Relevant bibliographies by topics / Gas barrier properties

Academic literature on the topic 'Gas barrier properties'

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Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Gas barrier properties"

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Shirakura, Akira, Takanori Mori, and Tetsuya Suzuki. "Improvement of Gas Barrier Properties." Seikei-Kakou 27, no. 8 (July 20, 2015): 327–31. http://dx.doi.org/10.4325/seikeikakou.27.327.

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Cui, Yanbin, S. Kumar, Balakantha Rao Kona, and Daniel van Houcke. "Gas barrier properties of polymer/clay nanocomposites." RSC Advances 5, no. 78 (2015): 63669–90. http://dx.doi.org/10.1039/c5ra10333a.

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FROUNCHI, M., S. DADBIN, Z. SALEHPOUR, and M. NOFERESTI. "Gas barrier properties of PP/EPDM blend nanocomposites." Journal of Membrane Science 282, no. 1-2 (October 5, 2006): 142–48. http://dx.doi.org/10.1016/j.memsci.2006.05.016.

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Kalendova, Alena, Dagmar Merinska, Jean Francois Gerard, and Miroslav Slouf. "Polymer/clay nanocomposites and their gas barrier properties." Polymer Composites 34, no. 9 (June 13, 2013): 1418–24. http://dx.doi.org/10.1002/pc.22541.

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Salame, Morris. "Prediction of gas barrier properties of high polymers." Polymer Engineering and Science 26, no. 22 (December 1986): 1543–46. http://dx.doi.org/10.1002/pen.760262203.

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KURAOKA, Koji, Yuta SHIMMEN, Hidetoshi KATO, Hiroyasu SEKI, and Takeshi NISHIKAWA. "Preparation and gas barrier properties of organic–inorganic hybrid gas barrier membranes using 3-glycidoxypropyl silsesquioxane." Journal of the Ceramic Society of Japan 128, no. 4 (April 1, 2020): 229–32. http://dx.doi.org/10.2109/jcersj2.20004.

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Liu, Yiwu, Ao Tang, Jinghua Tan, Yuhui Li, Ding Wu, Xiang Zhang, Xianqing Zhao, Pan He, and Hailiang Zhang. "High-barrier polyimide containing fluorenol moiety: Gas barrier properties and molecular simulations." Reactive and Functional Polymers 157 (December 2020): 104747. http://dx.doi.org/10.1016/j.reactfunctpolym.2020.104747.

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Liu, Yiwu, Ao Tang, Jinghua Tan, Xianqing Zhao, Chengliang Chen, Ding Wu, Yuhui Li, Pan He, and Hailiang Zhang. "High-Barrier Polyimide Containing Carbazole Moiety: Synthesis, Gas Barrier Properties, and Molecular Simulations." Polymers 12, no. 9 (September 8, 2020): 2048. http://dx.doi.org/10.3390/polym12092048.

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A high-barrier polyimide (2,7-CPI) was synthesized through the polymerization of pyromellitic dianhydride (PMDA) and a novel diamine (2,7-CDA) containing carbazole moiety. The synthesized diamine and polyimide were fully characterized by elemental analyses, FTIR and NMR. The 2,7-CPI displays very attractive barrier performances, with oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) low to 0.14 cm3·m−2·day−1 and 0.05 g·m−2·day−1, respectively. Meanwhile, 2,7-CPI also exhibits exceptional thermal stability with a glass transition temperature (Tg) of 467 °C, 5% weight-loss temperature (Td5%) of 550 °C under N2 and coefficient of thermal expansion (CTE) of 3.4 ppm/K. The barrier performances of 2,7-CPI are compared with those of a structural analogue (2,7-CPPI) and a typical polyimide (Kapton). Their barrier performances with respect to microstructure were investigated by molecular simulations, wide angle X-ray diffraction (WAXD), and positron annihilation lifetime spectroscopy (PALS). The results show that 2,7-CPI possesses better coplanar structure and more number of intermolecular hydrogen bonds among the three PIs, which result in tight chain packing and thereby high crystallinity, low free volume, and decreased chains mobility. That is, the high crystallinity and low free volume of 2,7-CPI reduce the diffusion and solubility of gases. Meanwhile, the poor chains mobility further decreases the gases diffusion. The reduced diffusion and solubility of gases consequently promote the improvement of barrier properties for 2,7-CPI. The polyimide has a wide application prospect in the field of flexible electronic packaging industries.
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Takahashi, S., H. A. Goldberg, C. A. Feeney, D. P. Karim, M. Farrell, K. O'Leary, and D. R. Paul. "Gas barrier properties of butyl rubber/vermiculite nanocomposite coatings." Polymer 47, no. 9 (April 2006): 3083–93. http://dx.doi.org/10.1016/j.polymer.2006.02.077.

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NISHIURA, Katsunori. "Polymer-Inorganic Hybrid Coatings Having High Gas Barrier Properties." Kobunshi 56, no. 3 (2007): 139. http://dx.doi.org/10.1295/kobunshi.56.139.

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Dissertations / Theses on the topic "Gas barrier properties"

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Lamberstam, Philip. "Nanocellulose Based Films : Improved Mechanical And Gas Barrier Properties." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-107869.

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Microfibrillated cellulose (MFC) films have been prepared to demonstrate the potential of the material in order to see if it is a possibility to replace most parts of petroleum-based plastics. MFC is produced by mechanically delaminating the wood fiber cell wall into individual nano-fibrils. There are different ways to fabricate MFC at low energy consumption, thus keeping the cost down. The MFC films were produced using two different techniques; solvent-casting and by vacuum filtering, nanofiltration. The MFC films were characterized in terms of optical, mechanical and gas barrier properties. The results show that MFC (Generation 2) has superior mechanical properties and very promising oxygen barrier properties. MFC (Generation 2) has a more dense and homogenous nanocellulose film structure, thus very good oxygen permeability properties. These properties are good indications that MFC films have many suitable positive properties for use in e.g. the packaging industry. Incorporations of different components, such as nanoclays, latex or ionic crossed-linked improves the gas barrier properties for the MFC films.
Detta examensarbete handlar om filmer tillverkade av mikrofibrilär cellulosa (MFC). Syftet med studien var att se om det går att ersätta dagens petroleumbaserade plaster med MFC-filmer. Olika typer av MFC undersöktes, och detta gjordes genom olika tester av de mekaniska och optiska egenskaperna, samt en undersökning för att se permeabiliteten för syre genom MFC-filmer. MFC framställs genom att man mekaniskt bearbetar träfibrer och delaminerar på fibrillaggregaten som cellväggarna är delvis uppbyggda av. Det finns flera olika sätt att framställa MFC och hålla nere energikonsumtionen och därmed kostnaderna. Filmerna framställdes genom två olika sätt, det ena enklare genom att låta vattnet avdunsta i ett konditionerat rum, och den andra genom att vakuumfiltrera. Resultaten visar att typen, även kallad Generation 2, har bäst mekaniska egenskaper jämfört med alla andra generationer, samtidigt som den har bäst förmåga att motstå syrepermeabilitet. Generation 2 har en mer homogen filmstruktur, därav klarar den av att motstå permeabiliteten för syre. Behandlingen av olika preparat, så som nanoleror, latex och jonbyten kommer påverka egenskaperna för MFC filmerna.
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Bhatia, Amita, and abhatia78@yahoo com. "Experimental Study of Structure and Barrier Properties of Biodegradable Nanocomposites." RMIT University. Civil, Environmental and Chemical Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20090304.143545.

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As nanocomposites provide considerable improvements in material properties, scientists and engineers are focussing on biodegradable nanocomposites having superior material properties as well as degradability. This thesis has investigated the properties of biodegradable nanocomposites of the aliphatic thermoplastic polyester, poly (lactide acid) (PLA) and the synthetic biodegradable polyester, poly (butylene succinate) (PBS). To enhance the properties of this blend, nanometer-sized clay particles, have been added to produce tertiary nanocomposite. High aspect ratio and surface area of clay provide significant improvement in structural, mechanical, thermal and barrier properties in comparison to the base polymer. In this study, a series of PLA/PBS/layered silicate nanocomposites were produced by using a simple twin-screw extruder. PLA/PBS/Cloisite 30BX nanocomposites were prepared containing 1, 3, 5, 7 and 10 wt% of C30BX clay, while PLA and PBS polymers compositions were fixed at a ratio of 80 to 20. This study also included the validation of a gas barrier model for these biodegradable nanocomposites. WAXD indicated an exfoliated structure for nanocomposites having 1 and 3 wt% of clay, while predominantly development of intercalated structures was noticed for nanocomposites higher than 5 wt% of clay. However, TEM images confirmed a mixed morphology of intercalated and exfoliated structure for nanocomposite having 1 wt% of clay, while some clusters or agglomerated tactoids were detected for nanocomposites having more than 3 wt% of clay contents. The percolation threshold region for these nanocomposites lied between 3-5 wt% of clay loadings. Liquid-like behaviour of PLA/PBS blends gradually changed to solid-like behaviour with the increase in concentration of clay. Shear viscosity for the nanocomposites decreased as shear rate increased, exhibiting shear thinning non-Newtonian behaviour. Tensile strength and Young's modulus initially increased for nanocomposites of up to 3 wt% of clay but then decreased with the introduction of more clay. At high clay content (more than 3 wt%), clay particles tend to aggregate which causes microcracks at the interface of clay-polymer by lowering the polymer-clay interaction. Percentage elongation at break did not show any improvement with the addition of clay. PLA/PBS blends were considered as immiscible with each other as two separate glass transition and melting temperatures were observed in modulated differential scanning calorimetry (MDSC) thermograms. MDSC showed that crystallinity of the nanocomposites was not much affected by the addition of clay and hence some compatibilizer is required. Thermogravimetric analysis showed that the nanocomposite containing 3 wt% of clay demonstrated highest thermal stability compared to other nanocomposites. Decrease in thermal stability was noticed above 3 wt% clay; however the initial degradation temperature of nanocomposites with 5, 7 and 10 wt% of clay was higher than that of PLA/PBS blend alone. Gas barrier property measurements were undertaken to investigate the transmission of oxygen gas and water vapours. Oxygen barrier properties showed significant improvement with these nanocomposites, while that for water vapour modest improvement was observed. By comparing the relative permeabilities obtained from the experiments and the model, it was concluded that PLA/PBS/clay nanocomposites validated the Bharadwaj model for up to 3 wt% of clay concentration.
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Kjellgren, Henrik. "Influence of paper properties and polymer coatings on barrier properties of greaseproof paper." Doctoral thesis, Karlstad : Faculty of Technology and Science, Chemical Engineering, Karlstads universitet, 2007. http://www.diva-portal.org/kau/abstract.xsql?dbid=1238.

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Ryan, David J. "High temperature degradation of combustion CVD coated thermal barrier coatings." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/18909.

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Yucel, Orcun. "Birefringence Gradient Development During Drying of Solution Cast Functional Films and Their Mechanical, Optical and Gas Barrier Properties." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1377699282.

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Eskner, Mats. "Mechanical Behaviour of Gas Turbine Coatings." Doctoral thesis, KTH, Materials Science and Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3776.

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Coatings are frequently applied on gas turbine components inorder to restrict surface degradation such as corrosion andoxidation of the structural material or to thermally insulatethe structural material against the hot environment, therebyincreasing the efficiency of the turbine. However, in order toobtain accurate lifetime expectancies and performance of thecoatings system it is necessary to have a reliableunderstanding of the mechanical properties and failuremechanisms of the coatings.

In this thesis, mechanical and fracture behaviour have beenstudied for a NiAl coating applied by a pack cementationprocess, an air-plasma sprayed NiCoCrAlY bondcoat, a vacuumplasma-sprayed NiCrAlY bondcoat and an air plasma-sprayed ZrO2+ 6-8 % Y2O3topcoat. The mechanical tests were carried out ata temperature interval between room temperature and 860oC.Small punch tests and spherical indentation were the testmethods applied for this purpose, in which existing bending andindentation theory were adopted for interpretation of the testresults. Efforts were made to validate the test methods toensure their relevance for coating property measurements. Itwas found that the combination of these two methods givescapability to predict the temperature dependence of severalrelevant mechanical properties of gas turbine coatings, forexample the hardness, elastic modulus, yield strength, fracturestrength, flow stress-strain behaviour and ductility.Furthermore, the plasma-sprayed coatings were tested in bothas-coated and heat-treated condition, which revealedsignificant difference in properties. Microstructuralexamination of the bondcoats showed that oxidation with loss ofaluminium plays an important role in the coating degradationand for the property changes in the coatings.

Keywords:small punch test, miniaturised disc bendingtests, spherical indentation, coatings, NiAl, APS-NiCoCrAlY,VPS-NiCrAlY, mechanical properties

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Mitschker, Felix [Verfasser], Peter [Gutachter] Awakowicz, and Anjana [Gutachter] Devi. "Influence of plasma parameters in pulsed microwave and radio frequency plasmas on the properties of gas barrier films on plastics / Felix Mitschker ; Gutachter: Peter Awakowicz, Anjana Devi ; Fakultät für Elektrotechnik und Informationstechnik." Bochum : Ruhr-Universität Bochum, 2019. http://d-nb.info/1175205095/34.

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Freymond, Clément. "ETUDE DE L’IMPACT DU CONFINEMENT DE L’ETHYLENE-ALCOOL VINYLIQUE SUR SA CRISTALLISATION ET SES PROPRIETES BARRIERES AUX GAZ." Thesis, Paris, ENSAM, 2018. http://www.theses.fr/2018ENAM0072.

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L’éthylène-alcool vinylique (EVOH) est un copolymère utilisé fréquemment dans les emballages alimentaires en raison de ses fortes capacités barrière aux gaz, qui sont directement liées à la structure cristalline et au réseau de liaisons hydrogènes du matériau, mais sont de ce fait très sensibles à la présence d’humidité. Les films pour l'emballage alimentaire sont ainsi classiquement formés par la combinaison de ce polymère avec un polymère peu sensible à l’eau pour le protéger (polyéthylène ou polypropylène généralement) sous forme d'une structure multicouche, formée par le procédé de coextrusion. L’objectif de ce travail de thèse a été d’étudier le comportement et plus précisément la cristallisation de l’EVOH dans un système multinanocouche, obtenu à l’aide d’un procédé innovant de coextrusion multinanocouches, qui peut amener un confinement de l’EVOH. Pour cela, nous avons tout d’abord étudié la cristallisation du matériau en masse, d’un point de vue morphologique et cinétique, en conditions isothermes et anisothermes. Par la suite, l’EVOH sous confinement a été étudié dans des films ultra minces et dans des films multinanocouches, en le combinant avec un copolymère d’oléfine cyclique (COC), dont la haute température de transition vitreuse a induit un confinement « dur » de l’EVOH. Nous avons finalement fabriqué deux types de films multinanocouches industriels dédiés à l’emballage alimentaire, à l’aide dans un premier temps d’une polyoléfine classique, PE linéaire à basse densité, et ensuite d’une combinaison de deux grades d’EVOH. Des films multinanocouches transparents avec des couches homogènes, continues et de très faibles épaisseurs (quelques dizaines de nanomètres) ont ainsi été fabriqués. Ces deux systèmes ont mis en évidence une amélioration substantielle de leur perméabilité à l’oxygène en conditions humides. Des études complémentaires ont été effectuées et plusieurs hypothèses formulées en vue d’expliquer l’origine de ces améliorations
Ethylene-vinyl alcohol (EVOH) is a copolymer commonly used in food packaging because of its high gas barrier properties, directly related to the crystalline structure and the hydrogen bonds network of the material, but therefore very sensitive to the presence of moisture. Films for food packaging are thus conventionally formed by the combination of EVOH with a water-insensitive polymer to protect it (usually polyethylene or polypropylene), in a multilayered structure fabricated by a coextrusion process. The aim of this work was to study the behavior and more precisely the crystallization of EVOH in a multinanolayered system, obtained thanks to an innovative multilayer process that can induce a confinement of EVOH. For this aim, we have first studied the crystallization of the bulk material, from a morphological and kinetic point of view under isothermal and non-isothermal conditions. Thereafter, EVOH behavior under confinement was studied in ultra-thin films and in multinanolayered films by combining it with a cyclic olefin copolymer (COC), whose high glass transition temperature induced a "hard" confinement of EVOH. We have finally manufactured two multinanolayered industrial systems, dedicated to food packaging, using, first, a conventional polyolefin (linear low-density PE) and then, a combination of two grades of EVOH. Transparent multinanolayered films with homogeneous, continuous and thin layers (several tens of nanometers) have thus been manufactured. These two systems have shown a significant improvement in their oxygen permeability under humid conditions. Complementary experiments have been performed and several hypotheses formulated in order to explain the origin of this improvement
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Barboza, Elaine Moraes. "Avaliação das propriedades de barreira a gases de membranas obtidas a partir de dispersões aquosas à base de poliuretanos e argila." Universidade do Estado do Rio de Janeiro, 2011. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=2558.

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Materiais nanoestruturados têm recebido destaque na comunidade científica, destacando-se, dentre eles, os nanocompósitos à base de polímeros e argila. Quando esses materiais são obtidos no estado líquido, ressalta-se também o uso de água em substituição a solventes orgânicos, devido a questões ambientais. Neste trabalho foram sintetizadas dispersões aquosas à base de poliuretanos (WPUs) e argila hidrofílica do tipo montimorilonita (MMT) de natureza sódica, com o objetivo de avaliar as propriedades de barreira a gases conferidas pela presença de argila e pela variação nas proporções entre os segmentos flexíveis poli(glicol propilênico) (PPG) e o copolímero em bloco à base de poli(glicol etilênico) e poli(glicol propilênico) (EG-b-PG). Os monômeros empregados na síntese foram: poli(glicol propilênico) (PPG); copolímero em bloco à base de poli(glicol etilênico) e poli(glicol propilênico) (EG-b-PG), com teor de 7% de EG; ácido dimetilolpropiônico (DMPA), diisocianato de isoforona (IPDI) e etilenodiamina (EDA), como extensor de cadeia. Foram sintetizadas dispersões aquosas com e sem a presença de argila, fixando-se a razão entre o número de equivalentes-grama de grupos diisocianato e hidroxila (razão NCO/OH) em 1,5. Nas formulações foi variado também o teor de argila em relação à massa de prepolímero em 0,5% e 1%. Foi adicionada uma etapa de agitação adicional com dispersor Turrax em algumas formulações. A argila foi previamente deslaminada em água deionizada e incorporada à formulação na etapa da dispersão do prepolímero. As dispersões foram avaliadas, quanto ao teor de sólidos totais, tamanho médio de partícula e viscosidade aparente. Os filmes vazados a partir das dispersões foram caracterizados por espectrometria na região do infravermelho (FTIR) e permeabilidade ao CO2. A resistência térmica dos filmes foi determinada por termogravimetria (TG). Foram observadas modificações nas propriedades dos filmes obtidos com a inserção da argila e com a variação no teor de segmentos à base de poli(glicol etilênico). A inserção da argila promoveu uma melhoria na resistência térmica das membranas bem como uma redução na permeabilidade das mesmas. Foi observado um aumento na permeabilidade das membranas obtidas a partir das formulações com maior percentual de copolímero (EG-b-PG), com e sem argila.
Nanostructured materials have been receiving increasing attention of scientific community, especially systems of nanocomposites based on polymer and clay. These materials can be obtained in aqueous state and the use of water, replacing organic solvents, is an important line of research due to environmental issues. In this work, dispersions based on waterbone polyurethanes and sodic hydrophilic clay montmorillonite (MMT) were synthesized, in order to evaluate the possible formation of nanocomposites (NWPUs). The monomers employed in the synthesis were: poly (propylene glycol) (PPG), block copolymer based on poly (ethylene glycol) and poly (propylene glycol) (EG-b-PG), containing 7% ethylene glycol; dimethylolpropionic acid (DMPA); isophorone diisocyanate (IPDI); and ethylenediamine (EDA) as chain extender. Aqueous dispersions with and without clay were synthesized by fixing the ratio between the equivalent-grams of diisocyanate and hydroxyl groups (NCO/OH ratio) in 1.5. The clay content also varied from 0.5% to 1% related to prepolymer initial mass. An additional stirring step with Turrax disperser was made in some formulations. The clay was previously delaminated in deionized water and incorporated at prepolymer dispersion in water-addition step. The dispersions were then evaluated in terms of solids content, particle size and apparent viscosity. The films cast from dispersions were characterized by infrared spectrometry (FTIR), thermogravimetry (TG) and permeability to CO2. Cast films were obtained and the gas barrier properties imparted by the clay were analyzed as well as the influence of poly (ethylene glycol) segments content. The insertion of clay imparted an improvement in thermal resistance properties and a decrease in membrane permeability. It was also observed an increase in permeability to CO2 of membranes obtained from formulations containing the higher amount of copolymer (EG-b-PG), independent of clay content.
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Petersen, Julien. "Développement de surfaces fonctionnelles par polymérisation plasma à la pression atmosphérique : applications aux propriétés superhydrophobes, barrières aux gaz et aux UV." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00992185.

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Le manuscrit porte sur l'élaboration de couches minces ayant des propriétés barrières aux liquides, aux gaz et aux ultra-violets. Pour réaliser nos différents systèmes, la technologie plasma à décharge à barrière diélectrique à la pression atmosphérique (DBD) a été utilisée. Dans la première partie, des films polymère plasma à base de 1H, 1H, 2H, 2H, Perfluorodecyl acrylate ont été développé. En fonction des paramètres plasma une surface dîtes superhydrophobe en une étape a été obtenue grâce à l'obtention d'un film composé de nanoparticules fluorés. La seconde partie des travaux a consisté à développer des films barrières aux gaz à partir de l'hexamethyldisiloxane. Ainsi, des films minces SiOx et multicouches SiOxHyCz/SiOx ont pu être obtenue afin d'améliorer les performances barrières de substrat PET et PEN. Enfin, l'obtention de film barrière aux UV a consisté à une croissance in-situ de nanoparticules de dioxyde de titane (TiO2) à partir du film polymère plasma. La matrice polymère constitué d'une structure siloxane et aminée plasma joue le rôle de nano-réacteur pour la croissance de cristaux de TiO2.
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Books on the topic "Gas barrier properties"

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Miller, Robert A. Thermal barrier coatings for gas turbine and diesel engines. [Washington, D.C.]: NASA, 1990.

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J, Brindley W., Bailey M. Murray, and United States. National Aeronautics and Space Administration., eds. Thermal barrier coatings for gas turbine and diesel engines. [Washington, D.C.]: NASA, 1990.

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D, Sheffler K., Ortiz Milton, and Lewis Research Center, eds. Thermal barrier coating life prediction model development: Phase 1, final report. Cleveland, Ohio: NASA Lewis Research Center, 1989.

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Book chapters on the topic "Gas barrier properties"

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Ghanbari, Abbas, Marie-Claude Heuzey, Pierre J. Carreau, and Minh-Tan Ton-That. "Morphology and Gas Barrier Properties of Polymer Nanocomposites." In Polymer Morphology, 397–417. Hoboken, NJ, USA: John Wiley & Sons, Inc, 2016. http://dx.doi.org/10.1002/9781118892756.ch21.

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Ando, Shota, Shuichi Sato, and Kazukiyo Nagai. "Gas Permeation and Barrier Properties of Liquid Crystalline Polymers." In Polymers and Polymeric Composites: A Reference Series, 1–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-642-37179-0_67-1.

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Ando, Shota, Shuichi Sato, and Kazukiyo Nagai. "Gas Permeation and Barrier Properties of Liquid Crystalline Polymers." In Polymers and Polymeric Composites: A Reference Series, 523–47. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43350-5_67.

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Maina, John N. "Morphological and Morphometric Properties of the Blood-Gas Barrier: Comparative Perspectives." In The Vertebrate Blood-Gas Barrier in Health and Disease, 15–38. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18392-3_2.

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Swain, Sarat Kumar. "Gas Barrier Properties of Biopolymer-based Nanocomposites: Application in Food Packaging." In Advanced Materials for Agriculture, Food, and Environmental Safety, 369–84. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118773857.ch13.

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Lee, Jong-Chan, Morton H. Litt, and Charles E. Rogers. "Gas Barrier and Thermal Properties of (Alkylsulfonyl)methyl-Substituted Poly(oxyalkylene)s." In ACS Symposium Series, 433–52. Washington, DC: American Chemical Society, 1999. http://dx.doi.org/10.1021/bk-1998-0710.ch029.

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Sęk, G., K. Ryczko, M. Ciorga, L. Bryja, M. Kubisa, J. Misiewicz, M. Bayer, J. Koeth, and A. Forchel. "Optical Investigation of Coupled GaAs/Al0.3Ga0.7As Double Quantum Wells Separated by AIAs Barriers." In Optical Properties of Semiconductor Nanostructures, 91–95. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4158-1_10.

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Schierbaum, K. D., X. Wei-Xing, S. Fischer, and W. Göpel. "Schottky Barriers and Ohmic Contacts with Pt/TiO2(110): Implications to Control Gas Sensor Properties." In Adsorption on Ordered Surfaces of Ionic Solids and Thin Films, 268–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78632-7_24.

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Ploog, K., W. Stolz, and L. Tapfer. "Effect of Barrier Configuration and Interface Quality on Structural and Electronic Properties of MBE-Grown AlxGa1-xAs/GaAs, AlxGa1-xSb/GaSb and AlxIn1-xAs/GaxIn1-xAs Superlattices." In Thin Film Growth Techniques for Low-Dimensional Structures, 5–18. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-9145-6_2.

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Tolinski, Michael. "Gas Barrier Properties Enhancement." In Additives for Polyolefins, 171–73. Elsevier, 2015. http://dx.doi.org/10.1016/b978-0-323-35884-2.00018-1.

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Conference papers on the topic "Gas barrier properties"

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Senturk, Ufuk, Rogerio S. Lima, Carlos R. C. Lima, and Christopher C. Berndt. "Deformation of Plasma Sprayed Thermal Barrier Coatings." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-348.

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The deformation behavior of thermally sprayed partially stabilized zirconia (PSZ) coatings are investigated using Hertzian indentation and four-point bend testing, with in situ acoustic emission monitoring. The experimental deformation curves, together with the corresponding acoustic emission responses and the fracture properties of the material are used in defining the deformation characteristics of the coating (ceramic overlay with metallic bond coal where applicable) and substrate composite system. Experiments are aimed in examining the influence of the bond coat and the coating properties on the form of deformation. Substrate temperature and pauses during spraying are demonstrated to strongly effect the coating properties and the resulting fracture/failure characteristics of the composite system.
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Berndt, Christopher C. "Material Property Measurements on Thermal Barrier Coatings." In ASME 1988 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1988. http://dx.doi.org/10.1115/88-gt-277.

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The material property measurements of thermal barrier coatings from cyclic furnace, thermal rig, thermal expansion, acoustic emission and tensile adhesion test methods are critically examined. Some basic engineering properties of coatings such as the elastic modulus have not been measured without ambiguity. Data of this nature is essential to the success of modeling studies. Insights into the mechanical properties of coatings have been gained by carrying out instrumented tensile adhesion tests. The general view of the coating deformation process is that the individual lamellae slide over each other and this promotes a “pseudo-ductility” response in the coating. Monitoring of the acoustic emission response of coatings during thermal cycling experiments suggests that there are two distinct cracking processes. The macro-cracking behaviour, indicated by a change in the acoustic emission count rate, is the predominant mechanism which leads to coating failure. It is further shown that the acceptance tests used by industry, although useful in ranking coatings in terms of a particular property, present no fundamental knowledge concerning the material properties of coatings. It is only when the phenomenological characteristics of the thermo-mechanical response of coatings is understood that coating development will substantially progress.
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Wang, Yao, Pei-feng Hsu, and Yingsang Wu. "Near Infrared Radiative Properties of Thermal Barrier Coatings." In ASME 2021 Heat Transfer Summer Conference collocated with the ASME 2021 15th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/ht2021-61258.

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Abstract Thermal barrier coatings are widely used in gas turbines to protect the gas turbine metal components against very high combustion product temperature. To improve energy efficiency, higher combustion temperatures are needed. A limiting factor at present is the stability under extreme and prolonged heating of thermal barrier coatings. The coatings are typically made by the air plasma sprayed process in which fine particles of yttria-stabilized zirconia (YSZ) are melted or partially melted and ejected from plasma jet at high speed onto the bond coated substrate metal. With increasing combustion temperature and pressure in the modern gas turbine engines radiative heat transfer is becoming an important portion of the overall heat transfer in the thermal barrier coating. This study has demonstrated that the commonly used Kubelka-Munk method in the radiative property reduction from the measured transmittance and reflectance spectra of YSZ coatings will incur inaccurate result when the coating optical thickness is not sufficiently large. An alternative method — the discrete ordinates method with the asymmetric spherical ring angular quadrature — is used instead. The absorption and scattering coefficients of air plasma sprayed YSZ films are determined over the wavelength range from 1 to 2.6 μm at room temperature. Over this near infrared wavelength range, the scattering coefficient decreases with the increasing wavelength and the absorption coefficient is very small overall. The pore size distributions before and after the 50-hr temperature gradient, thermal cycling are compared. The sintering effect as well as the crack growth will impact the coating radiative properties. These results point to a clear need for better understanding of the radiative heat transfer process, which includes the microstructure-property relationship, progressive changes of the radiative properties with the operation condition and time.
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Meier, Susan Manning, David M. Nissley, Keith D. Sheffler, and Thomas A. Cruse. "Thermal Barrier Coating Life Prediction Model Development." In ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-040.

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A thermal barrier coated (TBC) turbine component design system, including an accurate TBC life prediction model, is needed to realize the full potential of available TBC engine performance and/or durability benefits. The objective of this work, which was sponsored in part by NASA under the Hot Section Technology (HOST) Program (Contract NAS3-23944), was to generate a life prediction model for electron beam - physical vapor deposited (EB-PVD) zirconia TBC. Specific results include EB-PVD zirconia mechanical and physical properties, coating adherence strength measurements, interfacial oxide growth characteristics, quantitative cyclic thermal spallation life data, and a spallation life model.
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Aruna, S. T., N. Balaji, and B. Arul Paligan. "A Comparative Study on the Synthesis and Properties of Yttria Stabilized Zirconia (YSZ) and Lanthana Doped YSZ Plasma Sprayed Thermal Barrier Coatings." In ASME 2013 Gas Turbine India Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gtindia2013-3563.

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Ceramic thermal barrier coatings (TBCs) have been used for decades to extend the life of combustors and high temperature turbine stationary and rotating components to increase the operating temperature and in turn the performance of gas turbines or diesel engines can be increased. At present, thermal barrier coatings (TBCs) of Y2O3 partially stabilized ZrO2 (YSZ) films are widely used. In recent years ceramic compositions useful in thermal barrier coatings having reduced thermal conductivity are being explored to further increasing the operating temperature of gas turbines and improve the engine efficiency. In the present study, a comparison of the properties of state-of-the art 8wt% yttria stabilized zirconia (YSZ) and lanthana doped YSZ plasma sprayed coatings is presented. Plasma sprayable powders were prepared in the laboratory by a single step precipitation method and characterized. Both the powders had good flowability. These powders were plasma sprayed at identical critical plasma spray parameters. The coatings were characterized for phase, microstructure and thermal conductivity. Both the powders and coatings exhibited tetragonal form of zirconia and no traces of lanthana were observed. Both the coatings exhibited similar porosity levels. Microstructure of the coatings revealed porous coating with good adhesion of the bondcoat with the topcoat. Plasma sprayed 8wt% YSZ and lanthana doped YSZ exhibited thermal conductivity values of 0.88 and 0.67 W m−1 K−1 respectively which is lower than that reported in literature. This study shows that lanthana doping in YSZ helps in lowering the thermal conductivity and hence this coating may be a potential candidate for TBC application.
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Malléner, W., K. H. Rauwald, and R. Vaßen. "Influence of Starting Powder Properties on Thermal Barrier Coatings." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p1265.

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Abstract With a view to the development of thermal barrier coatings on turbine blades, such coatings were developed on the basis of Y2O3-stabilized ZrO2 and optimized with respect to their reproducibility. Particular attention was given to the spray efficiency and, in particular, the coating porosity. The porosity was measured by Hg porosimetry, which proved to be a reliable method of characterization. The plasma gas flows play an important role for a high reproducibility of the coating properties. High reproducibility of the porosity and spray efficiency was achieved for low argon flows, for which the influences of all the other parameters, such as electric arc current, meandering and sample cooling during plasma spraying or the cathode operating time of the burner, were of minor relevance for the coating properties. The spray efficiency is clearly influenced by the given powder rate and the carrier gas flow for the type of burner used. The change of the grain fraction in the plasma jet was examined for two different powders. Finally, thermal cycling tests were carried out and evaluated for pre-optimized thermal barrier coating samples.
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Fujii, Tomoharu, and Takeshi Takahashi. "Estimation of Thermophysical Properties and Microstructure of Aged Thermal Barrier Coatings." In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0417.

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A thermal barrier coating (TBC) is used for protecting hot gas path parts, and is useful for allowing the turbine inlet gas temperature to be increased. In order to quantitatively evaluate the performance of TBCs, the thermal conductivity of TBCs on the combustor of a gas turbine were measured. The results indicate that the thermal conductivity of age-deteriorated TBCs were higher than that of the as-sprayed TBC. This finding suggested that the thermal barrier performance of the TBC had deteriorated. When the thermal barrier performance of a TBC deteriorates, the temperature of the metal substrate rises, shortening the service life of hot gas path components. Accordingly, using experimental TBCs, laboratory-scale studies were performed to identify the causes of the deterioration of thermal barrier performance in TBCs. Six types of TBCs, prepared from six grades of plasma spray powder of yttria stabilized zirconia (YSZ), were tested. Average powder size, powder configuration, and percentage of yttria were the parameters of plasma spray powder taken to measure the thermophysical properties and carry out microstructural analyses on the as-sprayed TBCs and heat-treated TBCs. The results of the thermophysical property measurements indicate that the thermal barrier performance of heat-treated TBCs were two to three times greater than that of the as-sprayed TBCs. The results of the microstructural analyses revealed that the deterioration in performance was caused by changes occurring in the crystalline structure and the reduction of the non-contact area as in TBCs. The changes in thermal conductivity of TBCs were expressed as coefficients of porosity, crystalline structure, and heating time and temperature.
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Florovic, M., J. Kovac, B. Sciana, D. Radziewicz, D. Pucicki, I. Zborowska-Lindert, M. Tlaczala, and I. Vavra. "Low temperature investigation of electrical and optical properties of InGaAsN/Gas QW Schottky barrier photodetectors." In 2012 International Conference on Advanced Semiconductor Devices & Microsystems (ASDAM). IEEE, 2012. http://dx.doi.org/10.1109/asdam.2012.6418577.

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Nelson, Warren A., Robert M. Orenstein, Paul S. DiMascio, and Curtis A. Johnson. "Development of Advanced Thermal Barrier Coatings for Severe Environments." In ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-270.

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Air plasma sprayed yttria-stabilized zirconia thermal barrier coatings (TBCs) have been successfully used to extend life of superalloy components in utility gas turbines. GE Power Generation has over ten years of field experience with TBCs on combustor hardware, and over 20,000 hours of field experience with TBCs on turbine nozzles. Despite this promising experience, the full advantage of TBCs can be achieved only when the reliability of the coating approaches that of the superalloy component substrate. Recent work at GE has emphasized characterization of mechanical properties and physical attributes of TBCs to understand better the causes of delamination crack growth and coating spallation. In addition, unique tests to examine the TBC response under conditions simulating severe gas turbine service environments have been developed. Through evaluation of the results from comparative TBC ranking tests, pre-production application experience and field test results, gas turbine design engineers and materials process engineers are rapidly gaining the practical knowledge needed to integrate the TBC into the component design.
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López Guerrero, María Del Mar, Clara Casado-Coterillo, César Rubio, Carlos Téllez, Joaquín Coronas, and Ángel Irabien. "IMPROVING GAS BARRIER PROPERTIES USING MIXED MATRIX MEMBRANES BASED ON ION EXCHANGE CAPACITIES OF THE POLYMERS." In 23rd International Academic Conference, Venice. International Institute of Social and Economic Sciences, 2016. http://dx.doi.org/10.20472/iac.2016.023.062.

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