An overview of the science and art of encapsulated pigments : Preparation, performance and application / Benjamin Tawiah in COLORATION TECHNOLOGY, Vol. 138, N° 3 (06/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 3 (06/2022) . - p. 224-247 Titre : An overview of the science and art of encapsulated pigments : Preparation, performance and application Type de document : texte imprimé Auteurs : Benjamin Tawiah, Auteur ; Benjamin K. Asinyo, Auteur ; Charles Frimpong, Auteur ; Ebenezer K. Howard, Auteur ; Raphael K. Seidu, Auteur Année de publication : 2022 Article en page(s) : p. 224-247 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Complexation (chimie) Couches minces multicouches Dispersions et suspensions Encapsulation Essais (technologie) Evaluation Pigments Polymérisation Séparation de phases Sol-gel, Procédé Index. décimale : 667.2 Colorants et pigments Résumé : A successfully encapsulated pigment requires dispersants, pigment and a dispersion medium to build a thin layer of polymer over individual pigment particles. The stability of encapsulated dispersion is aided by the absorption of stabilising molecules on the surface. The stabilising molecules function by steric hindrance or Coulomb-repulsion forces, which prevent the encapsulated pigments from advancing too close to each other for attractive forces to cause agglomeration. Unlike flocculation, agglomeration results in a cementitious network structure that is not easily redispersed by shear forces, hence the need for effective dispersion of encapsulated pigment intended for engineering applications. Besides dispersion forces, the quality of pigment dispersion, the pigment particle size, pigment density, viscosity of the dispersion, and the method of producing the pigment microcapsules, also affect the efficiency and the quality of encapsulated pigment dispersions. This article, therefore, provides up-to-date information on the various pigment encapsulation methods (with specific emphasis on phase separation, in situ polymerisation, emulsion and mini-emulsion polymerisation, the sol-gel method, inclusion complexation and layer-by-layer assembly), and also reviews the performance, the evaluation/test methods and applications of encapsulated pigments. This review provides important insight into the science and art of encapsulated pigment preparation for pigment dispersion technologists, researchers and consumers of pigment products in different fields of endeavour. Note de contenu : - METHODS OF ENCAPSULATION : Preparation of encapsulated pigment dispersion - Physico-chemical methods - Chemical methods - INCLUSION COMPLEXATION - PERFORMANCE OF ENCAPSULATED PIGMENT DISPERSIONS : Stability - Rheological behavior - COLOUR PERFORMANCE OF ENCAPSULATED PIGMENT DISPERSION - EVALUATION METHODS FOR ENCAPSULATED PIGMENT DISPERSION - APPLICATIONS OF ENCAPSULATED PIGMENT DISPERSION : Emerging applications of encapsulated pigments - Table 1 : Encapsulation methods suitable for different ranges of capsule size - Table 2 : Selected studies in in situ polymerisation - Table 3 : Advantages and limitations of some conventional encapsulation methods applicable different types of pigments - Table 4 : Test methods for evaluating encapsulated pigment dispersion - Table 5 : Application of encapsulated pigments DOI : https://doi.org/10.1111/cote.12597 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12597 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37853 [article]

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Novel procedure for polymer coatings of nanoscopic surface topology / C. D. Eisenbach in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B3 (09/2005)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 88, B3 (09/2005) . - p. 213-216 Titre : Novel procedure for polymer coatings of nanoscopic surface topology Type de document : texte imprimé Auteurs : C. D. Eisenbach, Auteur ; M. Entenmann, Auteur ; Thadeus Schauer, Auteur Année de publication : 2005 Article en page(s) : p. 213-216 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymères séquencés Revêtements organiques Séparation de phases Transition de phase En physique, une transition de phase est une transformation du système étudié provoquée par la variation d'un paramètre extérieur particulier (température, champ magnétique...). Cette transition a lieu lorsque le paramètre atteint une valeur seuil (plancher ou plafond selon le sens de variation). La transformation est un changement des propriétés du système. Index. décimale : 667.9 Revêtements et enduits Résumé : A new coating technique based on the so-called lower critical solution temperature (LCST) phase transition phenomena known from polymer solutions has been studied. Contrary to the commonly-known features that precipitation from solution occurs upon cooling (or solvent evaporation) or by a precipitant, LCST behaviour means a coagulation and precipitation of the polymer from solution upon heating, once a critical temperature is exceeded. This technology not only allows a controlled surface modification of pigments or flat substrates by an organic polymer coating layer, but also allows one to introduce specific surface features of nanoscopic to mesoscopic dimensions. The surface topology may be reversibly varied from a regular, almost close-packed, mesoscopic hemisphere texture to a nanoscopic roughness or rendered evenly smooth. DOI : 10.1007/BF02699575 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699575.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5418 [article]

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Phase separation in Michael addition curable coatings to enhance flexibility and adhesion robustness / Bart A. J. Noordover in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1835-1844 Titre : Phase separation in Michael addition curable coatings to enhance flexibility and adhesion robustness Type de document : texte imprimé Auteurs : Bart A. J. Noordover, Auteur ; Yujing Zhang, Auteur ; Richard Brinkhuis, Auteur ; Martin Bosma, Auteur ; Florian Lunzer, Auteur ; Patrice Roose, Auteur ; Luc Lindekens, Auteur Année de publication : 2023 Article en page(s) : p. 1835-1844 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Analyse thermomécanique dynamique Caractérisation Formulation (Génie chimique) Michael, Addition de L'addition de Michael ou réaction de Michael est une réaction qui permet la création de liaisons carbone-carbone, voire de liaisons carbone-soufre. Il s'agit de l'addition nucléophile d'un carbanion sur un composé carbonylé α,β insaturé (aldéhyde, cétone et même ester α,β insaturé, des nitriles et des amides α,β insaturés pouvant aussi être utilisés). Elle appartient à la famille des additions nucléophiles conjuguées. Cette réaction doit son nom au chimiste américain Arthur Michael. Polyester maloné Réticulation (polymérisation) Revêtements organiques Séparation de phases Souplesse (mécanique) Vernis -- Propriétés mécaniques Index. décimale : 667.7 Cires, laques, vernis Résumé : Polyether-based acryloyl-functional acceptor binders were combined with malonated polyester donor resins in base-catalyzed carbon-Michael addition curable paint systems. The high equivalent weight, flexible polyether-based acceptors afford a multi-phase morphology in the final coating film, which is formed through polymerization-induced incompatibility and phase separation. Additional thermal transitions were observed in dynamic mechanical thermal analysis experiments, indicating the presence of low Tg domains in the highly crosslinked continuous phase. As a consequence, these novel network compositions show strongly improved ductility and adhesion robustness over a range of substrate types. Non-reactive polyether-based binders, lacking covalent bonding to the crosslinked continuous phase, only lead to limited, less robust property improvement. It was demonstrated that acceptor binders based on poly(propylene glycol) segments are highly effective in enhancing flexibility while maintaining a high coating hardness. Both clearcoat and pigmented topcoat formulations were developed showing similar performance improvements, opening the door to benefits in a variety of application fields. Note de contenu : - Experimental section : Materials - Preparation of malonated polyester MPE1 - RMA coating formulation and application - Characterization methods - Results and discussion : Polymerization-induced phase separation using acryloyl-functional polyethers - Mechanical and adhesion properties of multi-phase RMA curable compositions - RMA reactive vs non-reactive polyether segments - Reactive polyether-containing pigmented RMA curable compositions - Table 1 : Michael addition curable clearcoat formulation containing PPG2k UA - Table 2 : Polyether-based UAs studied in RMA coatings - Table 3 : Testing results of multi-phase RMA curable compositions - Table 4 : Testing results of multi-phase RMA curable compositions - Table 5 : Adhesion testing results on different types of substrates for pigmented Michael addition curable compositions based on MPE and DiTMPTA + acceptor resin 2 (% on total resin solids), using a carbonate-blocked strong base as catalyst DOI : https://doi.org/10.1007/s11998-023-00804-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00804-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40164 [article]

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Polymer blend formulation and processing, with reference to the nature and the behaviour of pigmented polycarbonate — poly(butylene terephthalate) (PC-PBT) blends / K. E. Fagelman in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B1 (03/2006)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 89, B1 (03/2006) . - p. 1-14 Titre : Polymer blend formulation and processing, with reference to the nature and the behaviour of pigmented polycarbonate — poly(butylene terephthalate) (PC-PBT) blends Type de document : texte imprimé Auteurs : K. E. Fagelman, Auteur ; James Thomas Guthrie, Auteur Année de publication : 2006 Article en page(s) : p. 1-14 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Formulation (Génie chimique) Polybutylène téréphtalate Polycarbonates Polymères -- Additifs Séparation de phases Index. décimale : 667.9 Revêtements et enduits Résumé : Polymers, and even more so polymer blends, are selected for their particular properties and processing characteristics. It is often necessary to include additives in the polymer formulations, either to facilitate processing, or to extend the life of the polymeric product that is created. Colourants are additives that are principally used for aesthetic purposes. However, the addition of a colourant to a thermoplastic system can lead to unexpected and sometimes detrimental changes in the material properties of that system. In this review, the general characteristics of polymer blends and the processes involved in manufacturing them are discussed. Additives that may be included in the formulation and the interactions that can arise among the blend components are also described. The relevance of these components and processes are then discussed in regard to blends of polycarbonate and poly(butylene-terephthalate). Note de contenu : - INTRODUCTION : Polymer blends - Additives for polymer blends and general additive use - Additive interactions in polymers blends - Interactions and reactions in composite blends - CRYSTALLISATION AND NUCLEATION OF POLYMERS - POLYCARBONATE (PC) - POLY(BUTYLENE TEREPHTHALATE) (PBT) BLENDS : Morphology and morphology development - Mechanical behaviour - The transesterification reaction between PC and PBT - Table 1 : Properties associated with the engineering polymers that are produced by GE Plastics DOI : 10.1007/BF02699609 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699609.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5390 [article]

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Reaction-driven solvent transport in UV-curable phase-separating coatings in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 1 (01/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 1 (01/2023) Titre : Reaction-driven solvent transport in UV-curable phase-separating coatings Type de document : texte imprimé Année de publication : 2023 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fourier, Spectroscopie infrarouge à transformée de Lumière -- Diffusion Microscopie électronique à balayage Photoréticulation Polyester acrylate Réaction de couplage Réflexion totale atténuée Revêtement en phase solvant Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Séparation de phases Index. décimale : 667.9 Revêtements et enduits Résumé : We experimentally examined the time-evolutions of local compositions in photocurable, monomer-solvent-initiator ternary liquid film coatings using attenuated total-reflectance-Fourier transform infrared spectroscopy. The coatings exhibited phase separation upon UV exposure owing to the inherent partial miscibility between the solvent and the polymer. The solvent concentration at the bottom of the coating increased when exposed to UV light for 1 s from the top, showing a solvent transport along the irradiation direction. The differences in solvent concentration before and after UV exposure showed good agreement with model predictions based on stress-induced non-Fickian solvent mass transport. The solvent concentrations at the bottom remained constant in the case of discrete phase structures, whereas it exponentially decayed over time in bicontinuous phase structures. These results suggest that light-tunable microstructures enable the relaxation of the reaction-driven nonuniformity in solvent concentration distributions. Note de contenu : - Materials - Attenuated total reflectance-Fourier transform infrared (ATR-FTIR) analysis - Scanning electron microscopy - Light scattering analysis - Table 1 : Material constants to express A1363/A981 as a cubic function with respect to the solvent mass fraction DOI : https://doi.org/10.1007/s11998-022-00661-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00661-7.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38778 [article]

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Self-stratifying coatings - A potential smart coating for future / Atul Ahire in PAINTINDIA, Vol. LXXII, N° 11 (11/2022)  

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