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[article]
Titre : Anticorrosive self healing coatings Type de document : texte imprimé Auteurs : Ajay Chaurasiya, Auteur Année de publication : 2020 Article en page(s) : p. 56-82 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs
Anticorrosion
Catalyseurs
Emulsification
Métathèse (chimie)
Métaux -- Revêtements protecteurs
Microcapsules
Monomères
Nanocapsules
Passivité (Chimie)
Polymérisation
Revêtement autoréparant
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Autonomic healing materials respond without external intervention to environmental stimuli in a nonlinear and productive fashion, and have great potential for advanced engineering systems. Self-healing coatings, which autonomically repair and prevent corrosion of the underlying substrate, are of particular interest. Notably, the worldwide cost of corrosion has been year estimated to be nearly $300 billion per year. Recent studies on self-healing polymers have demonstrated repair of bulk mechanical damage as welI as dramatic increases in the fatigue life. Non-metallic (based on polymers or oxides) and metallic protective coatings are used to protect metal products against the harmful action of the corrosion environment Various approaches for achieving healing functionality encapsulation have been demonstrated, including reversible chemistry, networks, microvascular nanoparticle phase separation, poly-ionomers, fibres hollow and separation. monomer phase. The majority of these systems, however, have serious chemical and mechanical limitations, preventing their use as coatings. Modem engineered coatings are highly optimized materials in which dramatic modifications of the coating chemistry are unlikely to be acceptable. Here, we describe a generalized approach to self-healing polymer-coating systems, and demonstrate its effectiveness for both model and industrial ly important coating systems. Note de contenu : - Definition of self-healing
- Design strategies
- Release of healing agents
- Microcapsule embedment
- Hollow fiber embedment
- Microvascular system
- Reversible cross-links
- Diels-Alder (DA) and retro-DA reaction
- Ionomers
- Supramolecular polymers : Miscellaneous technologies - electrohydrodynamics
- CONDUCTIVITY : Shape memory effect
- Nanoparticle migrations
- Co-deposition
- Self-healing corrosion protection coatings polymeric coatings
- Protection of mild steel
- Protection of aluminium alloy
- Protection of magnesium alloy
- Coatings containing micro-nanocapsules
- Hybrid-oxide coatings
- Other self-healing coatings
- Self-healing process
- experimental analysis for cross cut corrosion resistance test
- Others applications
- Fig. 1 : Schematic representation of self-healing concept using embedded microcapsules
- Fig. 2 : Light microscopic picture of encapsulated DCPD and Grubb's catalyst
- Fig. 3 : Ring opening metathesis polymerization of DCPD
- Fig. 4 : Optical micrographs of hollow glass fibers
- Fig. 5 : Schematic representation of sel-healing concept using hollow fibers
- Fig. 6 : Schematic showing self-healing materials with 3D microvascular networks
- Fig. 7 : Schematic showing formation of highly cross-Iinked polymer (3M4F) using a multi-diene (four furan moieties, 4F) and multi-dienophile (three maleimide moieties, 3M) via DA reactions
- Fig. 8 : Chemical structure of functionalized maleimide and furan monomers
- Fig. 9 : Thermally reversible cross-linking reaction between TMI and TF through DA and retro-DA reactions
- Fig. 11 : Preparation of thermally reversible polyamides
- Fig. 12 : Schematic showing reversible ionic interactions
- Fig. 13 : Examples of supramolecular polymers from the literature : main-chain supramolecular polymers and side-chain supramolecular polyemrs
- Fig. 17 : Polymeric bis-terpyridine-metal complex (charge and anions omitted)
- Fig. 18 : Schematic showing electrohydrodynamic aggregation of particles
- Fig. 19 : Schematic showing conductive self-healing materials
- Fig. 20 : Representative three-dimensionsl profiles of a spherical indent at load of 15 N fresh indent and after healing above the austenite finish temperature
- Fig. 21 : Schematics showing electrolytic co-deposition of microcapsules (or mesoporous nanoparticles containing corrosion inhibitors) with metal ions
- Fig. 22 : Schematic illustration of a crack in the epoxy coating
- Fig. 23 : Schematic representation of the self-healing effect of the TiO, particle polymer composite coating
- Fig. 24 : Schematic Illustration of self healing zipper-like mechanism
- Fig. 25 : Schematic Self-healing mechanism of polyelectrolyte multilayers
- Fig. 25 : Schematic shows how a capsule is created
- Fig. 26 : Schematic shows structure of silane film
- Fig. 27 : Epoxy with control, epoxy with corrosion inhibitor and epoxy with self healing additives
- Fig. 28 : Schematic showing the reflow effect of self-haling clear coatsEn ligne : https://drive.google.com/file/d/1Z-i4m7ZBZI117NIGydOCioBCW5SAUQyz/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34661
in PAINTINDIA > Vol. LXX, N° 9 (09/2020) . - p. 56-82[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22359 - Périodique Bibliothèque principale Documentaires Disponible In-depth understanding of the leather fatliquoring process : A review / M. A. Habib in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 1 (01-02/2022)
[article]
Titre : In-depth understanding of the leather fatliquoring process : A review Type de document : texte imprimé Auteurs : M. A. Habib, Auteur Année de publication : 2022 Article en page(s) : p. 13-19 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène -- Structure
Emulsification
Emulsions
Huiles et graisses
Produits de nourriture du cuirIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Tanning involves economic and environmental benefits, it transfers low-value by-products (animal hide and skin) into value-added products (natural leather). Introducing fatty matter into the inter-spaces of tanned leather (stiff and unusable) — fatliquoring, restores the fat removed in tanning and restores flexibility to the leather. This article provides an in-depth understanding of the process. Previous chemical treatment and building of a fatliquor emulsion are the watershed points in the process and the main factor affecting the efficiency of the process is the arriva) of the fatty substance to the collagen fibrils which are thus coated with a thin layer of fats that promote sliding of fibrils and prevent adhesion. Successful fatliquoring is achieved through using an emulsion of specific particle size to enable the oil droplets to penetrate the leather reaching to fibril level. Note de contenu : - Collagen protein structure
- Fibril bundles and fatliquor mechanism
- Emulsifying of fatty matter and emulsion efficiency
- Types of fatliquor emulsion
- Modified natural oil and fat used in fatliquoringEn ligne : https://drive.google.com/file/d/1D3rKpsxbZyVW-TQFEarRV5giierkoamK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36968
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 1 (01-02/2022) . - p. 13-19[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23210 - Périodique Bibliothèque principale Documentaires Disponible Modification of collagen hydrosylate be edac / Keyong Tang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 1 (01-02/2008)
[article]
Titre : Modification of collagen hydrosylate be edac Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Jian Cao, Auteur ; Wang Jintao, Auteur ; Wang Zhongtai, Auteur Année de publication : 2008 Article en page(s) : p. 23-29 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carbodiimides
Collagène
Emulsification
Emulsions -- Stabilité
Huiles et graisses -- Absorption
Humidité -- Absorption:Eau -- Absorption
Hydrolysats de protéines
Matériaux -- Modifications chimiques
Poids moléculaires
TempératureIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The work in this paper describes the modification of collagen hydrolysate with 1-ethyl-3- (3-dimethyl aminopropyl)-carbodiimide (EDAC). The effects of factors that may affect the cross-linking reactions in the process of modification such as EDAC level, reaction temperature, reaction time, and pH were studied. The optimal modification conditions were obtained to give modified products with the best emulsification and emulsion stability. Changes in molecular weight, emulsification capacity, emulsification stability, water absorption and oil absorption of the collagen hydrolysate before and after modification were studied and compared. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Determination of molecular weight of collagen hydrolysate - Chemical modification - Determination of emulsification capacity and emulsification stability - Determination of water absorption - Determination of oil absorption - Orthogonal experiment
- RESULTS AND DISCUSSION : Influence of EDAC level on emulsification capacity, emulsification stability and molecular weight - Influence of pH on emulsification capacity, emulsification stability and molecular weight - Influence of reaction time on emulsification capacity, emulsification stability and molecular weight - Influence of reaction temperature on emulsification capacity, emulsification stability and molecular weight - Orthogonal Tests - Changes of molecular weight and functional properties of collagen hydrolysate before and after modification
- Table 1 : Levels of factors in orthogonal tests
- Table 2 : Design and results of orthogonal tests
- Table 3 : Several functional properties of collagen hydrolysate before and after modification with EDACEn ligne : https://drive.google.com/file/d/1nALamChUCcdYL4y5zofFJjVkmiQw_inM/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38918
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 1 (01-02/2008) . - p. 23-29[article]Removal of Cr(VI) by emulsion membrane technology / Liu Anjun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 2 (03-04/2007)
[article]
Titre : Removal of Cr(VI) by emulsion membrane technology Type de document : texte imprimé Auteurs : Liu Anjun, Auteur ; Ding Shaolan, Auteur ; Zhao Chuanchuan, Auteur ; Ren Huijun, Auteur ; Zhao Quanyong, Auteur Année de publication : 2007 Article en page(s) : p. 52-58 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome hexavalent
Cuirs et peaux -- Industrie
Déchets industriels -- Elimination
Eaux usées -- Epuration
Emulsification
Extraction (chimie)
Membrane liquide en émulsion
pH -- Mesure
SurfactantsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This article describes our study on the removal of Cr(VI) with the emulsion membrane formed from trioctylamine, secondary capryl alcohol and tributyl phosphate as carriers, Span-80 and Lan-113 as surfactants, and kerosene as the membrane solvent. Further, we have performed an orthogonal experiment regarding the carriers, surfactants for individual use and in combination. We also determined the way in which operational conditions, such as Roi, Rew, the internal and external phase pH values, emulsification mixing speed, time and waste/emulsion mixing rate affected the removal rate of Cr(VI). Note de contenu : - EXPERIMENTAL PROCEDURES : Reagents, instruments and equipment
- RESULTS AND DISCUSSION : Selection and determination of the emulsion liquid membrane system - Carriers - Extracting mechanism of extractants - Surfactant concentration and types - Liquid volume rate in emulsion liquid (Voil/Vwi) - oil internal ratio Roi - Emulsification stirring speed and time - Extraction stirring/rotating speed - Extraction time - External phase pH values - NaOH concentration of internal water phase - Vw/o/Vwe -
- Table 1 : L27(313) orthoganol experimental design - the factors and levels table
- Table 2 : L18(37) orthoganol experimental design - the factors and levels table
- Table 3 : L25(56) orthoganol experimental design - the factors and levels tableEn ligne : This article describes our study on the removal of Cr(VI) with the emulsion memb [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39033
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 2 (03-04/2007) . - p. 52-58[article]The effect of particle size on the characteristics and performance of emulsion binders and topcoats / T. J. Braithwaite in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)
[article]
Titre : The effect of particle size on the characteristics and performance of emulsion binders and topcoats Type de document : texte imprimé Auteurs : T. J. Braithwaite, Auteur Année de publication : 1978 Article en page(s) : p. 82-86 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colloides
Cuirs et peaux -- Finition
Emulsification
Emulsions
Emulsions -- Stabilité
Laque et laquage
Liants
Polymères en émulsion
Polyuréthanes
Taille des particulesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The term emulsion, as applied to coating binders as is known today, is, in fact, a misnomer since by definition an emulsion is a mixture of two or more immiscible liquids, and binders are a mixture of an immiscible solid and a liquid. The correct terminology should thus be a resin dispersion but, for the sake of convenience, will always be referred to as "emulsion".
Aqueous polymers exist as three specific types. These types vary very significantly in both physical and mechani-cal properties. These three types are aqueous dispersions or emulsions, colloidal dispersions and true solutions.
Aqueous dispersions, or emulsions as they are commonly known, can be defined as discrete particles of high molecular weight polymer dispersed in an aqueous medium. The solid polymer is known as the disperse phase, while the water is the disperse medium.
Colloidal dispersions can be considered to be ultra-fine particles or molecular weight intermediates between that of aqueous dispersions and true solutions. The polymers contain polar groups, either acidic or basic, which do impart some degree of solubility. The colloidal dispersions can also be considered as hybrids of dispersions and true solutions, in that they possess properties which are common and characteristic of both types. True solutions, or water reducible resins, are polymers in which polymerisation reactions are performed in water miscible organic solvents such as esters and alcohols, or solubilised by the addition of alkali, i.e. neutralisation. Solubility is also attributed to polar groups on the polymer side chains. The polymers are thus totally soluble in the medium water.
The above generalisation will thus suffice to explain the varions "states" in which aqueous polymers are available. Emulsions find application in the function as binders or topcoats for leather finishing, while colloidal dispersions are used to a smaller extent as thickeners for the finish mixes and more commonly, as pasting adhesives. Water reducible urethane lacquers are also the colloidal dispersions type. True solutions are not currently used in leather finishing but are in the paint industry, particularly the automotive and appliance industries.Note de contenu : - TYPES OF EMULSIONS
- SURFACE ACTIVE AGENTS
- THE EMULSIFICATION PROCESS
- MEASUREMENT OF PARTICLE SIZE DISTRIBUTION : Measurement of particle size distribution : The electron microscope - Sedimentation method - Soap titration method - Light scattering method - General remarks
- THE EFFECT OF PARTICLE SIZE ON THE NATURE OF THE EMULSION, EMULSION POLYMERS AND BINDERS : Emulsion stability - Viscosity - Solids - Nitrocellulose lacquer emulsions
- THE EFFECT OF PARTICLE SIZE ON THE EFFECT OF PARTICLE SIZE ON THE PERFORMANCE OF THE EMULSION-BASED FINISHING SYSTEMS : Properties improved by increasing particle size - Disadvantages of fine particle emulsionsEn ligne : https://drive.google.com/file/d/1EKuMbEz4pgpYU_3wKzkdO2M4Th7KcxAl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35222
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 61 et 62 (Années 1977 et 1978) . - p. 82-86[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008597 - Périodique Archives Documentaires Exclu du prêt The effect of particle size on the characteristics and performance of emulsion binders and topcoats / T. J. Braithwaite in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 62, N° 4 (07-08/1978)
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