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PAINTINDIA . Vol. LXIII, N° 9Mention de date : 09/2013Paru le : 15/09/2013 |
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Ajouter le résultat dans votre panierBuilding novel functionalities in coatings using supramolecular polymers / Nilesh S. Phalke in PAINTINDIA, Vol. LXIII, N° 9 (09/2013)
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Titre : Building novel functionalities in coatings using supramolecular polymers Type de document : texte imprimé Auteurs : Nilesh S. Phalke, Auteur ; Rajesh M. Shah, Auteur Année de publication : 2013 Article en page(s) : p. 53-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Polymères supramoléculaires Les polymères supramoléculaires sont des longues chaînes linéaires formées par assemblage réversible de composés de faible masse molaire. La réversibilité de l'association confère à ces matériaux des propriétés proches, mais complémentaires de celles des polymères classiques. En effet, dans les conditions d'utilisation, un polymère supra-moléculaire est en équilibre avec son monomère. Par conséquent, en modifiant légèrement les conditions expérimentales (solvant, concentration, température, cisaillement...), il est possible d'allonger ou de raccourcir les chaînes supramoléculaires et donc de changer les propriétés (rhéologiques, mécaniques...) du système. Cette particularité constitue un avantage pour de nombreuses applications potentielles, ainsi qu'une difficulté de caractérisation.Tags : 'Polymères supramoléculaires' 'Liaisons hydrogène' 'Revêtement auto-réparant' Hydrogels 'Composés de coordination' 'Métal-Ligand' 'Host-Guest' 'Plug n play' Index. décimale : 668.9 Polymères Résumé : Supramolecular polymers are polymeric arrays of monomer units, held together by reversible and highly directional secondary interactions — that is, noncovalent bonds, such as hydrogen bonds. The resulting materials therefore maintain their polymeric properties in solution. The directions and strengths of the interactions are precisely tuned so that the array of molecules behaves as a polymer. The high reversibility of the non-covalent bonds ensures that supramolecular polymers are always formed under conditions of thermodynamic equilibrium, and hence the lengths of the chains are directly related to the strength of the non-covalent bond, the concentration of the monomer and the temperature.
Conventional polymers have excellent properties as materials, but when they melt they become highly viscous due to the result of entanglement of their macromolecules. High temperatures and pressures are typically required to provide a melt of sufficiently low viscosity for processing, and this limits their applications. But supramolecular polymers combine good material properties with low viscosity melts that are easy to handle. Some supramolecular polymers also have remarkable characteristics unique to their class, such as the ability to self-heal the fractures in their structure as they permit a rapid response to a change in environment, resulting in easily controllable strength and selectivity of noncovalent interactions. This enables the tuning of material properties in terms of strength, reversibility and directionality which can be utilized to build novel functionalities in coatings.
In this review, an attempt is made to illustrate the classification, mechanisms and applications of the versatile chemistry of supramolecular polymers. It also focuses on important concepts such as molecular self-assembly, folding, molecular recognition, host-guest chemistry and mechanically-interlocked molecular architectures exhibited by supramolecular chemistry. Practical applications of supramolecular polymer chemistry in coatings technology such as self-healing materials, thermally responsive materials and polymer blends are also discussed.Note de contenu : - CLASSIFICATION
- SUPRAMOLECULAR POLYMERIZATION MECHANISMS : A. Isodesmic or Multi Stage oOpen Association (MSOA) - B. Ring-chain - C. Cooperative growth or nucleation-elongation - Hydrogen-bonded polymers - Metal-ligand coordination polymers - π-π stacking
- SUPRAMOLECULAR POLYMERIZATION APPROACHES
- APPLICATIONS OF SUPRAMOLECULAR POLYMERS : Self-healing applications in coatings - Oxygen barrier coatings based on supramolecular assembly of melamine - Supramolecular polymeric hydrogels - Phases separation of supramolecular and dynamic block copolymers - Polymer-coated optical sensor offers improved explosives detection - Ink-jet inks - Catalysis and artificial enzymes based on supramolecular scaffolds - Green chemistry
- FUTURE PERSPECTIVESPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19675
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Code-barres Cote Support Localisation Section Disponibilité 15622 - Périodique Bibliothèque principale Documentaires Disponible Antireflective coatings / Saurabh Kusurkar in PAINTINDIA, Vol. LXIII, N° 9 (09/2013)
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Titre : Antireflective coatings Type de document : texte imprimé Auteurs : Saurabh Kusurkar, Auteur Année de publication : 2013 Article en page(s) : p. 67-72 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anti-réflectance
Revêtement antireflet:Peinture antirefletTags : 'Revêtement optique' Interface Antireflet 'Images fantômes' Optoélectronique 'Interférence destructive' Index. décimale : 667.9 Revêtements et enduits Résumé : An optical coating is one or more thin layers of material deposited on an optical component such as a lens or, mirror, which alters the way in which the optic (Glass ) reflects and transmits light. One of the types of optical coating is an antireflection coating, which reduces unwanted reflections from surfaces.
As light passes through an uncoated glass substrate, approximately 4% will be reflected at each interface. This results in a total transmission of only 92% of the incident light. Applying an AR coating on each surface will increase the throughput of the system and reduce hazards caused by reflections traveling backwards through the system (e.g. ghost images).
Antireflection (AR) coatings have been widely employed in optical and optoelectronic materials, a decrease in light reflection, and thus an increase in the transmittance of light, enables clear viewing with the eyes of glass and displaying surfaces. AR coatings find its application to Image sensors, Lithograph; Light-emitting diodes (LEDs) are a common solid state light source. Also in camera lenses, Solar panels etc where loss of light by reflection is the loss of output and quality of the product.
The principle of AR coating is based on the destructive interference of reflected light from interfaces between air and a film.Note de contenu : - SOME EXAMPLES OF ANTIREFLECTIVE COATINGS BEFORE AND AFTER
- HOW DOES AN ANTI-REFLECTION COATING WORK ?
- ANTIREFLECTIVE POLYMERS : Fluoroacrylate - Fluorosilicate acrylate - Fluoroéthanes
- PERFLUOROPOLYETHERS/PERFLUOROPOLYOXETANES
- TYPES OF ANTIREFLECTIVE COATINGS : Tydex - Single layer MgF coating - V-type single wavelength AR coating - Broadband AR coating - Dual- and triple-band AR coating - Dual band infrared AR coating
- AR COATING - MARKET RESEARCH
- MARKET PLAYER : DSM coating/KhepriCoat - Brewer Science and Dow Chemical Company / ENSEMBLE ARC - DuPont/Teflon AF
- ANTIREFLECTIVE COATINGS - APPLICATION METHODS : Dip coating - Spray coating - Flow coating - PVD (Physical Vapor Deposition) - CVD (Chemical Vapor Deposition)
- AR COATING APPLICATION FIELDSPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19676
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Code-barres Cote Support Localisation Section Disponibilité 15622 - Périodique Bibliothèque principale Documentaires Disponible Intrinsically conductive polymer coating for corrosion protection / Dipankar Das in PAINTINDIA, Vol. LXIII, N° 9 (09/2013)
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Titre : Intrinsically conductive polymer coating for corrosion protection Type de document : texte imprimé Auteurs : Dipankar Das, Auteur Année de publication : 2013 Article en page(s) : p. 73-82 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs
Anticorrosion
Conducteurs organiques
Polyaniline
Polypyrroles
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : Intrinsically conducting polymers (ICPs) represent a special class of materials with variable properties and have a great interest in the field of coating, owing to their conductive ability and environmental regulation on heavy metal coating. Over the past thirty years these materials have been subject of intensive research and industrial application which are much more effective and proven themselves as a potential alternate to hazardous metal containing coating in order to control corrosion properties. Their potential has also been driven by the other applications like batteries, electro chromic display device and sensor etc. Intrinsically conducting polymers, especially polyaniline, are being studied with great interest and have potential of replacing some of the currently available materials. Various techniques used for synthesis of such polymers and their characterization have been discussed in this paper. This paper highlights the work relating to the protection of metal by use of ICPs and prospective application of conductive polymer depending on their different techniques and the future of these polymers. Note de contenu : - INTRODUCTION : Intrinsically conductive polymers - Corrosion protection
- THE STRUCTURE OF CONDUCTING POLYMER
- SYNTHESIZING TECHNIQUES : Chemical polymerization - Electrochemical polymerization - Polymerization using cyclic voltametry technique - Polymerization using potentiostatic technique - Polymerization using galvanostatic technique
- CHARACTERIZATION TECHNIQUE
- INTRINSICALLY CONDUCTIVE POLYMER FOR COATING : Corrosion protection by PANI/ferrite/alkyd nanocomposite - Paint blended coating - Casting based coatings
- THE FUTURE OF CONDUCTIVE POLYMERPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19677
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Code-barres Cote Support Localisation Section Disponibilité 15622 - Périodique Bibliothèque principale Documentaires Disponible High temperature heat resistant and electrochemical corrosion behaviour of powder coating of automotive exhaust muffler / Preeti Kum in PAINTINDIA, Vol. LXIII, N° 9 (09/2013)
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Titre : High temperature heat resistant and electrochemical corrosion behaviour of powder coating of automotive exhaust muffler Type de document : texte imprimé Auteurs : Preeti Kum, Auteur ; S. T. Vagge, Auteur Année de publication : 2013 Article en page(s) : p. 117-121 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aluminiage
Corrosion
Essais de brouillard salin
Résistance thermique
Revêtements poudre:Peinture poudre
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Corrosion is the main problem due to which automotive exhaust components have a Iimited life particularly in the exhaust mufflers and silencers. The effect of surface crystallised aluminium coating followed by powder coating on the corrosion performance is investigated in this research. Investigation is done for various temperatures of surface crystallisation at 200°C, 250 °C, 300°C, 350 °C and 400 °C. Exhaust mufflers are subjected to aggressive environments like marine, heavily polluted industrial atmosphere. Therefore in the present study the coated mufflers are exposed to salt spray environment. To evaluate corrosion behaviour after salt spray test electrochemical test, polarisation tests are performed. The results from experiment revealed that the untreated aluminium coating is fesser protective in nature than surface crystallised aluminium at higher temperatures of 300 °C, 350 °C and 400 °C followed by powder coating in which the high-density grain boundaries promote atomic migration and thus accelerates passivation or the formation of a protective Al oxide film to block further corrosion reaction. Surface crystallised aluminised powder coating withstands for 1000 hrs in salt spray after which it forms red rust and untreated aluminised samples for 240 hrs only. The protectiveness in terms of time of red rust formation and barrier protection was increased with increasing crystallising temperature. Note de contenu : - EXPERIMENTAL DETAILS : Materials - Procedure - Characterisation
- RESULTS DISCUSSION : Adhesion test - Visual inspection - The potentiodynamic polarization studies - Electrochemical impedance spectroscopy - Nyquist plotPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19678
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Code-barres Cote Support Localisation Section Disponibilité 15622 - Périodique Bibliothèque principale Documentaires Disponible Based on type of deterioration of the metal - Part 5 in PAINTINDIA, Vol. LXIII, N° 9 (09/2013)
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Titre : Based on type of deterioration of the metal - Part 5 Type de document : texte imprimé Année de publication : 2013 Langues : Anglais (eng) Catégories : Alliages
Corrosion
MétauxTags : 'Corrosion uniforme' Mesure Macrocorrosion Microcorrosion intercristalline' Métaux Alliages Luxation 'Effet défauts ponctuels' Imperfection 'Joints de grains' Index. décimale : 620.16 Métaux et leurs alliages Résumé : We have discussed the corrosion process based upon the mechanism of corrosion, and types of environment in part-2 and part-4. In this part we will study the corrosion process based upon the type of deterioration of metals. The fol lowing types of deterioration of the metal, due to corrosion, have been reported :
a. General corrosion or surface corrosion or extensive corrosion.
b. Inter-crystalline corrosion.
The pure metal is less susceptible to corrosion but lacks in many desired metallic properties. The al loy though is good for engineering works but is prone to corrosion. Undoubtedly the environment and metal surface heterogeneity cause corrosion but the geometrical structure causes more serious corrosion problem. The intercrystalline corrosion is many a time is not visible from naked eyes or is hidden and weakens the very basic property (mechanical strength) of a metal which causes loss to life, money and man power.Note de contenu : - GENERAL OR SURFACE CORROSION : Uniform corrosion - Mechanism of uniform corrosion - Measurements - Non-uniform corrosion
- INTERCRYSTALLINE CORROSION : Metal - Alloys - Crystal imperfections - Effect of point defects - Dislocation - Grain boundariesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19679
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Code-barres Cote Support Localisation Section Disponibilité 15622 - Périodique Bibliothèque principale Documentaires Disponible
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