Mechanical-induced functionalization of graphene with sodium carboxymethyl cellulose toward enhancing anticorrosion performance of waterborne epoxy coatings / Rui Wang 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. 2069-2080 Titre : Mechanical-induced functionalization of graphene with sodium carboxymethyl cellulose toward enhancing anticorrosion performance of waterborne epoxy coatings Type de document : texte imprimé Auteurs : Rui Wang, Auteur ; Hongling Yi, Auteur Année de publication : 2023 Article en page(s) : p. 2069-2080 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption Anticorrosifs Anticorrosion Caractérisation Carboxyméthylcellulose de sodium Dispersions et suspensions Epoxydes Graphène Le graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur. Revêtements -- Propriétés mécaniques Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Non-covalent modification of graphene is prepared by sodium carboxymethyl cellulose via ball milling. Adsorption and thermogravimetric analyzer (TG) indicate interaction of graphene with sodium carboxymethyl cellulose. Particle size and zeta potential results show sodium carboxymethyl cellulose with high DS play more role in assisting stabilization of graphene dispersion. The adsorption of sodium carboxymethyl cellulose onto graphene is inhibited under acidic conditions and the dispersion stability deteriorates sharply. Under neutral and alkaline conditions, the dispersions maintain stable. Embedding a small percentage of well-dispersed graphene nanosheets (CGr1.5%) in waterborne epoxy coating has remarkably improved anticorrosion performance, which is attributed to the synergistic effects of barrier properties of well-dispersed graphene nanosheets and CMC in the epoxy matrix. Open circuit potential (OCP), Tafel and electrochemical impedance spectroscopy (EIS) analysis confirmed that the corrosion rate exhibited by composite coatings with 1.5 wt% graphene is lower than that of neat epoxy coating. Note de contenu : - EXPERIMENTAL : Materials - Adsorption measurements - Preparation of CMC-graphene dispersion - Fabrication of coatings - Testing and characterization - RESULTS AND DISCUSSION : Adsorption isotherm for CMC on graphene with different degree of substitution (DS) - TGA - Particle size distribution - Effect of CMC substitution degree on zeta potential of graphene dispersions - Morphology - Effect of pH on CMC graphene dispersion stability - Coating mechanical properties - Table 1 : Parameters of adsorption isotherm models of CMC with different DS - Table 2 : Mechanical properties of CMC-graphene epoxy coatings Coating corrosion resistance - Table 3 : Polarization parameters of coatings with different CGr contents in 3.5% NaCl solution DOI : https://doi.org/10.1007/s11998-023-00802-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00802-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40182 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
24337	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Preparation and properties of hybrid epoxy/hydro-terminated polybutadiene/modified MMT nanocomposites / Hongling Yi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1413-1422 Titre : Preparation and properties of hybrid epoxy/hydro-terminated polybutadiene/modified MMT nanocomposites Type de document : texte imprimé Auteurs : Hongling Yi, Auteur ; Ting Wei, Auteur ; Heng Lin ; Junjie Zhou Année de publication : 2018 Article en page(s) : p. 1413-1422 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites -- Propriétés mécaniques Epoxydes Montmorillonite Nanostructures Polybutadiène Polymères à terminaison hydroxyle Rupture (mécanique) Index. décimale : 667.9 Revêtements et enduits Résumé : The effects of hydroxyl-terminated polybutadiene (HTPB) number average molecular weight ( \overline{{\boldsymbol{M\fancyscript{n}}}} ) and preparation temperature on montmorillonite (MMT) intercalation/exfoliation behavior were investigated. X-ray diffraction and Fourier transform infrared spectroscopy results indicated that 40 to 80°C were the preferred temperatures to obtain nanostructured HTPB/MMT. The higher \overline{{\boldsymbol{M\fancyscript{n}}}} (> 2800) of HTPB led to a more exfoliated nanostructure than lower \overline{{\boldsymbol{M\fancyscript{n}}}} as proven by transmission electron microscopy. The tensile strength, tensile modulus, and elongation at break of nanostructured HTPB/MMT/EP ternary composites were higher than those of the HTPB/EP binary blend, which was due to the HTPB/MMT hybrid structure. The effect of increasing molecular weight on impact strength in the ternary system was less than that in the binary system. The HTPB/MMT/epoxy hybrid composites with low concentration could improve the impact strength, which was due to the superposition effect of organic/inorganic nanostructures. In hybrid HTPB/MMT/epoxy composite system, the toughening was attributed to the slow crack growth and fast crack growth, and the dissipated energy of pulling or debonding nanoclay out from the matrix also contributed. Note de contenu : - EXPERIMENTAL WORK : Materials - Preparation of HTPB/MMT composites - Preparation of HTPB-EP binary blend and HTPB/MMT/EP ternary composites - Analysis and characterization - RESULTS AND DISCUSSION : Preparation of nanostructured MMT/HTPB - The mechanical properties of EP composites - Fracture morphology and failure mechanisms DOI : 10.1007/s11998-018-0093-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0093-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31362 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
20388	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 2 / 2)