Preparation of UV-opaque, Vis-transparent acrylic–silica nanocomposite coating with promising physico-mechanical properties via miniemulsion polymerization / Ali Gharieh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 3 (05/2019) . - p. 781-789 Titre : Preparation of UV-opaque, Vis-transparent acrylic–silica nanocomposite coating with promising physico-mechanical properties via miniemulsion polymerization Type de document : texte imprimé Auteurs : Ali Gharieh, Auteur ; Abdolreza Mirmohseni, Auteur ; Manouchehr Khorassani, Auteur Année de publication : 2019 Article en page(s) : p. 781-789 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Latex Matériaux hybrides Miniémulsions Nanoparticules Opacité (optique) Polyacryliques Polymérisation en émulsion Revêtements -- Propriétés mécaniques Revêtements -- Propriétés optiques Revêtements -- Propriétés physiques Revêtements en phase aqueuse 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. Transparence (optique) Index. décimale : 667.9 Revêtements et enduits Résumé : Here, waterborne coatings with enhanced physico-mechanical properties were prepared by incorporation of modified silica nanoparticles into an acrylic matrix through miniemulsion polymerization. In order to circumvent the inherent incompatibility of organic and inorganic portions, methylene diphenyl diisocyanate and 2-hydroxyethyl methacrylate molecules were chemically coupled to the surface of silica nanoparticles to alter the hydrophilic nature of inorganic nanoparticles to hydrophobic ones. Also, for investigating the effect of the exploited surface modification process, unmodified silica nanoparticles were used in preparing acrylic latex via miniemulsion polymerization. The optical and physico-mechanical properties of the acrylic–silica nanocomposite films with 0–10 wt% of unmodified and modified SiO2 were characterized by measuring their surface roughness, haziness, gloss values, UV–Vis transmittance, scratch resistance, tensile, and pendulum hardness. It was found that by using modified SiO2 nanoparticles, due to their better dispersion state and ability for establishing covalent linkage with acrylic polymer chains, it is possible to obtain nanocomposite coatings with improved physico-mechanical properties, high transparency in Vis region, considerable UV adsorption, and comparable surface roughness, glossiness, and haziness with pure acrylic film. However, unmodified silica nanoparticles formed many aggregates in the polymer matrix which deteriorated optical and different physico-mechanical properties of acrylic latex. It was found that the greatest improvement in properties is achieved by incorporation of 7 wt% modified silica nanoparticles in acrylic polymer. Note de contenu : - EXPERIMENTAL : Materials - Chracterization - Preparation of silica-acrylic nanocomposite latexes - RESULTS AND DISCUSSION : Optical properties - Physico-mechanical properties DOI : 10.1007/s11998-018-00155-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00155-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32590 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
20953	-	Périodique	Bibliothèque principale	Documentaires	Disponible

A promising ternary nanohybrid of Copper@Zinc oxide intercalated with polyaniline for simultaneous antistatic and antibacterial applications / Abdolreza Mirmohseni in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1411-1422 Titre : A promising ternary nanohybrid of Copper@Zinc oxide intercalated with polyaniline for simultaneous antistatic and antibacterial applications Type de document : texte imprimé Auteurs : Abdolreza Mirmohseni, Auteur ; Maryam Azizi, Auteur ; Mir Saeed Seyed Dorraji, Auteur Année de publication : 2019 Article en page(s) : p. 1411-1422 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Antistatiques Cuivre Essais d'adhésion Matériaux hybrides Oxyde de zinc Polymères en émulsion Polyuréthanes Résistance à l'abrasion Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, a facile and cost-effective approach has been developed for fabricating antibacterial and antistatic waterborne polyurethane (WPU)-based coatings by using Polyaniline-Copper@Zinc oxide (P-Cu@ZnO) ternary nanohybrid as a multifunctional additive. The solid-state reaction of copper acetate and zinc acetate salts led to the synthesis of copper clusters on the ZnO nanoparticles (Cu@ZnO). The obtained Cu@ZnO nanoparticles were intercalated with polyaniline (PANI) chains to prepare the P-Cu@ZnO nanohybrid. FTIR, XRD, UV–Vis, and FESEM analyses were used to characterize the structural, crystallographic, and morphological properties of the synthesized nanohybrid. Adding P-Cu@ZnO nanohybrid to the WPU matrix not only improved adhesion strength of the coatings but also enhanced their scratch resistance compared to the pristine WPU coating. Moreover, incorporation of the obtained nanohybrid into the WPU coatings caused electrical surface resistance of the obtained coatings to reach 1.2 × 10+8 Ω/sq, so, these coatings gained the optimum electrical surface resistance to be counted as an antistatic coating. Also, the results of the colony counting test showed that the modified coatings could reduce the Staphylococcus aureus and Escherichia coli bacteria growth by about 86% and 74%, respectively. Note de contenu : - EXPERIMENTAL : Materials - Prepration of copper decorated zinc oxide (Cu@ZnO) - Synthesis of pure polyaniline (PANI) and polyaniline-copper@zinc oxyde ternary nanohybrid (P-CU@ZnO) - Preparation of waterborne polyurethane dispersion (WPUs) - Preparation of modified waterborne polyurethane coatings - Characterization of polyaniline-copper@Zinc oxide ternary nanohybrid - Confirmation of the presence of Cu clusters in Cu@ZnO nanoparticles by UV-vis study - The proposed mechanism for the formation of copper clusters on the zinc oxide - Evaluation of the coatings' adhesion strength and scratch resistance - Antistatic behavior of waterborne polyurethane based coatings - Investigating antibacterial activity of the waterborne polyurethane coatings DOI : 10.1007/s11998-019-00223-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00223-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33021 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
21154	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 2 / 2)