Relevant bibliographies by topics / Urethanne polymere

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Urethanne polymere'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2024

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Journal articles on the topic "Urethanne polymere"

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Ferraro, Luiz Gustavo, Felipe Bastos de Souza Alvarenga, Maria Virginia Gelfuso, and Daniel Thomazini. "Investigation to Obtain Polyols from Residual Frying Oil." Materials Science Forum 775-776 (January 2014): 351–56. http://dx.doi.org/10.4028/www.scientific.net/msf.775-776.351.

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. Polymeric materials based on petroleum have generated a major problem for the environment because they are produced by non-renewable sources. Many studies are being conducted to propose alternatives to obtain polymers from renewable raw materials sources. The disadvantage of this alternative is the use of food sources for polymer production but this is avoided when using the residual frying oil. Aiming to obtain polymer-based urethanes, pretreated residual frying oil samples were submitted to various conditions of hydroxylation and analyzed by FT-IR, where it was possible to observe the presence of-OH groups. To optimize the process of hydroxylation a new research was conducted to determine the concentrations of formic acid and hydrogen peroxide that can generate polyols with high levels of hydroxylation index, suitable for the formation of urethanes.
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Didenko, Andrei, Danila Kuznetcov, Gleb Vaganov, Valentina Smirnova, Elena Popova, Alexey Ivanov, Boris Chernitsa, Valentin Svetlichnyi, Vladimir E. Yudin, and Vladislav Kudryavtsev. "The Thermal Stability and Mechanical Properties of Non-Segregating Blends of Polyimides with Copoly(Urethane-Imide)s." Key Engineering Materials 869 (October 2020): 280–95. http://dx.doi.org/10.4028/www.scientific.net/kem.869.280.

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The series of compositions containing thermodynamically incompatible flexible blocks of aliphatic polyesters and rigid blocks of aromatic bis (urethane) imides in the volume of polymers was obtained on the basis of multiblock (segmented) poly (urethane-imides) and related aromatic polyimides. The series includes segmented poly (urethane-imides) with different relative content of flexible and rigid blocks, non-segregating mixtures of poly (urethane-imides) and thermoplastic partially crystalline polyimide, statistical copolymers of poly (urethane-imide) with imide, and non-segregating mixtures of statistical copolymers with thermoplastic polyimide. The derived polymer systems were studied using thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical analysis. The deformation and strength properties of film samples are determined. It is shown that the properties of the studied polymers change as their content of imides blocks increases, and the transition from thermoplastic poly (urethane-imide) elastomers to thermoplastic polyimides is observed.
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KUZMENKO, S. M., E. O. SPORYAGIN, O. M. KUZMENKO, and A. YA PUZENKO. "SYNTHESIS AND PROPERTIES OF OLIGODIURETANEDIOLS BASED ON A MIXTURE OF (2,4–2,6) TOLUILENDIISOCYANATE." Polymer journal 43, no. 3 (September 20, 2021): 198–203. http://dx.doi.org/10.15407/polymerj.43.03.198.

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The paper describes the synthesis, the reaction of a mixture of isomers (2,4–2,6) of toluilendiisocyanate with a double molar excess of aliphatic individual or oligomeric diols, a number of previously unknown oligodiuretanediols and their physicochemical constants. It is shown that with an increase in the synthesis temperature from 50 to 70 °C, the reaction time to complete depletion in the mixture of free NCO-groups decreases from 8–9 hours to 3–4 hours. The reaction temperature of 70–2 °С should be considered optimal, because at higher temperatures side reactions of free NCO-groups with already formed urethane ones are possible. Because the presence of even a small amount of moisture in the diols can provoke side effects during the urethane formation reaction, all of the above diols were dried from the adsorbed moisture by azeotropic distillation with toluene before use in the reaction. Since the final products are even at the synthesis temperature (68–70 °C) viscous liquids, and there are difficulties with the homogenization of the reaction mass during synthesis, and when unloading the finished product from the reaction plant, in all cases, the synthesis was performed in solution cyclohexanone by 50 % by weight of the final product. Control of the reaction was performed by changing the % wt. free NCO-groups in time. The reaction was considered complete if the measured % wt. free NCO-groups in the reaction mixture for at least one hour twice showed zero. The isolated oligodiuretanediols range from solid at room temperature to very viscous products, which significantly depends on the molecular weight of the diol used in the reaction (ie the concentration of urethane groups formed). They are homogeneous, transparent compounds that are readily soluble in esters, ethers, aromatic and halide-containing, aprotic solvents, ketones, poorly or completely insoluble in aliphatic saturated hydrocarbons. The structure of the synthesized oligomeric products is confirmed by functional analysis, IR–spectra. In the IR-spectra of each of the synthesized oligodiuretanediols there are no absorption bands in the region of 2270 cm-1, which confirms the complete completion of the reaction of urethane formation according to the scheme. At the same time, the absorption bands in the region of 3450 cm-1, 1720 cm-1, 1540 cm-1 are fixed, which are characteristic of the presence of urethane groups in the structure of the target products. As the chain length of the diol component –R– increases in the target product (which synchronously leads to an increase in molecular weight), the intensity of these absorption bands decreases, which is associated with a decrease in the concentration of formed urethane groups in the structure of oligodiuretanediols. The refractive index also decreases synchronously. Synthesized series of oligodiuretanediols can be used for synthesis on its basis of other classes of oligomers with the simultaneous presence in the structure of urethane groups. The ability of such compounds to be soluble in solvents of different nature has been studied, which provides information for the directions of their further use (varnishes, enamels, primers).
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Jalal, Mahir A. "Synthesis and Evaluation of Urethane Polymers from PET Waste." Journal of Zankoy Sulaimani - Part A 17, no. 2 (January 25, 2015): 51–62. http://dx.doi.org/10.17656/jzs.10380.

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5

Laurano, Rossella, Monica Boffito, Claudio Cassino, Francesco Liberti, Gianluca Ciardelli, and Valeria Chiono. "Design of Injectable Bioartificial Hydrogels by Green Chemistry for Mini-Invasive Applications in the Biomedical or Aesthetic Medicine Fields." Gels 9, no. 1 (January 11, 2023): 59. http://dx.doi.org/10.3390/gels9010059.

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Bioartificial hydrogels are hydrophilic systems extensively studied for regenerative medicine due to the synergic combination of features of synthetic and natural polymers. Injectability is another crucial property for hydrogel mini-invasive administration. This work aimed at engineering injectable bioartificial in situ cross-linkable hydrogels by implementing green and eco-friendly approaches. Specifically, the versatile poly(ether urethane) (PEU) chemistry was exploited for the development of an amphiphilic PEU, while hyaluronic acid was selected as natural component. Both polymers were functionalized to expose thiol and catechol groups through green water-based carbodiimide-mediated grafting reactions. Functionalization was optimized to maximize grafting yield while preserving group functionality. Then, polymer miscibility was studied at the macro-, micro-, and nano-scale, suggesting the formation of hydrogen bonds among polymeric chains. All hydrogels could be injected through G21 and G18 needles in a wide temperature range (4–25 °C) and underwent sol-to-gel transition at 37 °C. The addition of an oxidizing agent to polymer solutions did not improve the gelation kinetics, while it negatively affected hydrogel stability in an aqueous environment, suggesting the occurrence of oxidation-triggered polymer degradation. In the future, the bioartificial hydrogels developed herein could find application in the biomedical and aesthetic medicine fields as injectable formulations for therapeutic agent delivery.
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Кулікова, І. О., Г. В. Міщенко, О. В. Міщенко, О. О. Венгер, and Т. А. Попович. "НАДАННЯ ПІДВИЩЕНОЇ ЗНОСОСТІЙКОСТІ ТКАНИНАМ ДЛЯ ЗАХИСНОГО ОДЯГУ." Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 128, no. 6 (April 9, 2019): 47–55. http://dx.doi.org/10.30857/1813-6796.2018.6.5.

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The purpose of the work is to increase the wear resistance of textile materials by forming composite polymer films on their surfaces. Methodology. The problem was solved by the use of a mixture of polymers and due to their ability to formulate composite polymer systems that combine the properties of individual polymers and exhibit new ones. One of them was used in the form of aqueous dispersion of the finished polymer of urethane type, and the second one was synthesized from pre-condensates of thermosetting resins (PTSR) in the process of finishing, namely, at the stage of heat treatment of the fabric after impregnation and drying, by providing conditions for the course of the condensation reaction.
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Didenko, A. L., A. G. Ivanov, V. E. Smirnova, G. V. Vaganov, E. N. Popova, D. A. Kuznetsov, L. A. Myagkova, V. M. Svetlichniy, V. E. Yudin, and V. V. Kudryavtsev. "Comparative characteristics of products of processing of fusible copoly (urethane-imides) from the solutions and melts formed by them." Plasticheskie massy, no. 9-10 (November 29, 2022): 20–24. http://dx.doi.org/10.35164/0554-2901-2022-9-10-20-24.

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Self-supporting films and thick-walled moldings (blades) were obtained from solutions and melts of multiblock (segmental) copoly(urethane-imides). The initial copoly(urethane-imides) were obtained on the basis of aliphatic polyesters: poly(propyleneglycol), poly(diethyleneglycoladipinate) and polycaprolactone, dianhydride of 1,3-bis(3’,4-dicarboxyphenoxy) benzene and aromatic diamines: 4,4’-bis-(4”-aminophenoxy)biphenyl and 1,4-bis(4’-aminophenoxy)diphenylsulfone. Samples of films and moldings were studied by IR spectroscopy, TGA, DSC and mechanical analysis under static and dynamic (DMA) experimental conditions. It is assumed that the diff erences in the properties of films and moldings are due to an increase in the proportion of aromatic blocks due to microdestruction of polymer chains and increased interfacial interactions of polyester and urethanimide microphases (blocks) in polymer systems during the processing of polymers from the melt by injection molding.
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Simioni, F., and M. Modesti. "Glycolysis of Flexible Polyurethane Foams." Cellular Polymers 12, no. 5 (September 1993): 337–48. http://dx.doi.org/10.1177/026248939301200501.

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Flexible water blown polyurethanes are polymers with repeating urethane and urea groups. When they undergo heating in the presence of glycols the reaction of these groups leads to soluble products. The transesterification reaction of the urethane groups, that leads to the formation of new carbamate is faster than that of the urea groups. Carbamates in turn undergo aminolysis due to the amines formed in the glycolysis of the urea groups. The use of ethylene glycol (EG) allows the process to be carried out with high polymer/glycol ratio (up to 4:1). A polyphase product is obtained with a top liquid phase mainly formed by the polyether polyol from the polymer, an intermediate liquid phase formed by the solution of carbamates, ureas and amines in EG and a bottom solid phase with compounds with prevalent urea bonds.
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Gonchar, Oleksii, YURI SAVELYEV, and ТAMARA TRAVINSKAYA. "Polyurethaneacrylate/montmorillonite nanocomposites." Polymer journal 43, no. 1 (March 9, 2021): 03–11. http://dx.doi.org/10.15407/polymerj.43.01.003.

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In order to create polymer nanocomposites with high performance on the basis of polyurethaneacrylates (PUA) with montmorillonite (MMT), three methods of chemical modification of the layered silicate surface have been developed. The first modification method is based on using of two different functional modifiers (organophilic and reactive), the second method is based on modification with synthesized by us compound which contains urethane groups, and the third one in based on using synthesized by us modifier containing urethane and other reactive groups. Exchange capacity of the MMT surface was determined by adsorption of indicator “methylene blue”. Intercalation of modifier into the interlayer space of MMT was confirmed by X-ray analysis; the content of organic component in the modified MMT (MMT/M) was determined by thermogravimetric analysis. The resulting organoclay is purposed for the formation of nanostructured composites based on cross-linked polyurethane acrylates with improved physical and mechanical properties. The obtained polyurethaneacrylate nanocomposites with different type MMT/M exhibit the increased in 1,6–2,6 times tensile strength as compared to original polymer matrix. WAXS method has proved an intercalation of modifier into MMT interlayer space (increased distance between layers after modification), as well as the total exfoliation of MMT in PUA matrix, characterized by the disappearance of the absorption peak which is responsible for layered structure.
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Aranberri, Ibon, Sarah Montes, Itxaso Azcune, Alaitz Rekondo, and Hans-Jürgen Grande. "Flexible Biocomposites with Enhanced Interfacial Compatibility Based on Keratin Fibers and Sulfur-Containing Poly(urea-urethane)s." Polymers 10, no. 10 (September 21, 2018): 1056. http://dx.doi.org/10.3390/polym10101056.

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Feathers are made of keratin, a fibrous protein with high content of disulfide-crosslinks and hydrogen-bonds. Feathers have been mainly used as reinforcing fiber in the preparation of biocomposites with a wide variety of polymers, also poly(urea-urethane)s. Surface compatibility between the keratin fiber and the matrix is crucial for having homogenous, high quality composites with superior mechanical properties. Poly(urea-urethane) type polymers are convenient for this purpose due to the presence of polar functionalities capable of forming hydrogen-bonds with keratin. Here, we demonstrate that the interfacial compatibility can be further enhanced by incorporating sulfur moieties in the polymer backbone that lead to new fiber-matrix interactions. We comparatively studied two analogous thermoplastic poly(urea-urethane) elastomers prepared starting from the same isocyanate-functionalized polyurethane prepolymer and two aromatic diamine chain extenders, bis(4-aminophenyl) disulfide (TPUU-SS) and the sulfur-free counterpart bis(4-aminophenyl) methane (TPUU). Then, biocomposites with high feather loadings (40, 50, 60 and 75 wt %) were prepared in a torque rheometer and hot-compressed into flexible sheets. Mechanical characterization showed that TPUU-SS based materials underwent higher improvement in mechanical properties than biocomposites made of the reference TPUU (up to 7.5-fold higher tensile strength compared to neat polymer versus 2.3-fold). Field Emission Scanning Electron Microscope (FESEM) images also provided evidence that fibers were completely embedded in the TPUU-SS matrix. Additionally, density, thermal stability, and water absorption of the biocomposites were thoroughly characterized.
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Dissertations / Theses on the topic "Urethanne polymere"

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Jin, Shu-Rong. "Cinetiques de formation de reseaux polymeres interpenetres a base de polyurethanne et de poly (methacrylate de methyle)." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13328.

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Etude par spectrometrie ftir. La reaction est probablement controlee par la vitesse de dissociation de l'amorceur. La polymerisation du mma est acceleree en presence du reseau polyurethanne. Le reseau elastomere peut etre considere comme "solvant" de viscosite infinie dans lequel on prepare le deuxieme reseau. Influence de la cinetique sur les proprietes dynamomecaniques
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Bardot, Anne. "Modélisation acoustique basses fréquences de cavités en présence d'absorbants sur parois rigides ou élastiques." Compiègne, 1992. http://www.theses.fr/1992COMP0424.

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Ces travaux concernent l'amélioration de la compréhension physique et la modélisation des phénomènes vibro-acoustiques de cavités en présence de matériaux absorbants en vue d'améliorer la modélisation vibro-acoustique d'un habitacle automobile pour des problèmes de bourdonnement [50-200Hz]. La caractérisation acoustique des matériaux absorbants, plus particulièrement des matériaux polyuréthanes est basée sur une procédure originale associant mesures et modèle de Biot pour caractériser l'impédance acoustique des matériaux en basses fréquences, sous l'incidence d'ondes planes normales ou obliques. La validation du modèle de Biot par les mesures directes en conduit (incidence normale) nous permet d'extrapoler les résultats sous l'incidence oblique dans l'hypothèse d'un matériau considéré isotrope. La modélisation acoustique des cavités a été réalisée à l'aide des méthodes par éléments finis de frontière. La prise en compte de ces matériaux passe par une notion originale "d'impédance acoustique modale" associée à la répartition spatiale du champ acoustique dans la cavité. Cette approche ne permet pas de définir le champ acoustique exact mais tient compte des variations d'impédance en se basant sur un modèle de boite parallélépipédique. La condition liùite des matériaux absorbants sur parois élastiques peut être représentée à l'aide d'un modèle associant vitesse de la paroi élastique et impédance acoustique du matériau sur fond rigide pour le problème spécifique des basses fréquences. La validation expérimentale du modèle a permis de comprendre les mécanismes de couplage fluide-structure mis en jeu. Ces premiers résultats contribuent à la modélisation acoustique de cavités et ouvrent des perspectives d'application pour le modèle acoustique d'habitacle en présence des matériaux d'habillage.
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Bardot, Anne. "Modélisation acoustique basses fréquences de cavités en présence d'absorbants sur parois rigides ou élastiques." Compiègne, 1992. http://www.theses.fr/1992COMPD424.

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Ces travaux concernent l'amélioration de la compréhension physique et la modélisation des phénomènes vibro-acoustiques de cavités en présence de matériaux absorbants en vue d'améliorer la modélisation vibro-acoustique d'un habitacle automobile pour des problèmes de bourdonnement [50-200Hz]. La caractérisation acoustique des matériaux absorbants, plus particulièrement des matériaux polyuréthanes est basée sur une procédure originale associant mesures et modèle de Biot pour caractériser l'impédance acoustique des matériaux en basses fréquences, sous l'incidence d'ondes planes normales ou obliques. La validation du modèle de Biot par les mesures directes en conduit (incidence normale) nous permet d'extrapoler les résultats sous l'incidence oblique dans l'hypothèse d'un matériau considéré isotrope. La modélisation acoustique des cavités a été réalisée à l'aide des méthodes par éléments finis de frontière. La prise en compte de ces matériaux passe par une notion originale "d'impédance acoustique modale" associée à la répartition spatiale du champ acoustique dans la cavité. Cette approche ne permet pas de définir le champ acoustique exact mais tient compte des variations d'impédance en se basant sur un modèle de boite parallélépipédique. La condition liùite des matériaux absorbants sur parois élastiques peut être représentée à l'aide d'un modèle associant vitesse de la paroi élastique et impédance acoustique du matériau sur fond rigide pour le problème spécifique des basses fréquences. La validation expérimentale du modèle a permis de comprendre les mécanismes de couplage fluide-structure mis en jeu. Ces premiers résultats contribuent à la modélisation acoustique de cavités et ouvrent des perspectives d'application pour le modèle acoustique d'habitacle en présence des matériaux d'habillage.
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Cobaj, Anisa. "The Effects of Urethane Methacrylates on the Film Properties of Acrylic-Urethane Hybrid Latexes." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1560335362557041.

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Gerard, Eric-Jack. "Synthese, caracterisation et comportement de polyurethannes hydrophiles : etude du mecanisme de la polycondensation reticulante." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13192.

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Synthese d'hygrogels, constitues de chaines elastiques de polydioxolanne. Les reticulats sont synthetises en milieu organique par couplages multiples des extremites hydroxylees, du polydioxolanne precurseur avec un compose isocyanate plurifonctionnel. Apres reaction, un echange progressif du solvant organique par l'eau permet d'obtenir les hydrogels
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Laguerre, Albert. "Oligomerisation et fonctionnalisation en serie methacrylique : greffage d'acides alpha amines." Le Mans, 1987. http://www.theses.fr/1987LEMA1017.

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Oligomerisation anionique du methacrylate de methyle. Modification des fonctions ester en fonctions plus reactions (alcool, chloroformiate, acide). Greffage d'aminoacides dont une seule fonction est libre pour eviter leur oligocondensation. Caracterisations des produits obtenus par rmn**(13)c, **(1)h et ir. Utilisation de ces produits pour la synthese de polyamides et de polyurethannes optiquement actifs
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François, Patrice. "Le fibrinogène : contribution dans l'infection sur corps étrangers." Paris 13, 1996. http://www.theses.fr/1996PA132032.

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Les staphylocoques reconnaissent certaines proteines plasmatiques adsorbees sur les biomateriaux grace a des recepteurs specifiques appeles adhesines, presents a leur surface. Nous avons etudie la composante d'adherence au fibrinogene de staphylococcus aureus (nommee clfa), qui jusqu'ici n'etait pas caracterisee. En collaboration avec un laboratoire de biologie moleculaire, nous avons selectionne des bacteries mutantes, incapables de former des amas en presence de fibrinogene soluble ou d'adherer au fibrinogene depose sur une surface. L'etude de ces mutants a permis de cloner et de sequencer le gene de l'adhesine du fibrinogene. Dans un circuit extra-corporel de circulation sanguine chez l'animal, nous avons determine que le fibrinogene depose sur les materiaux artificiels stimulait l'adherence bacterienne. Un modele d'endocardite experimentale chez le rat a revele que l'adhesine du fibrinogene favorise la colonisation des valves cardiaques par les staphylocoques. Deux strategies visant a reduire l'adherence ou la colonisation des catheters par les staphylocoques ont ete etudiees: (a) une modification de la surface des catheters en polyurethanne, par un traitement a la polyvinylpyrrolidone, reduisant la deposition des proteines plasmatiques sur les materiaux ; (b) l'impregnation des catheters par des agents antimicrobiens ayant un effet bactericide sur les bacteries adherentes. L'importance des resultats obtenus sur la caracterisation de l'adhesine de s. Aureus au fibrinogene et sa contribution, in vitro et in vivo, a l'attachement bacterien permet d'envisager des strategies anti-adhesives specifiques. Ces strategies pourraient devenir une precieuse alternative aux antibiotiques, surtout en presence de souches multiresistantes a ces composes
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Signoret, Christian. "Réseaux polyuréthannes classiques et contenant des motifs furanniques pour le confinement de déchets radioactifs : relations structure-propriétés." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0088.

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Etude des proprietes mecaniques, de la stabilite thermique de la diffusion de l'eau et de sels radioactifs dans des polyurethannes. Les polyetherurethannes souples ont un comportement moyen a la temperature et a la diffusion. Les polyesterurethannes ont un meilleur comportement mais sont hydrolyses rapidement les polyetherurethannes rigides (tv=20 a 40#oc) sont le meilleur compromis; amelioration de la tenue en temperature vers 350-500#oc par addition de derives furanniques
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Meng, Lei. "Investigation of non-isocyanate urethane functional latexes and carbon nanofiller/epoxy coatings." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1445733724.

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Clayton, Anthony Brian. "Photopolymerised urethane acrylates /." Title page, contents and summary only, 1992. http://web4.library.adelaide.edu.au/theses/09PH/09phc622.pdf.

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Books on the topic "Urethanne polymere"

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Frisch, Kurt C., and H. X. Xiao. Advances in Urethane Ionomers. CRC, 1995.

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New advances in the chemistry and technology of urethane and other isocyanate based polymers: [seminar]. Technomic Publ. Co., [distributor], 1989.

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Lstiburek, Joseph W., and Mark T. Bomberg. Spray Polyurethane Foam in External Envelopes of Buildings. Taylor & Francis Group, 2018.

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Spray Polyurethane Foam in External Envelopes of Buildings. Taylor & Francis Group, 2018.

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Lstiburek, Joseph W., and Mark T. Bomberg. Spray Polyurethane Foam in External Envelopes of Buildings. Taylor & Francis Group, 2018.

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Lstiburek, Joseph W., and Mark T. Bomberg. Spray Polyurethane Foam in External Envelopes of Buildings. Taylor & Francis Group, 2018.

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Book chapters on the topic "Urethanne polymere"

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Gooch, Jan W. "Urethane Polymers." In Encyclopedic Dictionary of Polymers, 785. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12399.

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Gooch, Jan W. "Urethane." In Encyclopedic Dictionary of Polymers, 784. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12394.

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Gooch, Jan W. "Thermoplastic Urethane." In Encyclopedic Dictionary of Polymers, 746. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11803.

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Gooch, Jan W. "Urethane Coating." In Encyclopedic Dictionary of Polymers, 785. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12395.

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Gooch, Jan W. "Urethane Foams." In Encyclopedic Dictionary of Polymers, 785. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12396.

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Gooch, Jan W. "Urethane Plastic." In Encyclopedic Dictionary of Polymers, 785. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12398.

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Gooch, Jan W. "Urethane Resins." In Encyclopedic Dictionary of Polymers, 785. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12400.

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Gooch, Jan W. "Urethane Thermoplastic Elastomers." In Encyclopedic Dictionary of Polymers, 785. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12401.

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Gooch, Jan W. "Coal Tar-Urethane Coating." In Encyclopedic Dictionary of Polymers, 149. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2492.

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Gooch, Jan W. "Urethane-Imide Modified Foam." In Encyclopedic Dictionary of Polymers, 785. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12397.

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Conference papers on the topic "Urethanne polymere"

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Beblo, Richard, and Lisa Mauck Weiland. "Polymer Chain Alignment in Shape Memory Polymer." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13703.

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Since their development, shape memory polymers, urethanes, styrenes, and the like, have been of increasing interest in advanced material and structure design. The following is an experimental investigation into the effect polymer chain alignment has on the mechanical properties of a particular styrene shape memory polymer, Veriflex®. Aligning the polymer chains results in several material anisotropies; giving rise to the possibility of controllable, directional shape memory and modulus behavior and a basis for a multitude of prospective design concepts.
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Squibb, Carson O., and Michael K. Philen. "Characterization of Honeycomb Polymer Composites for Use in Adaptable Aerospace Structures." In ASME 2017 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/smasis2017-3824.

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Smart materials are unique in their ability to change properties in response to an environmental stimulus. These materials provide promising opportunities for adaptable aerospace structures, where they can be altered to suit their need. In this research, Honeycomb Polymer Composites (HPCs) were investigated as potential materials for this need. HPCs are new materials that consist of a polymer embedded in a honeycomb structure, and exhibit a significantly higher stiffness than the polymer or honeycomb alone. This stiffness amplification is due to the nearly incompressible polymer resisting the volume change within the honeycomb cells. HPC samples were fabricated using an aramid honeycomb, with either silicone or urethane rubber as the matrix materials to fill the honeycomb. Varying polymer stiffness, honeycomb geometry, and testing temperature were all tested to observe the effects on the material properties. The results indicated that the HPCs could be effectively tailored and modeled to suit the need for different effective moduli. This research provides important insight and results in the development of programmable honeycomb polymer composites (PHPCs), which rely on shape memory polymers (SMP) as the internal working polymer.
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Wang, Jingyu, Shoieb Chowdhury, Yingtao Liu, Bradley Bohnstedt, and Chung-Hao Lee. "Development of Thermally-Activated Shape Memory Polymers and Nanocomposites for Biomedical Devices." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72500.

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Shape memory polymers (SMPs) have been developed as an emerging technology platform for biomedical applications in the past decades. In particular, SMPs are clinically essential for the development of novel medical devices to significantly improve long-term surgical outcomes. In this paper, we synthesized and characterized thermally-activated aliphatic urethane SMPs fabricated with nanocomposites for the design and development of biomedical devices. The thermal activation of shape memory function was investigated by direct thermal activation. Critical polymer properties, such as the glass transition temperature and shape memory function, have been tailored to desired applications, by adjusting the polymer composition. Carbon nanotubes were uniformly dispersed within the polymer during nanocomposite fabrication to significantly enhance the thermal and electrical properties. The synthesized SMPs and nanocomposites were characterized to understand their thermal and mechanical properties using dynamic mechanical analysis (DMA). Scanning electron microscopy was employed to evaluate the dispersion of carbon nanotubes in polymer matrix. The mechanical properties of SMPs and nanocomposites at temperature above their glass transition temperature were evaluated using dog-bone samples in a dual-column mechanical testing system and an environmental chamber. SMPs and nanocomposites will then be fabricated in the form of foam for the development of novel devices applicable to endovascular embolization of cerebral aneurysms.
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Bacardit, Anna, Silvia Sorolla, Concepcio Casas, Lluis Olle, and Mireia Conde. "Synthesis of polyurethanes with low volatile organic compounds content for upholstery and automotive articles." In The 8th International Conference on Advanced Materials and Systems. INCDTP - Leather and Footwear Research Institute (ICPI), Bucharest, Romania, 2020. http://dx.doi.org/10.24264/icams-2020.iii.1.

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The manufacture of upholstery and automotive articles is linked to the release of Volatile Organic Compounds (hereinafter VOCs) during their manufacture, which have short and long-term effects on the health of users and the environment. In the leather sector, around 40 kg of VOCs are generated per 1000 kg of raw skin. This research work has focused on the synthesis of new and more sustainable urethane-based polymers that, in turn, allow the quality requirements of the finish to be met, which vary depending on the leather article manufactured. The main objective of the study is to minimize the content of VOCs in the different aliphatic polyurethanes synthesized in a pilot-scale reactor, making small modifications to the synthesis formulations. The synthesis route developed is based on the preparation of polymers of ionomeric polyurethanes and their subsequent dispersion in water. In the synthesis processes developed, the content of coalescing solvents and neutralizing agents, which directly contribute to the concentration of VOCs of the urethane polymers, is eliminated and / or minimized as much as possible. The new urethane-based polymers obtained have been analyzed according to the parameters of pH, viscosity, density and percentage of solids in the resin. Likewise, organoleptic tests (color, transparency, hardness, touch and tacking) and physical tests (tensile strength, water absorption, hardness and color change at 100°C for 24 hours) have been carried out on the film corresponding to each synthesized polyurethane resin. These products will be introduced in finishing formulations designed to obtain high-performance upholstery and automotive leather with minimal impact in terms of VOC content at the pilot level. Tests of fastness and physical resistance have been carried out to evaluate the performance of these leathers.
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Tsutsumi, Naoto, Osamu Matsumoto, and Wataru Sakai. "Orientational Relaxation of NLO Dipole Moments Transversely Aligned to the Main Backbone in the Linear Polyurethane." In Organic Thin Films for Photonic Applications. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/otfa.1997.the.5.

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Recently, we have synthesized a new type of linear polyurethane (T-polymer) with NLO azobenzene chromophore whose dipole moment is aligned transverse to the main chain backbone and another linear urethane polymer (L-polymer) with NLO dipole chromophore incorporated in the main chain backbone.1 The resultant poled T-polymer shows the large second order nonlinearity of d33=1.6 × 10-7 esu (67 pm/V) with good thermal stability at the ambient conditions.1 This polymer is amorphous with a high density of NLO chromophore moiety and optically transparent thin film, which can be processed by spin-casting or solvent casting.
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Devaprakasam, D., P. V. Hatton, G. Moebus, and B. J. Inkson. "Nanomechanical and Nanotribological Properties of Nano- and Micro-Particle Filled Polymer Composites Used for Dental Restorative Applications." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44182.

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The objective of this work is to quantify nanomechanical and nanotribological properties of nano- and micro-particles filled polymer composites used for the dental restorative applications. Nanotribological performances of the two polymer composites with different reinforcing particulates were investigated using advanced microscopy techniques. Both the polymer composites composed of same dimethacrylate based monomeric mixture, Bisphenol-A-glycidyldimethacrylate (Bis-GMA), triethylene glycoldimethacrylate (TEGDMA), urethane dimethacrylate (UDMA), as matrix. It was found that the elastic modulus, hardness, particle size, shape, distribution and agglomeration significantly influence the friction and wear characteristics of the polymer composites. The results show that nanotribological performance of nanoparticle reinforced polymer composites is better than the microparticle reinforced polymer composites.
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Varacalle, D. J., D. P. Zeek, K. W. Couch, D. M. Benson, and S. M. Kirk. "Flame Spraying of Polymers." In ITSC 1997, edited by C. C. Berndt. ASM International, 1997. http://dx.doi.org/10.31399/asm.cp.itsc1997p0231.

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Abstract Statistical design-of-experiment studies of the thermal spraying of polymer powders are presented. Studies of the subsonic combustion (i.e., Flame) process were conducted in order to determine the quality and economics of polyester and urethane coatings. Thermally sprayed polymer coatings are of interest to several industries for anticorrosion applications, including the chemical, automotive, and aircraft industries. In this study, the coating design has been optimized for a site-specific application using Taguchi-type fractional-factorial experiments. Optimized coating designs are presented for the two powder systems. A substantial range of thermal processing conditions and their effect on the resultant polymer coatings is presented. The coatings were characterized by optical metallography, hardness testing, tensile testing, and compositional analysis. Characterization of the coatings yielded the thickness, bond strength, Knoop microhardness, roughness, deposition efficiency, and porosity. Confirmation testing was accomplished to verify the coating designs.
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Varacalle, D. J., K. W. Couch, and V. S. Budinger. "Studies of the Flame Spraying of Polymers." In ITSC 1996, edited by C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0251.

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Abstract Experimental studies of the subsonic combustion process have been conducted in order to determine the quality and economics of polyester, epoxy, urethane, and hybrid polyester-epoxy coatings. Thermally sprayed polymer coatings are of interest to several industries for anti-corrosion applications, including the infrastructural, chemical, automotive, and aircraft industries. Classical experiments were conducted, from which a substantial range of thermal processing conditions and their effect on the resultant coating were obtained. The coatings were characterized and evaluated by a number of techniques, including Knoop microhardness tests, optical metallography, image analysis, and bond strength. Characterization of the coatings yielded thickness, bond strength, hardness, and porosity.
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Crews, Joshua, Lokeswarappa R. Dharani, and Ashok Midha. "Fatigue and Failure Behavior of Homogeneous and Reinforced Compliant Mechanism Segments." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-86354.

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This paper presents a comprehensive study of the fatigue and failure behavior of both homogeneous and metallic-reinforced compliant segments. Baseline test results are presented for a homogeneous, fixed-free compliant segment constructed of thermoset urethane. The advantages of both polymeric and metallic materials for compliant mechanism construction are leveraged by designing and testing compliant test specimens containing a polymer casing and a metallic reinforcing element. Results obtained from fatigue testing of fixed-free compliant segments in a cyclic loading configuration show that the metallic-reinforced compliant specimens offer superior fatigue performance when compared to the homogeneous baseline specimens. Fractography, both macroscopic and microscopic, is used for a qualitative assessment of the failure behavior. This vein of research is undertaken using metallic reinforcement (inserts) toward the development of a new class of compliant mechanisms with significantly greater performance, particularly insofar as the problems of fatigue and creep are concerned.
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Menarbabzari, Mahsa Jafaie, and Ali Asghar Katbab. "Electrospun core-shell nanofibers based on thermoplastic urethane elastomer and gelatin: Evolution of cell behavior." In PROCEEDINGS OF PPS-32: The 32nd International Conference of the Polymer Processing Society - Conference Papers. Author(s), 2017. http://dx.doi.org/10.1063/1.5016740.

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