Dispersion is the key to performance / Véronic Landry in EUROPEAN COATINGS JOURNAL (ECJ), N° 07-08/2009 (07-08/2009)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 07-08/2009 (07-08/2009) Titre : Dispersion is the key to performance : Optimising the properties of nanoclay filler in UV-curable coatings Type de document : texte imprimé Auteurs : Véronic Landry, Auteur ; Bernard Riedl, Auteur ; Pierre Blanchet, Auteur Année de publication : 2009 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Matériaux hybrides Nanotechnologie Parquets -- Revêtements protecteurs Résistance des matériaux Réticulation (polymérisation) Index. décimale : 667.9 Revêtements et enduits Résumé : UV cured coatings provide excellent properties, but in the field of floor coatings, fillers are essential increase scratch and wear resistance. Organoclay nanoparticles were dispersed in a typical UV clear formulation by several different methods. Bead milling gave the results, providing faster and more complete curing when using 1-3 % of clay. Hardness, impact resistance and taber abrasion resistance were all improved. En ligne : https://drive.google.com/file/d/1jH_0-Eu2B8uGdBaP4K7iasynPxLZIwIX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5991 [article]

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Effects of surface modification of cellulose nanocrystals (CNCs) on curing behavior, optical, and thermal properties of soybean oil bio-nanocomposite / Nicolas Auclair in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 1 (01/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 1 (01/2020) . - p. 57-67 Titre : Effects of surface modification of cellulose nanocrystals (CNCs) on curing behavior, optical, and thermal properties of soybean oil bio-nanocomposite Type de document : texte imprimé Auteurs : Nicolas Auclair, Auteur ; Alireza Kaboorani, Auteur ; Bernard Riedl, Auteur ; Véronic Landry, Auteur Année de publication : 2020 Article en page(s) : p. 57-67 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Dispersions et suspensions Epoxydation Huile de soja Matériaux hybrides Nanoparticules Réticulation (polymérisation) Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermiques Revêtements organiques Rugosité Stabilité thermique Transition vitreuse Transparence (optique) Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, UV cured bio-nanocomposite coating systems were developed. An acrylated epoxidized soybean oil (AESO) and cellulose nanocrystals (CNCs) were used to make these coating systems. The CNC surface was modified by two different methods so as to achieve good compatibility between the CNC and AESO. Thermal stability, glass transition temperature, optical clarity (transparency), and curing behavior of the coating systems were assessed. The addition of CNC altered the thermal stability of the bio-nanocomposites slightly. Addition of CNC increased glass transition temperature of AESO. This increase was a function of the CNC surface modification method and CNC loading level. The transparency of the bio-nanocomposites was reduced by the addition of CNC. The curing behavior of these coating systems was not significantly different from that of a pure cured AESO matrix. A study of the morphology of the nanocomposite films by AFM demonstrated that the modified CNC had good compatibility with the AESO matrix. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials - Methods - RESULTS AND DISCUSSION : Curing behavior - Thermal stability - Glass transition temperature (Tg) - Transparency - Surface roughness DOI : 10.1007/s11998-019-00237-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00237-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33727 [article]

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Mechanical properties of UV-waterborne varnishes reinforced by cellulose nanocrystals / Vahe Vardanyan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 6 (11/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 6 (11/2014) . - p. 841-852 Titre : Mechanical properties of UV-waterborne varnishes reinforced by cellulose nanocrystals Type de document : texte imprimé Auteurs : Vahe Vardanyan, Auteur ; Bouddah Poaty, Auteur ; Gregory Chauve, Auteur ; Véronic Landry, Auteur ; Tigran Galstian, Auteur ; Bernard Riedl, Auteur Année de publication : 2014 Article en page(s) : p. 841-852 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Dispersions et suspensions Matériaux nanocristallins Polyuréthanes Traîtements de surface Vernis -- Propriétés mécaniques Vernis en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : There are many instances in the literature of nanocellulose-thermoplastic composites, but there are few studies on coatings reinforced by cellulose nanocrystals (CNCs). The overall objective of this research was to develop organic nanoparticles-reinforced UV-water-based coatings for wood applications and to study the effect, mainly on wear properties, of the final composite coatings. CNC was mixed in the varnishes to improve the mechanical properties of the coatings. One of the key aspects in the technology of nanocomposites remains the dispersion of the nanoparticles within the matrix as well as its affinity with the matrix. To quantify the dispersion, efficient methods of characterization are needed in order to reveal the nanosized particles. In this article, a novel characterization method based on atomic force microscopy was employed to characterize such nanocomposite coatings, by measuring surface nanoroughness, which is clearly correlated with quality of dispersion and mechanical properties. CNC was modified by either alkyl quaternary ammonium bromides or acryloyl chloride. The mechanical properties (abrasion and scratch resistances, hardness and adhesion) were analyzed and compared to the reference varnish without nanoparticles. The modified CNC addition in UV-water-based coatings results in an approximately 30–40% increase in wear resistance (abrasion and scratch), without any loss of appearance. Note de contenu : - INTRODUCTION : Waterborne coating - CNC - CNC dispersion characterization - MATERIALS AND EXPERIMENTAL PROCEDURE : The composition of the formulation - CNC - Surface modification of cellulose nanocrystals - Preparation of formulations and samples - Experimental methods - RESULTS AND DISCUSSION : Coating with unmodified CNC - Effect of surface modification of CNC - Mechanical properties of coatings DOI : 10.1007/s11998-014-9598-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9598-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22308 [article]

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Performance of exterior semitransparent PVDF–acrylic coatings / Véronic Landry in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 1 (01/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 1 (01/2013) . - p. 37-46 Titre : Performance of exterior semitransparent PVDF–acrylic coatings Type de document : texte imprimé Auteurs : Véronic Landry, Auteur ; Pierre Blanchet, Auteur ; Luciano Zotig, Auteur ; Tommy Martel, Auteur Année de publication : 2013 Article en page(s) : p. 37-46 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs Fluoropolymères Polyfluorure de vinylidène Résistance au rayonnement ultraviolet Résistance aux conditions climatiques Revêtements en bâtiment Index. décimale : 667.9 Revêtements et enduits Résumé : The purpose of this study was to investigate the performance of a semitransparent PVDF–acrylic coating on two wood species: Black spruce and White pine. An accelerated aging test was performed on the PVDF–acrylic coating and the results obtained were compared with those obtained for a water-based acrylic coating. Color changes were found to be more significant for the acrylic coating, especially after 1000 h of exposure, and for the White pine panels. Infrared spectroscopy revealed that the acrylic resin was more affected by the accelerated aging test than the PVDF resin, although X-ray photoelectron spectroscopy revealed that PVDF was slightly affected at the extreme surface (first 10 nm). Star-shaped defects were found at the surface of the White pine panels finished with the PVDF–acrylic coating. Experiments revealed that the PVDF–acrylic coating does not seem to be flexible enough to sustain resin exudation or other stresses. Note de contenu : - MATERIALS AND METHODS : Materials - METHODS : Accelerated aging test - Colour measurements - X-ray photoelectron spectroscopy - Fourier transform infrared spectroscopy - RESULTS AND DISCUSSION : Color measurements - ATR-FTIR - X-ray photoelectron spectroscopy - 3D profilometry DOI : 10.1007/s11998-012-9421-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9421-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17470 [article]

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Synthesis and incorporation of poly(methyl methacrylate) microspheres with UV stabilizers in wood clear coating binder / Caroline Queant in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1411-1422 Titre : Synthesis and incorporation of poly(methyl methacrylate) microspheres with UV stabilizers in wood clear coating binder Type de document : texte imprimé Auteurs : Caroline Queant, Auteur ; Véronic Landry, Auteur ; Pierre Blanchet, Auteur ; Diane Schorr, Auteur Année de publication : 2017 Article en page(s) : p. 1411-1422 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbeurs de rayonnement ultraviolet Bois -- Revêtements Encapsulation Essais accélérés (technologie) Liants Microsphères Polyacryliques Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Index. décimale : 667.9 Revêtements et enduits Résumé : The durability of clear coatings is an important problem in the coatings industry. This problem can be partly solved with the addition of UV absorbers (UVAs) in the coating formulation. UVAs can absorb part of the UV radiation and convert it into harmless heat. Organic UVAs are prone to photodegradation and can migrate in the binder of a coating formulation. In this study, commercial UVAs have been encapsulated in poly(methyl methacrylate) microspheres using the internal phase separation method. Microspheres have been incorporated into a clear acrylic binder. The acrylic was then applied on wood panels and was placed into an artificial UV chamber. Efficiency of coatings after aging as well as chemical and physical properties were monitored using a colorimeter, FTIR spectroscopy and transmission electron microscopy. This study presents a comparison between the efficiency of free and encapsulated Tinuvin 1130 and 292 commercial absorbers. Results have shown that the coating efficiency is slightly improved when using the encapsulated products. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of PMMA microspheres with Tinuvin 1130 and Tinuvin 292 - Characterization techniques - Introduction in a commercial binder - Accelerated aging tests - Colorimeter - Film absorbance - FTIR - Diffusion tests - RESULTS AND DISCUSSION : DLS and microscopy - Accelerated aging tests results - Film absorbance - FTIR results - Diffusion tests DOI : 10.1007/s11998-017-9943-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9943-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29653 [article]

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Transparent UV-cured clay/UV-based nanocomposite coatings on wood substrates : surface roughness and effect of relative humidity on optical properties / William Nguegang Nkeuwa in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 3 (05/2017)  

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Wood surfaces protected with transparent multilayer UV-cured coatings reinforced with nanosilica and nanoclay. Part I : morphological study and effect of relative humidity on adhesion strength / William Nguegang Nkeuwa in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 3 (05/2014)  

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Wood surfaces protected with transparent multilayer UV-cured coatings reinforced with nanosilica and nanoclay. Part II : Application of a standardized test method to study the effect of relative humidity on scratch resistance / William Nguegang Nkeuwa in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 6 (11/2014)  

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