Cellulose nanocrystal (CNC)-based nanocomposites for UV curable high-solid coating systems / Alireza Kaboorani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 5 (09/2017) . - p. 1137-1145 Titre : Cellulose nanocrystal (CNC)-based nanocomposites for UV curable high-solid coating systems Type de document : texte imprimé Auteurs : Alireza Kaboorani, Auteur ; Nicolas Auclair, Auteur ; Bernard Riedl, Auteur ; Omid Hosseinaei, Auteur ; Siqun Wang, Auteur Année de publication : 2017 Article en page(s) : p. 1137-1145 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Vernis 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. Copolymère époxy acrylate Cristaux Haut extrait sec Hydrophobie Nanoindentation Nanoparticules Revêtements -- Séchage sous rayonnement ultraviolet Revêtements intérieurs Rugosité Stabilité thermique Statistique Vernis -- Propriétés mécaniques Index. décimale : 667.9 Revêtements et enduits Résumé : Demand for durable clear wood coatings is on the rise. Cellulose nanocrystals (CNC) constitute an organic nanomaterial widely studied in polymer composites for its reinforcing effect. In this study, CNC was used to enhance the performance of a UV curable high-solid content coating system intended for indoor environments. The CNC surface was modified by a cationic surfactant since the coating system was hydrophobic resin-based requiring hydrophobic nanomaterial reinforcement. Modified CNC was mixed with the coating system using a high-speed mixer and the ultrasonication technique. Mechanical, thermal and morphological properties and curing behavior of the newly developed UV-curing coatings were assessed. Inclusion of CNC in the coating increased the mechanical properties (hardness and reduced modulus) of the coating system to a large extent. Thermal stability of the coating system was also improved by CNC addition. The CNC did not affect the curing behavior of the coating, in contrast to most inorganic nanomaterials. The CNC dispersed well in the matrix at 1% loading. Results of this study show that CNC can be used successfully with high-solid content coating systems. Note de contenu : - EXPERIMENTAL : Materials - METHODS : CNC surface modification - Preparation of UV-curable formulations - CHARACTERIZATIONS : Thermal stability - Photodifferential scanning calorimetry (photo-DSC) - Atomic force microscopy (AFM) - Nanoindentation - Statistical analyses - RESULTS : Thermal stability - Surface roughness - Curing behavior - Mechanical properties DOI : 10.1007/s11998-017-9929-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9929-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29148 [article]

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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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Effect of addition of cellulose nanocrystals to wood coatings on color changes and surface roughness due to accelerated weathering / Vahe Vardanyan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 2 (03/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 2 (03/2015) . - p. 247-258 Titre : Effect of addition of cellulose nanocrystals to wood coatings on color changes and surface roughness due to accelerated weathering Type de document : texte imprimé Auteurs : Vahe Vardanyan, Auteur ; Tigran Galstian, Auteur ; Bernard Riedl, Auteur Année de publication : 2015 Article en page(s) : p. 247-258 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois 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. Copolymère uréthane acrylate Couleurs -- Stabilité Cristaux Essais accélérés (technologie) Formulation (Génie chimique) Nanoparticules Revêtements -- Propriétés mécaniques Revêtements en phase aqueuse -- Séchage sous rayonnement ultraviolet Revêtements:Peinture Rugosité Vernis en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : An aqueous ultraviolet-cured polyurethane acrylate transparent resin formulation was submitted for accelerated weathering for 1200 h, on wood substrate, with and without added cellulose nanocrystals (CNC) in coatings. In previous work, addition of CNC improved several mechanical properties of the coating without changing other desirable properties such as optical transparency, color, and gloss. Measurements of nanoroughness were performed with atomic force microscopy on coated weathered surfaces. Surface roughness increased 8–10 times following weathering. Color and lightness measurements were done periodically, each 100 h, during the weathering. Testing was also done for a multilayer coating, varnish on an opaque coating on wood. Addition of unmodified, i.e., hydrophilic, CNC to transparent coatings did not downgrade the color stability of coatings but actually increased their color stability, while the effect on hydrophobically modified CNC was somewhat less. Thus, addition of CNC to coatings not only increases mechanical properties but also increases color stability of coated wood. Note de contenu : - INTRODUCTION AND LITERATURE REVIEW : Effect of UV/humidity on color wood surfaces - Effect of UV/humidity on color of coated wood - Effect of addition of nanoparticles in coatings - EXPERIMENTAL : Varnish formulation - Wood samples preparation - Accelerated weathering - RESULTS AND DISCUSSION : Wheathering of varnishes with added CNC : color and appearance - Wheathering of paints with added CNC : color and appearance - Changes in roughness following wheathering : AFM profiles DOI : 10.1007/s11998-014-9634-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9634-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23644 [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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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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UV-waterborne polyurethane-acrylate nanocomposite coatings containing alumina and silica nanoparticles for wood : mechanical, optical, and thermal properties assessment / Caroline Sow in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 2 (03/2011)  

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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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