| Titre : |
Microencapsulation techniques and their potential in self-healing coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Sakshi Arora, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 55-66 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Core-Shell
Inhibiteurs (chimie)
Revêtement autoréparant
Revêtement autoréparant:Peinture autocicatrisante
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Microencapsulation can be described as the process of enclosing micron-sized particles of solids or droplets of liquids or gases in an inert shell in order to isolate and protect them from the external environment. The concept of encapsulation of materials is inspired from micro to macro-scale examples in the nature like a seed or a cell for protection against environmental impacts. This technology can be used for valuable applications requiring controlled and targeted release, masking odors and protection of reactive or sensitive additives used for different applications. The fabrication of microcapsules can been attained by chemical, physico-chemical and physico-mechanical processes depending on the nature of the core and the shell materials, efficiency of encapsulation and the shell thickness required. The microencapsulation has found application in numerous fields like adhesives, carbonless copy paper, phase change materials, perfumes with its growing technical readiness for use in the protective coatings. The microcapsules based on shell made up of thermoset resins containing healing agents of different chemical nature (inhibitors) have been investigated to serve as self-healing coatings. This paper reviews the different techniques used for microencapsulation and their applications with an emphasis on its use for the self-healing coatings. |
| Note de contenu : |
- SYNTHESIS OF MICROCAPSULESynthesis of microcapsules
- CHEMICAL METHODS : Interfacial polymerization
- IN-SITU POLYMERIZATION
- PHYSICO-CHEMICAL METHODS : Layer-by-layer (LBL) - Rapid expansion of supercritical fluids
- PHYSICO-MECHANICAL PROCESSES : Co-extrusion
- SPRAY-DRYING : Top spray - Tangential spray - Spinning disk - Microcapsules for the self-healing coatings - Two component system - Single component system - Application microcapsules in the coating
- Fig. 1 : Cost and complexity comparison of different encapsulation techniques)
- Fig. 2 : Schematic representation of microcapsule
- Fig. 3 : Morphology of microcapsules
- Fig. 4 : Techniques used for microencapsulation
- Fig. 5 : Interfacial polymerization process for microcapsule fabrication
- Fig. 6 : In-situ polymerization process for microcapsule formation
- Fig. 7 : Urea-formaldehyde capsules containing dicyclopentadiene healing agent
- Fig. 8 : Coacervation process for microcapsule formation a. Dispersion of core material in the shell polymer solution b. Separation of polymer rich phase (Coacervate) c. Coating of core material by microdroplets of the coacervate d. Coalescence of coacervate to form continuous shell around the core particles
- Fig. 9 : Layer-by-layer methodology
- Fig. 10 : SiO, nanocontainers and its incorporation in Zr0,/SiO, coating
- Fig. 11 : Microencapsulation by Rapid Expansion of Supercritical Solution (RESS)
- Fig. 12 : Microencapsulation by co-extrusion process
- Fig. 13 : Microencapsultion by spray-drying process
- Fig. 14 : Schematic representation of three types of spraying chamber
- Fig. 15 : Microencapsulation by spanning disk action
- Fig. 16 : Application of microcapsules in coatings
- Table 1 : Particle sizes obtained from differentm icroencapsulation processes
- Table 2 : Two-component healing systems
- Table 3 : Single component healing systems
- Table 4 : Sample matrix as analyzed by Kumar et al |
| En ligne : |
https://drive.google.com/file/d/1Ewtp9LSvoV6wMDtCuXL9TlueLm9-6T-m/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35201 |
in PAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 55-66
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Microencapsulation techniques and their potential in self-healing coatings in PAINTINDIA, Vol. LXX, N° 12 (12/2020)
