Fabrication of graphene-coated poly(glycidyl methacrylate) microspheres by electrostatic interaction and their application in epoxy anticorrosion coatings / Meng Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 383–396 Titre : Fabrication of graphene-coated poly(glycidyl methacrylate) microspheres by electrostatic interaction and their application in epoxy anticorrosion coatings Type de document : texte imprimé Auteurs : Meng Li, Auteur ; Yiyi Li, Auteur ; Jiatian Zhang, Auteur ; Dandan Zhang, Auteur ; Jie Li, Auteur ; Kaibin He, Auteur ; Yiting Xu, Auteur ; Birong Zeng, Auteur ; Lizong Dai, Auteur Année de publication : 2021 Article en page(s) : p. 383–396 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Composites 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. Polyméthacrylate de glycidyle Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : The uneven dispersion of graphene in the resin matrix hinders its application in anticorrosion coatings. This study reports a new method where graphene oxide (GO) is coated on the surface of the poly(glycidyl methacrylate) (PGMA) microspheres to promote the dispersion of GO in epoxy resin (EP) to improve the anticorrosion performance of EP. GO-coated PGMA microspheres (PGMA@GO) were successfully fabricated by electrostatic interaction, which was confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and zeta potential analysis. The scanning electron microscopy results showed that the PGMA microspheres were uniformly coated with GO, when the weight ratio of PGMA@GO was 1:2 (PGMA: GO). Electrochemical impedance spectroscopy and salt immersion experiments were performed to evaluate the corrosion resistance of the EP composite coatings. Comparing with pure EP and GO/EP coatings, the mechanical properties and anticorrosion properties of coatings were improved after adding PGMA@GO. When the addition amount of PGMA@GO (of 50 g EP) was 1.0 wt% and about 0.67 wt% GO was only needed, the PGMA@GO/EP composite coating possessed a high impedance of 5.68 × 108 Ω cm2 and a low breakpoint frequency of 0.39 Hz for 21-day immersion in 3.5 wt% NaCl solution. The anticorrosion mechanism of PGMA@GO/EP composite coating was also discussed. Note de contenu : - EXPERIMENTAL : Materials - Characterizations - Functionalization of graphene oxide - Preparation of PGMA@GO/EP composite coating - RESULTS AND DISCUSSION : Structural properties of PGMA@GO - The optimal weight ratio of PGMA@GO - Characterization of PGMA@GO/EP and GO/EP composite coating - Anticorrosion performance of PGMA@GO/EP and GO/EP composite coating - Anticorrosion mechanism of PGMA@GO/EP composite coating - Table 1 : Main recipes of the anticorrosion composite coatings - Table 2 : Zeta potentials of GO, PGMA, CTAB, PGMA–CTAB, and PGMA@GO (1:2) in deionized water - Table 3 : Low frequency impedance (|Z|0.01Hz) of EP, 1.0% PGMA/EP, 0.5% GO/EP, 1.0% GO/EP, 1.5% GO/EP, 2.0% GO/EP, 0.5% PGMA@GO/EP, 1.0% PGMA@GO/EP, 1.5% PGMA@GO/EP, and 2.0% PGMA@GO/EP composite coatings during different immersion times in 3.5 wt% NaCl solution - Table 4 : Breakpoint frequency (fb) of the composite coatings with different additives DOI : https://doi.org/10.1007/s11998-020-00409-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00409-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35602 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
22701	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Polydopamine functional reduced graphene oxide for enhanced mechanical and electrical properties of waterborne polyurethane nanocomposites / Shengwen Zhang 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. 1333-1341 Titre : Polydopamine functional reduced graphene oxide for enhanced mechanical and electrical properties of waterborne polyurethane nanocomposites Type de document : texte imprimé Auteurs : Shengwen Zhang, Auteur ; Dandan Zhang, Auteur ; Zhen Li ; Yifan Yang ; Meng Sun ; Ziwen Kong ; Yang Wang ; Huiyu Bai ; Weifu Dong Année de publication : 2018 Article en page(s) : p. 1333-1341 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Conduction électrique Matériaux hybrides Nanoparticules Nanoparticules -- Synthèse Oxyde de graphène Polydopamine Polymères en émulsion Polyuréthanes Revêtements -- Propriétés mécaniques Revêtements en phase aqueuse -- Additifs Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne polyurethane/polydopamine (PDA) functional reduced graphene oxide (WPU/PDRGO) nanocomposites were prepared by in situ emulsification method. The presence of a PDA layer and the partial reduction of GO by PDA were confirmed by FTIR, XRD, Raman spectra, and TGA. It was found that the interfacial PDA layers facilitated the dispersion of the PDRGO sheets in the WPU matrix and enhanced mechanical properties of the WPU matrix. The resulting WPU/PDRGO nanocomposite coatings show excellent electrical conductivity (9.9 × 10−6–1.1 × 10−4 S cm−1) corresponding to a PDRGO content of 1–16 wt%. The obtained waterborne polyurethane/graphene nanocomposite dispersions are promising for anticorrosion, antistatic, conductive, and electromagnetic interference shielding coatings. Note de contenu : - EXPERIMENTAL : Materials - Dopamine functinalized and reduction of graphene oxide - Preparation of WPU/PDRGO nanocomposites - Characterization - RESULTS AND DISCUSSION : Functionalization and reduction of GO by dopamine - WPU/PDRGO nanocomposites synthesis and characterization - Mechanical properties of WPU/PDRGO nanocomposite films - Electrical conductivity of the WPU/PDRGO nanocomposite coating - Thermal stability of the WPU/PDRGO nanocomposite films DOI : 10.1007/s11998-018-0082-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0082-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31347 [article]

Réservation

Réserver ce document

Exemplaires (1)

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

---

1 (1 - 2 / 2)