Effect of polyethylene wax/soy protein-based dispersion barrier coating on the physical, mechanical, and barrier characteristics of paperboards / Pouya Marzbani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 1 (01/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 1 (01/2021) . - p. 247-257 Titre : Effect of polyethylene wax/soy protein-based dispersion barrier coating on the physical, mechanical, and barrier characteristics of paperboards Type de document : texte imprimé Auteurs : Pouya Marzbani, Auteur ; Mohammad Azadfallah, Auteur ; Maryam Yousefzadeh, Auteur ; Farhood Najafi, Auteur ; Ahmad Ali Pourbabaee, Auteur ; Hanna Koivula, Auteur ; Mikko Ritala, Auteur Année de publication : 2021 Article en page(s) : p. 247-257 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Cartonnages Cires Dispersions et suspensions Polyéthylène Protéines végétales Soja et constituants Index. décimale : 667.9 Revêtements et enduits Résumé : Application of barrier dispersion coatings on paperboards, which must have proper moisture and grease resistance for food applications, has always been an interesting subject for the packaging industry. In this study, paperboards were coated with a novel dispersion barrier coating prepared through mixing soy protein isolate (SPI) and polyethylene wax (PE-wax). Different characterization methods were used to study the effects of coating and its composition on the physical, mechanical, and barrier characteristics of paperboards. The results indicated that the incorporation of PE-wax into the coating formulation caused significant reduction of the viscosity of coating slurries. It had no effect on the coating weight of the samples but increased the thickness of the coated paperboards as compared with those coated with SPI only. The increase of the wax content led to a reduction of 5–16% in the tensile strength values in comparison with the uncoated paperboards. Barrier characteristics, i.e., water vapor permeability (WVP), surface wettability, and water resistance, improved by adding PE-wax. In addition, it was found that there was a critical level for the addition of PE-wax, 50% of SPI, as no oil migration was detected when the paperboards coated with SPI coatings contained less than 50% PE-wax. Note de contenu : - EXPERIMENTAL : Materials - Methods - RESULTS AND DISCUSSION : Solid content and viscosity of coatings - Physical characteristics - Mechanical characteristics - Barrier characteristics - Morphological characteristics - Table 1 : Rheological characteristics of the coatings. The superscript lowercase letters show significant differences. The means followed by the same letter show no significant differences between the treatments - Table 2 : Physical and mechanical characteristics of the paperboard samples. The superscript lowercase letters show significant differences. The means followed by the same letter show no significant differences between the treatments - Table 3 : Barrier characteristics of the paperboard samples. The superscript lowercase letters show significant differences. The means followed by the same letter show no significant differences between the treatments DOI : https://doi.org/10.1007/s11998-020-00403-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00403-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35367 [article]

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Improving fungal decay resistance of solvent and waterborne polyurethane-coated wood by free and microencapsulated thyme essential oil / Seyed Mahmoud Miri Tari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 959-966 Titre : Improving fungal decay resistance of solvent and waterborne polyurethane-coated wood by free and microencapsulated thyme essential oil Type de document : texte imprimé Auteurs : Seyed Mahmoud Miri Tari, Auteur ; Asghar Tarmian, Auteur ; Mohammad Azadfallah, Auteur Année de publication : 2022 Article en page(s) : p. 959-966 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antifongiques Bois -- Revêtements protecteurs Caractérisation Charme (arbre) Carpinus, le Charme, est un genre d'arbres et d'arbustes de la famille des Bétulacées (anciennement de la famille des Corylacées qui est maintenant intégrée aux Bétulacées). Ce genre compte une trentaine d'espèces des régions tempérées de l'hémisphère nord, d'Asie mineure et d'Europe. Ils fournissent un excellent bois de chauffage, du bois de trituration et différents bois de service. Les charmes sont des arbres pouvant mesurer jusqu'à 25 mètres, à feuilles marcescentes, alternes, petites (de 3 à 10 cm de long), simples, avec le bord du limbe finement denté. L'écorce de l'arbre est foncée et souvent grise. Elle est quelquefois marron. Les fruits sont des akènes ligneux de 3 à 6 mm de long, attachés à une bractée en forme de feuille simple ou trilobée qui forme une aile favorisant leur dispersion. (Wikipedia) Encapsulation Huile essentielle de thym 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. Polyuréthanes Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Free and microencapsulated thyme essential oils (Zataria multiflora Boiss) were incorporated into solvent and waterborne polyurethane coatings separately to enhance decay resistance of the biocide free coatings. The essential oil was extracted by hydro-distillation in a Clevenger-type apparatus for 4 h. Poly (methyl methacrylate) (PMMA) microcapsules containing thyme oil as an active ingredient were prepared through solvent evaporation method with oil in water emulsion system. Fungal resistance of the coated hornbeam wood (Carpinus betulus) against white rot fungus Coriolus versicolor CTB 863 A and brown rot fungus Coniophora puteana BAM Ebw. 15 was tested according to European EN 113 standard before and after six-cycle accelerated aging test (ASTM D1037). The results revealed that the core-shell capsules were formed properly, and their sizes were in the range of 5–50 µ. The encapsulation efficiency determined by UV–visible spectrophotometer at λ = 275 nm was 67%. The free essential oil was not efficient enough to improve the fungal resistance, while the microencapsulated oil enhanced the resistance even after the accelerated aging via a controlled-release mechanism as well as protected the susceptible ingredients through the shielding effect of the polymeric shell. Note de contenu : - MATERIALS AND METHODS : Coatings and chemicals - Isolation of essential oil and gas chromatography-mass spectrometry (GC–MS) Synthesis of PMMA microcapsules and their characterization - Measuring encapsulation efficiency - Release kinetics of thyme essential oil - Wood sampling and coating method - Decay and accelerated aging tests - Statistical analysis - RESULTS AND DISCUSSION : Morphology of the microcapsules - Encapsulation efficiency (%) - Release kinetics of thyme oil - Chemical compositions of thyme essential oil - Fungal decay - Table 1 : Chemical compositions of Z. multiflora essential oil - Table 2 : The average mass loss of Carpinus betulus wood specimens coated by biocide-free and biocide-containing solvent-based polyurethane coatings against white rot fungus Coriolus versicolor and brown rot fungus Coniophora puteana before and after an accelerated aging - Table 3 : The average mass loss of Carpinus betulus wood specimens coated by biocide-free and biocide-containing waterborne polyurethane coatings against white rot fungus Coriolus versicolor and brown rot fungus Coniophora puteana before and after an accelerated aging DOI : https://doi.org/10.1007/s11998-021-00573-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00573-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38089 [article]

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Nano-cerium dioxide synergistic potential on abrasion resistance and surface properties of polyurethane-nanocomposite coatings for esthetic and decorative applications on wood / Akbar Mastouri Mansourabad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 6 (11/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 6 (11/2020) . - p. 1559-1570 Titre : Nano-cerium dioxide synergistic potential on abrasion resistance and surface properties of polyurethane-nanocomposite coatings for esthetic and decorative applications on wood Type de document : texte imprimé Auteurs : Akbar Mastouri Mansourabad, Auteur ; Mohammad Azadfallah, Auteur ; Asghar Tarmian, Auteur ; Davood Efhami Sisi, Auteur Année de publication : 2020 Article en page(s) : p. 1559-1570 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Angle de glissement Bois -- Revêtements protecteurs Caractérisation Essais dynamiques Formation de film Oxyde de cérium Polyuréthanes Résistance à l'abrasion Revêtements -- Propriétés optiques Revêtements organiques Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Statistique Synergie Traitement thermique Transition vitreuse Index. décimale : 667.9 Revêtements et enduits Résumé : Development of an antiabrasion and optical shield clearcoat for wooden art and decorative works improves its esthetic durability and lifetime. In this study, the synergistic potentials of cerium dioxide nanoparticles (NPs) were exploited to improve the abrasive, structural, and surface properties of polyurethane (PU)/silica nanocomposite coatings applied on the thermally modified spruce wood. Microhardness, adhesion strength, contact angle, and UV–Vis spectroscopy were used to evaluate the nanocomposite coatings’ surface properties. FE-SEM and EDS techniques were also employed to scrutinize distribution of NPs in the structure of nanocomposite coatings. The results showed that the abrasion resistance significantly improves by increasing the content of silica NPs. However, microhardness and performance of nanocomposite coatings containing a high percentage of silica diminished due to the aggregation of NPs and poor crosslinking of the polymer matrix. The presence of cerium dioxide NPs as a synergistic function in the PU coatings containing nano-silica enhanced the abrasion resistance as well as the glass transition temperature and caused enhanced hardness. Incorporation of cerium dioxide NPs exhibited an incremental effect on the adhesion strength of nanocomposite coatings. However, its presence in high concentration caused an adverse impact on the transparency of the nanocomposite films. In addition, wettability of PU/silica composites remained constant after incorporating high levels of cerium oxide NPs. These findings suggest that use of Ce–Si NPs hybrid/blend in the structure of PU coatings can assure the durability of wood coatings for esthetic applications and interior decoration by strengthening the surface, mechanical, and optical properties. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials - Preparation of nanocomposite coatings - Differential scanning calorimetry (DSC) - Microhardness and adhesion strength measurements - Scanning electron microscopy (SEM) studies - Optical properties - Abrasion resistance and film thicknesses on wood - Contact angle - Statistical analysis - RESULTS AND DISCUSSION : Glass transition temperature (Tg) - Microhardness - Adhesion strength - SEM and EDS - Nanocomposite film formation - Abrasion resistance - Optical properties of coated wood and nanocomposite films - Contact angle DOI : https://doi.org/10.1007/s11998-020-00374-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00374-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34960 [article]

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