en sorption-désorption d'un Composite Polymère Conducteur." Lorient, 2012. http://www.theses.fr/2012LORIS253.
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L’objectif des travaux présentés dans cette thèse était d’améliorer la compréhension de la réponse électrique des senseurs CPC « chémo-résistif » par l’utilisation d’un système modèle tel que l’EEA-37% NPC, constitué d’une matrice élastomère thermoplastique chargée de nanoparticules de carbone. Des études réalisées avec des senseurs CPC en couche mince ont permis de valider le potentiel de détection de ces transducteurs et de qualifier les capacités barrière au toluène de matériaux nanocomposites isolants tels que le PA12-MMT, poly(amide 12) chargé de nanoplaquettes de montmorillonite. Une expérimentation spécifique a été mise en place afin d’étudier les phénomènes multi-physiques induits au sein d’un CPC sous forme de plaque plane exposé à un composé organique volatile (COV). Le suivi simultané de l’évolution de la masse, des températures, du volume et de la résistance a ainsi permis d’obtenir des résultats inédits destinés à valider les modèles développés par la suite. Des expérimentations spécifiques ont permis d’établir une corrélation mathématique entre la résistivité électrique et la teneur en vapeur organique. Le développement d’un modèle numérique 1D a permis une meilleure interprétation des temps de réponse et des amplitudes des variations mesurées pour la résistance électrique grâce à la visualisation des densités de courant dépendant des gradients de concentrationThe aim of this work is to improve the understanding of the electrical response of chemo-resistive CPC sensors. EEA-37% CNP was chosen as model system due to its thermoplastic elastomer matrix filled with carbon nanoparticles. In a first step, the use a thin CPC transducers has allowed to demonstrate their good sensing performances for the quantification of barrier effect towards toluene vapour diffusion of montmorillonite platelets filled poly(amide 12) films. A specific experiment was created to study multi-physics phenomena induced in a flat sheet of CPC exposed to a VOC. The simultaneous monitoring of the behaviour of mass, temperature, volume and resistance has produced innovative results to be used to validate the numerical models developed subsequently. Specific experiments established a mathematical relation between solvent concentration and electrical resistivity. The development of a one-dimensional numerical model was found useful to interpret time lags and amplitudes of resistance variations through the visualisation of current densities depending on concentration gradients
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Dessertenne, Estelle. "Matériaux solide conducteur thermodurcissable : Application aux plaques bipolaires pour pile à combustible." Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00808869.
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Parmi les nouvelles technologies pour l'énergie inscrites dans un contexte de développement durable, les piles à combustible à membrane échangeuse de protons (PEMFC) présentent des aspects séduisants. Toutefois, pour rendre cette technologie compatible avec une application à grande échelle, elle doit répondre à des exigences strictes en termes de coût, performance, et durabilité. Alors que les plaques bipolaires métalliques sont pénalisées par leur résistance à la corrosion et celles en graphite par leurs propriétés mécaniques et leur coût (dû aux phases d'usinage des canaux), les plaques bipolaires composites apparaissent attrayantes en raison de leurs propriétés et performances et de leur coût. Cette thèse s'inscrit dans ce cadre, en proposant un matériau composite à matrice organique de type époxy et charges conductrices de graphite. L'objectif de notre étude consiste à mettre au point un matériau thermodurcissable à base d'une formulation époxyde solide (permettant de contrôler sa chimie et plus particulièrement sa réactivité) fortement chargée en graphite. Deux formulations différentes sont étudiées. La première est à base de prépolymère époxy appelé DGEBA et de dicyandiamide (DDA) comme durcisseur. L'autre formulation étudiée est constituée de DGEBA et de durcisseur : le 3,3',4,4'-benzophénone dianhydride tétracarboxylique (BTDA). Ces deux formulations ont la particularité d'être très réactives à haute température (180-200°C) caractérisées par des temps de gel très courts (plus petit que 1min) afin d'avoir un temps de cycle de réticulation court pour une industrialisation de la fabrication. De plus, ces mêmes matrices ont montré une bonne stabilité chimique à température ambiante ainsi qu'une bonne stabilité thermique du système réticulé compatible avec la température d'utilisation des piles en fonctionnement. Concernant les réseaux composites résultant de la polymérisation DGEBA/BTDA et DGEBA/DDA, le module au plateau caoutchoutique est dominé par le taux de charge qui est très élevé (85%), celui-ci est ainsi très proche d'un réseau à l'autre et reste supérieur à 1 GPa. Nous constatons une viscosité relativement élevée pour les systèmes fortement chargés, point à prendre en compte lors du procédé de transformation. Enfin, la dernière partie des travaux réalisés concerne l'étude de mélange constitué de la matrice thermodurcissable (DGEBA/DDA/urée) modifiée par un thermoplastique (PEI). L'originalité et l'intérêt de ce travail résident dans l'incorporation de charges conductrices afin que celles-ci puissent se disperser dans la phase continue ou co-continue époxyde-amine lors de la séparation de phase pour limiter la proportion de charges et ainsi la viscosité des systèmes chargés. L'autre intérêt est d'améliorer les propriétés de résistance à la rupture du réseau époxyde TD final grâce à la présence de la phase thermoplastique séparée.
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Bedel, Vincent. "Mise en oeuvre et optimisation d'un revêtement conducteur poly(époxy) : fils submicroniques d'argent pour la protection foudre de structures aéronautiques." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30144/document.
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Ce travail s'inscrit dans une problématique de mise en œuvre et d'étude d'un revêtement conducteur polymère extrinsèque pour la protection foudre des structures aéronautiques de type composite polymère renforcé fibres de carbone (CFRP). Le revêtement est composé d'une matrice poly(époxy) haute performance bi-composant fluide à température ambiante et de fils submicroniques d'argent à haut facteur de forme (AgNWs) obtenus par un procédé polyol. Une attention particulière a été portée à l'étude de l'influence des AgNWs sur la modification de la cinétique de réticulation du système, sa structure physique et sa mobilité moléculaire. La mesure des niveaux de conductivité volumique et surfacique du revêtement met en avant un seuil de percolation électrique pour un taux volumique en AgNWs inférieur à 1%. Une approche originale permettant la détermination des mécanismes de conduction a été effectuée au moyen des mesures de densités de courant imposées dans le revêtement en fonction du taux de charge en AgNWs et de la température. L'analyse du comportement électrique des échantillons aux valeurs critiques de densités de courant a permis d'appréhender les phénomènes responsables des mécanismes de dégradation. Enfin des essais foudres ont été effectués sur des substrats représentatifs d'une structure aéronautique avec différents types de protection foudre. L'analyse des échantillons par ultrasons après essais foudres a mis en avant l'efficacité du revêtement composite polymère conducteur poly(époxy)/AgNWs développé pour lutter contre le délaminage structurel du CFRPThis work deals with the processing and the study of an extrinsic conductive polymer coating for the lightning strike protection of the aircraft carbon fibre reinforced polymer (CFRP) structural parts. The coating consist in a low viscosity bi component high performance poly(epoxy) matrix and silver submicronic wires with a high aspect ratio (AgNWs) obtained by a polyol process. The kinetic parameters, the physical structure and the molecular mobility of the matrix had been investigated as a function of the filler content. The surface and bulk conductivities had been measured as a function of filler content. It exhibits a percolation threshold below 1% in volume. The conduction mechanisms had been studied following an uncommon method of current density measurement as a function of the AgNWs content and the temperature. The critical electrical behaviour of each sample had been investigated through the current density method. It has permitted to understand the phenomenon responsible for the composite's degradation. Finally, lightning strike tests on representative configurations had been carried out. The ultrasonic inspections have highlighted the efficiency of the poly(epoxy)/AgNWs coating to avoid the structural delamination of the CFRP
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Noël, Vincent. "Phénomènes de relaxation et réactivité interfaciale d' électrodes modifiées par un film de poly (3,4-éthylénedioxythiophène) électropolymérisé." Paris 7, 2002. http://www.theses.fr/2002PA077218.
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Gloaguen, François. "Etude et développement de plaques composites bipolaires pour piles à combustible." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00961189.
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Cette thèse a pour but de contribuer à la mise au point et le développement, de plaques mono ou bipolaires composites pour piles à combustibles à membranes échangeuses de protons (ou PEMFC). Les plaques mono ou bipolaires (selon le type de refroidissement choisi) sont un élément essentiel au fonctionnement des piles car elles l'alimentent en gaz réactifs (hydrogène et oxygène de l'air), assurent la tenue mécanique des cellules, la séparation des compartiments anodique et cathodique, le collectage des électrons, et l'évacuation des " sous-produits " eau et chaleur. L'optimisation des propriétés physico-chimiques et mécaniques des plaques, et de leur procédé d'élaboration, permettra de rendre de ce fait la technologie pile à combustible plus accessible Après une étude bibliographique centrée sur les systèmes composites à taux de charges ou de renforts élevé et leurs propriétés physicochimiques, mécaniques et électriques, la 2ème phase sera axée sur une contribution à l'optimisation des formulations par des analyses morphologiques, physiques et physicochimiques pertinentes. La 3ème phase sera dédiée à l'analyse des plaques mono ou bipolaires après tests en piles afin de permettre des choix entre les différentes formulations ou procédés de mise en œuvre des plaques mono et bipolaires et dégager des paramètres pertinents reliés aux propriétés d'usage et à leur évolution au cours du temps en conditions réelles d'utilisation.
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Gilormini, Pascal. "Contribution à la modélisation de la permittivité diélectrique de matériaux composites absorbants aux ondes hyperfréquences : lois de mélange, lois de changement d'échelle et équations du milieu effectif généralisé." Vandoeuvre-les-Nancy, INPL, 1995. http://docnum.univ-lorraine.fr/public/INPL_T_1995_GILORMINI_P.pdf.
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Cette étude est consacrée à la modélisation, par les lois de mélange, de la permittivité diélectrique de matériaux composites absorbants aux ondes hyperfréquences. Ces matériaux sont constitués d'inclusions conductrices (noir de carbone ou polymères conducteurs) dispersées dans une matrice polymère isolante. Leurs propriétés électromagnétiques dépendent fortement de la fraction volumique et de la répartition géométrique des charges au sein des matériaux, et notamment du phénomène de percolation. Les modèles basés sur la représentation géométrique asymétrique, présentés au premier chapitre, ne peuvent pas rendre compte d'un seuil de percolation différent de 0 ou de 1. Les modèles de milieu effectif, décrits au deuxième chapitre, constituent un important progrès dans la modélisation des données expérimentales, grâce à la représentation géométrique symétrique. Ils sont cependant mal adaptés au voisinage du seuil de percolation, car la percolation présente une forte analogie avec une transition de phase du second ordre. Le troisième chapitre développe cette analogie, et montre que les propriétés des composites au voisinage du seuil de percolation doivent être décrites par les lois de changement d'échelle. Les techniques pour abaisser le seuil de percolation sont présentées dans le quatrième chapitre. Enfin, le cinquième chapitre est consacré aux modèles récents de milieu effectif généralisé (GEM). Ces modèles combinent les lois de milieu effectif et les lois de changement d'échelle, et fournissent la meilleure modélisation des données expérimentales envisagées dans ce mémoire
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Nguyen, Tuan Anh. "Protection du fer par les polymères conducteurs polyaniline et composite (polyaniline - poly 1,5 - diaminonaphtalène) : électropolymérisation : étude du mécanisme de protection par les mesures électrochimiques locales." Paris 7, 2002. http://www.theses.fr/2002PA077131.
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Roncali, Jean. "Polymères organiques conducteurs fonctionnalisés." Paris 13, 1989. http://www.theses.fr/1989PA132014.
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Etude de la cinétique de la polymérisation électrolytique de dérivés du chiophène et amélioration de son efficacité et de sa sélectivité en vue d'obtenir la meilleure conductivité électrique possible; relation entre la conductivité et les propriétés spectroscopiques et électrochimiques des polymères. Modification des polythiophènes par voie électrochimique et greffage covalent de groupes fonctionnels sur le monomère; étude des facteurs stériques et électroniques associés aux differents substituants en vue de conserver les propriétés conductrices du polymère. Préparation électrochimique de polymères fonctionnels conducteurs aux propriétés de reconnaissance moléculaire
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Vanga, Bouanga Christele. "Elaboration et caractérisation de composites polymères conducteurs." Le Mans, 2010. http://cyberdoc.univ-lemans.fr/theses/2010/2010LEMA1015.pdf.
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Ce travail concerne l'élaboration et la caractérisation de matériaux composites conducteurs à base de polyaniline (PANI). Deux types de composites conducteurs ont été élaborés : les films composites conducteurs en surface et les composites conducteurs en volume sous forme de poudres. Ces composites sont obtenus par polymérisation in-situ d'aniline en présence de la matrice polymère. Les composites conducteurs en volume ont été préparés à base de poudre de polyamides (PA-11. PA-12) avec différents types d'acides à des pourcentages d'aniline allant de 0. 1% à 8%. Il a été montré que la conduclivité électrique croît avec l'augmentation du pourcentage de PANI. La méthode d'élaboration a permis d'obtenir un seuil de percolation particulièrement bas (0. 4%). Les composites conducteurs en surface ont été obtenus à partir des films de polyuréthane (PU) et de polyamide-6 (PA-6). L'étude de la cinétique de gonflement des films de PU et PA-6 dans l'aniline a montré que le degré maximum de gonflement pour ces films est de 25% et 16% d'aniline, respectivement. Afin d'étudier l'influence de la teneur de PANI sur les propriétés diélectriques et électriques, les films composites ont été préparés avec différents pourcentages d'aniline (0. 5 à 22%). Les mesures diélectriques effectuées en fonction de la température et de la fréquence ont montré que les propriétés des films composites sont proches de celles de la matrice polymère pure pour les faibles pourcentages de PANI (jusqu'à 1. 5% d'aniline). Au delà d'une teneur en aniline de 1. 5%, le dopage des films composites entraîne l'apparition de processus de relaxation de polarisation d'interface attribué à la structure double couche, mise en évidence par spectrométrie Raman, dont l'une contient des amas conducteurs de PANI. Les spectres diélectriques obtenus sont bien décrits par un modèle basé sur la théorie des milieux effectifs de Maxwell-Wagner-Hanai prenant en compte la structure double couche des films et la distribution de particules core-shell de PANI dans la couche composite. Un bon accord entre les données expérimentales et celles du modèle a été trouvé. Les systèmes composites conducteurs obtenus (composites en surface et en volume) grâce à leur valeur de conductivité (~ 10-3 S/cm) et leur capacité de changement de couleur en fonction de l'étal d'oxydation d'aniline peuvent être utilisés dans différents domainesThis work concerns the preparation and characterization of conducting composite materials based on polyaniline (PANI). Two types of conducting composite have been developed : the surface conducting composite films and bulk conductiing composites in powder form. The composites were obtained by in-situ polymerization of aniline in polymer matrix preliminarily swelled with monomer (aniline). The volume conducting composites based on PANI and polyamide (PA-11 and PA-12) were prepared with different types of acid and with aniline percentage ranging from 0. 1 wt. % to 8 wt. %. It was shown that the electrical conductivity of composite increases with increasing of the PANI percentage. It was found that such preparation method allowed obtaining the composites with low percolation threshold (0. 4 wt. %). The surface conducting composites were obtained for the polyurethane (PU) films and polyamide-6 (PA-6) films. The study of swelling kinetics of PU and PA-6 in aniline have showed that the maximum swelling degree for these films is 25 wt. % and 16 wt. % of aniline, respectively. In order to study the influence of the PANI content on the electrical and dielectric properties, the composite films were prepared with different percentages of aniline (from 0. 5 to 22 wt,%). The performed dielectric measurements as a function temperature and frequency have shown that the properties of the composite films are close to those of the pure polymer matrix for low percentages of PANI (up to 1,5 wt. %). For the composite films with aniline content higher than 1. 5 wt. % thé doping process leads to the appearance of the interfacial relaxation process assigned to the double layered composite structure. Indeed as it was found by Raman spectrometry the surface composite consists of two layers - one is the pure polymer matrix and the other one is the layer containing clusters of conducting PANI. The obtained dielectric spectra are well described by a model based on effective medium theory of Maxwell-Wagner-Hanai by taking into accout the double-layered structure of films and the distribution of core-shell particles of PANI in the composite layer. A good agreement between experimental data and those of the model was found. The obtained conducting composite Systems (surface and volume composites) due to their conductivity value (~10-3 S/cm) and to their ability to change color depending on the oxidation state of PANI can be used in gas sensors, as anticorrosion materials and anti-static coatings
Book chapters on the topic "Composite polymère conducteur"
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Khan, Imran, Weqar A. Siddiqui, Shahid P. Ansari, Shakeel khan, Mohammad Mujahid Ali khan, Anish Khan, and Salem A. Hamid. "Multifunctional Polymer-Dilute Magnetic Conductor and Bio-Devices." In Electrically Conductive Polymer and Polymer Composites, 31–46. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527807918.ch2.
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Siddiqui, Tauseef Uddin, and Mukul Shukla. "Modeling and Optimization of Abrasive Water Jet Cutting of Kevlar Fiber-Reinforced Polymer Composites." In Computational Methods for Optimizing Manufacturing Technology, 262–86. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0128-4.ch011.
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This chapter presents a detailed study of abrasive water jet (AWJ) cutting of thin and thick Kevlar fiber-reinforced polymer (FRP) composites used in transport aircraft and anti-ballistic applications. Kevlar composites are considered to be very challenging to machine using traditional techniques. Most of the research conducted in the area of AWJ cutting has been limited to single response optimization. However, in real life machining, the performance of a process/product demands multi-objective optimization (MOO). No work has been reported till now using different MOO techniques for AWJ cutting of Kevlar FRP composites. Experimental modeling of depth of cut and various design of experiments based single and multi-objective optimization studies are presented here. Statistical analysis of variance has been performed to rank the different process parameters and estimate their effects on various AWJ cut kerf quality characteristics. The studies conducted in this chapter are likely to prove beneficial to the AWJ community in performing modeling and simultaneous optimization of multiple quality characteristics.
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SHAHINPOOR, MOHSEN, and ARDESHIR GURAN. "IONIC POLYMER-CONDUCTOR COMPOSITES (IPCC) AS BIOMIMETIC SENSORS, ACTUATORS AND ARTIFICIAL MUSCLES." In Selected Topics in Structronics and Mechatronic Systems, 417–36. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812795526_0009.
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Tsutsumi, H., and Y. Hisha. "Hydroxyapatite-imidazole-polymer composite films as a proton conductor under no humidified condition." In 2007 Cleantech Conference and Trade Show Cleantech 2007, 207–10. CRC Press, 2019. http://dx.doi.org/10.1201/9780429187469-54.
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V., Arun K., Sujay Kumar D., and Murugesh M. C. "Drilling of Tio2 and Zns Filled Gfrp Composites." In Materials Science and Engineering, 978–90. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1798-6.ch039.
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The main affecting parameter for Delamination of the composites and in turn the failure of composites is the Thrust force. In the present work an attempt has been made in order to investigate the Thrust force generated during drilling of the TiO2 and ZnS filled Glass Fabric Reinforced Polymer Matrix Composites (GFRP). The volume fractions in the matrix were chosen as 1, 2 and3%. A plan of experiments, based on the techniques of Taguchi, was performed to acquire data in a controlled way. An L27 orthogonal array and analysis of variance (ANOVA) were employed to investigate the influence of process parameters on the drilling of these composites. Drilling has been conducted on a radial drilling machine. Speed of drilling (S), volume fractions (VF) and drill tool diameter (D) were considered as the varying parameters with three levels. Thrust force has been considered as the output parameter and is been measured in each combination of parameters chosen. Results reveal that, the addition of filler will increase the thrust force developed during drilling. As per ANOVA values, drill tool diameter contributes more towards generation of thrust, followed by speed of drilling. Main Effect plots shows that, contribution of speed towards thrust generation is only upto a certain level of increase in speed.
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Iwahori, Yutaka, and Takashi Ishikawa. "Overview of Polymer Composite Research Activities with Textile Reinforcements (Stitching and 3-D Fabric) Conducted in National Aerospace Laboratory of Japan." In Design, Manufacturing and Applications of Composites, 25–31. CRC Press, 2020. http://dx.doi.org/10.1201/9781003072089-6.
Full textConference papers on the topic "Composite polymère conducteur"
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Fard, Masoud Yekani, Brian Raji, and Aditi Chattopadhyay. "Fracture Mechanics Based Total Fatigue Life Behavior for Stitch-Bonded Polymer Matrix Composites." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64045.
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Stitch-bonded biaxial polymer matrix composite is a compromise between unidirectional composite and woven composite materials. In this paper, fatigue delamination behavior of stitch-bonded biaxial polymer matrix composites was investigated. The delamination growth rate in three domains of subcritical, linear, and unstable growth rate were studied. The effects of increased fracture resistance due to fiber bridging, multiple cracks, separation, and matrix cracking were considered in fatigue behavior of the composite. The fatigue onset life test was conducted to determine the threshold energy release rate. The total life delamination growth rate of stitch-bonded polymer matrix composites was characterized and presented.
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Ganguli, Sabyasachi, Ajit K. Roy, David Anderson, and Josh Wong. "Thermally Conductive Epoxy Nanocomposites." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43347.
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The quest for improvement of thermal conductivity in aerospace structures is gaining momentum. This is even more important as modern day aerospace structures are embedded with electronics which generate considerable amounts of heat energy. This generated heat if not dissipated might potentially affect the structural integrity of the composite structure. The use of polymer based composites in aerospace applications has also increased due to their obvious superior specific properties. But the thermal conductivity of the polymer matrix is very low and not suited for the design demands in aerospace applications. Several research studies have been conducted to improve the thermal conductivity of the polymeric composites. Different fillers have been used to improve the thermal conductivity of the polymeric matrix. Fillers may be in the form of fibers or in the form of particles uniformly distributed in the polymer matrix. The thermophysical properties of fiber filled composites are anisotropic, except for the very short, randomly distributed fibers, while the thermophysical properties of particle filled polymers are isotropic. Numerous studies have also been conducted in recent years where nanoparticles have been dispersed in the polymeric matrix to improve the thermal conductivity. Putman et al. [1] used the 3ω method to study the thermal conductivity of composites of nanoscale alumina particles in polymethylmethacrylate (PMMA) matrices in the temperature range 40 to 280 K. For 10% of 60 nm of alumina particle filler by weight (3.5% by volume) thermal conductivity of the composite slightly decreased at low temperatures. Whereas, above 100 K, thermal conductivity of the nanocomposite increased by 4% at room temperature. Kruger and Alam [2] studied the thermal conductivity of aligned, vapor grown carbon nanoscale fiber reinforced polypropylene composite. They measured thermal conductivity by laser flash instrument in the longitudinal and transverse directions for 9%, 17% and 23% fiber reinforcements by volume. The values of thermal conductivity as reported by them were 2.09, 2.75, 5.38 W/m.K for the longitudinal directions and 2.42, 2.47, 2.49 W/m-K for the transverse direction respectively, while the thermal conductivity of unfilled PP was 0.24 W/m-K. Exfoliated graphite platelets are another filler material of promise for improving the thermo-mechanical properties of the polymeric matrix. Aylsworth [3, 4] developed and proposed expanded graphite as reinforcement of polymers in 1910s. Lincoln and Claude [5] in 1980s proposed the dispersion of intercalated graphite in polymeric resins by conventional composite processing techniques. Since that time, research has been conducted on exfoliated graphite reinforced polymers using graphite particles of various dimensions and a wide range of polymers. Drzal et al. [6] have demonstrated the use of exfoliated graphite platelets to enhance the thermal and mechanical properties of polymeric resins. They concluded that composites made by in situ processing have better mechanical properties compared to composites made by melt-mixing or other ex situ fabrication methods due to better dispersion, prevention of agglomeration and stronger interactions between the reinforcement and the polymer. In the present study we use silver nano-filaments, nickel nano-filaments, alumina and exfoliated graphite platelets to enhance the thermal conductivity of an epoxy thermoset resin. The objective of this research is to identify the right filler to achieve the thermal conductivity as required by aerospace design engineers which is around 10 W/ m-K. An arbitrary filler loading of 8 wt% was chosen to compare the different fillers used in this study.
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Lee, Ka Yeung Terence, Hani Naguib, and Keryn Lian. "Flexible Multiwall Carbon Nano-Tubes/Conductive Polymer Composite Electrode for Supercapacitor Applications." In ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/smasis2014-7735.
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The present paper investigates three types of electrically conductive polymers (ECPs), namely polyaniline, polypyrrole and poly(3,4-ethylenedioxythiophene) PEDOT composite with multi-walled carbon nanotubes (CNTs) for supercapacitor applications. Their capacitive performance has been evaluated in both three electrodes half-cell and two electrodes cell setup. The nanocomposite were fabricated by polymerizing pseudocapacitive conductive polymer onto the MWCNT surface through the in-situ chemical polymerization approach. The composites were aimed to be optimized through varying the ECPs to MWCNT ratios. Half-cell electrochemical study was conducted to determine the optimal proportion of MWCNT and ECP in this parametric study. Two electrodes cell electrochemical study unveiled the potential device’s energy storage performance. MWCNT was found to act as the framework for the polymerization of the ECP into a tubular structure. Among the three composites, Ppy/MWCNT composite showed superior supercapacitor characteristics at scan rates of up to 500mV/s.
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Liu, Sheng, Minren Lin, and Qiming Zhang. "Extensional ionomeric polymer conductor composite actuators with ionic liquids." In The 15th International Symposium on: Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring, edited by Yoseph Bar-Cohen. SPIE, 2008. http://dx.doi.org/10.1117/12.787597.
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Samuel, Johnson, Ashutosh Dikshit, Richard E. DeVor, Shiv G. Kapoor, and K. Jimmy Hsia. "Effect of Carbon Nanotube (CNT) Loading on the Thermo-Mechanical Properties and the Machinability of CNT-Reinforced Polymer Composites." In ASME 2008 International Manufacturing Science and Engineering Conference collocated with the 3rd JSME/ASME International Conference on Materials and Processing. ASMEDC, 2008. http://dx.doi.org/10.1115/msec_icmp2008-72028.
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The machinability of carbon nanotube (CNT)-reinforced polymer composites is studied as a function of CNT loading, in light of the trends seen in their material properties. To this end, the thermo-mechanical properties of CNT composites with different loadings of CNTs are characterized. Micro endmilling experiments are also conducted on all the materials under investigation. Chip morphology, burr width, surface roughness and cutting forces are used as the machinability measures to compare the composites. For composites with lower loadings of CNTs (1.75% by weight), the visco-elastic/plastic deformation of the polymer phase plays a significant role during machining, whereas, at loadings ≥ 5% by weight, the CNT distribution and interface effects dictate the machining response of the composite. The ductile-to-brittle transition and reduction in fracture strength that occurs with an increase in CNT loading, results in reduced minimum chip thickness values, burr dimensions and cutting forces in the CNT composite. The increase in thermal conductivity with the increase in CNT loading, results in reduced number of adiabatic shear bands being observed on the chips and reduced thermal softening effects at high cutting velocities. Thus, overall the increase in CNT loading improves the machinability of the composite.
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Zantout, Alan, and Olesya I. Zhupanska. "Electrical Characterization of Carbon Fiber Polymer Matrix Composites." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10423.
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This paper studies the response of carbon fiber polymer matrix composites subjected to DC electric currents. We have developed a new fully instrumented experimental setup that enables one to measure electric field characteristics (amperage, voltage, resistance) and temperature at the surface of the electrified composites in real time. The experimental procedure ensured a low contact resistance between the composite and electrodes, high uniformity in the density of the applied electric current, and low resistance heating. An extensive experimental study on the electrical characterization of carbon fiber polymer composites of different composition, ply sequence, thickness, etc. was conducted. The effect of the resistance heating was carefully analyzed through experimental analysis as well as the finite element modeling.
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Ashari, A. A., and R. C. Tucker. "Thermal Spray Coatings for Fiber Reinforced Polymer Composites." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1255.
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Abstract Fiber reinforced polymer composites are an important class of structural materials. They possess high strength-to-weight ratios and high rigidities. However, for man ' applications heir wear resistance is less than desirable. Wear resistant thermal spray coatings can enhance the surface of these materials. Coatings on some composites have satisfactory adhesion without a bond coat, but others needed an appropriate bond coat. Polymer and o her bond coats have been used to enhance he adhesion of thermal spray coatings on composites. The present study was conducted to find one or more suitable bond coat materials. Materials such as polyamides, polyimides, polyether-etherketone or simply aluminum or nickel were found to be suitable bond coats for man ' different composite substrates.
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Tandon, G. P., T. Gibson, J. Shumaker, R. Coomer, J. Baur, and R. S. Justice. "Processing and Characterization of Novel Bismaleimide-Based Shape Memory Polymer Composites." In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-7936.
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In the present study, a series of novel linear polyaspartimide-based silane endcapped (cross-linked) polymers are synthesized using 4-4′ bismaleimidodiphenylmethane, Jeffamine D-400 (BMI-JA-400), and (3-Aminopropyl) trimethoxysilane. To add strength to these systems, the trimethoxysilane moiety is cross-linked with the addition of water to create a thermosetting material with both improved toughness and variable cross-link densities. Thermal analysis is done to evaluate the developed shape-memory polymer (SMP) resin for composite processing feasibility. The solvent content in the resin and thermal stability is monitored using thermogravimetric analysis (TGA) while advanced rheometric expansion system (ARES) with parallel plate geometry is used to measure viscosity variation with temperature. The resin BMI-JA-400-Si-70/30 is chosen for making the composite based on its viscosity, weight change, and kinetic results. Differential scanning calorimetry (DSC) is performed to determine the cure kinetics including the temperatures at which the cure reaction initiates and completes in order to develop the cure cycle for composite fabrication. The selected SMP resin is hand-impregnated with T-300 plain-weave and T-700 uni-weave carbon fabric. Six-ply composites are successfully fabricated with < 2% void content using both fabric weaves. The thermo-mechanical properties of the SMP resin are measured using dynamic mechanical analysis (DMA). In addition, the shape memory cycle with free recovery is conducted on the SMP resin and composites.
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Liu, Yang, Sheng Liu, Junhong Lin, Dong Wang, Vaibhav Jain, Reza Montazami, James R. Heflin, Jing Li, Louis Madsen, and Q. M. Zhang. "Transports of ionic liquids in ionic polymer conductor network composite actuators." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Yoseph Bar-Cohen. SPIE, 2010. http://dx.doi.org/10.1117/12.847618.
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Rohatgi, Aashish, James P. Thomas, M. A. Siddiq Qidwai, and William R. Pogue. "Performance Characterization of Multifunctional Structure-Battery Composites for Marine Applications." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67469.
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The aim of our work is to design, fabricate and characterize multifunctional structure-power composites for marine applications such as in unmanned underwater vehicles. Three types of structure-power (or structure-battery (SB)) specimens were fabricated using fiber-reinforced polymers and closed-cell foam as the structural components, and commercial-off-the-shelf lithium-polymer cells as the power-plus-structure component. This paper details the mechanical and electrical characterization of the S-B composites while a companion paper deals with the design and fabrication issues. The three multifunctional designs are: integrated SB laminate with lithium-polymer pouch cells embedded on one side, SB sandwich with cells embedded within a closed-cell polymeric foam along the neutral axis, and a SB modular stiffener that can be attached and removed from a host-structure. Unifunctional composites (i.e. without embedded cells) were also fabricated for comparison with the multifunctional composites. The embedded cells show identical charge-discharge electrical performance as their un-embedded counterparts, thus, indicating that the composite fabrication procedures did not adversely affect their electrical performance. Ragone curves (energy density vs. power density) of the S-B composites show that the targeted energy density of 50 Wh/L was achieved in the SB modular stiffener design. The bending stiffnesses of the integrated SB and SB modular stiffener designs were ∼7x greater than the unifunctional design while the multifunctional sandwich specimens were ∼17% stiffer than their unifunctional counterparts. Tests are currently being conducted to determine the affect of mechanical flexure (constant displacement) on embedded cell discharge and charge characteristics, and conversely, cell discharge and charge on the load and deflection during flexure.