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Photocured polyacrylate coatings modified by polybutadiene derivatives with multiunsaturated reactive bonds / Jinwei Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 6 (11/2022)
[article]
Titre : Photocured polyacrylate coatings modified by polybutadiene derivatives with multiunsaturated reactive bonds Type de document : texte imprimé Auteurs : Jinwei Wang, Auteur ; Yiyuan Chen, Auteur ; Jiao Ma, Auteur Année de publication : 2022 Article en page(s) : p. 1687-1695 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Maleic anhydride-g-poly(1,2-butadiene) (MLPB) is used as a rubber flexibilizer to modify UV-curable polyacrylate coatings (PA) in an attempt to improve their wear resistance and water tolerance. Fourier transform infrared spectra results show that the unsaturated reactive bonds of MLPB fully participate in the UV-curing reaction and successfully copolymerized with acrylates to obtain robust coatings. The smooth and broad differential scanning calorimeter curves show that the cured systems had good compatibility and their glass transition temperatures (Tg) increase from about 63°C to 74°C with the increase of MLPB addition up to 6 wt%. With the addition of MLPB in PA matrix, their cross-sectional scanning electron microscope (SEM) pictures show brittle features with coarser and dimpled microcracks transforming to toughened fracture morphology with particles offsetting microcrack propagation when MLPB content is added up to 4–6 wt%. The wear scar profiles show that the cross-sectional areas decrease significantly with the MLPB addition, implying the improvement in the wear-resisting ability of PA composite toughened by MLPB; the hardness, impact resistance, and adhesion could be also improved when MLPB was controlled less than 6 wt%. Compared with the pure polyacrylate coatings, the modified coatings exhibited an improvement in water resistance before and after 48-h UV aging. Note de contenu : - EXPERIMENTAL : Materials - Preparation of UV-curable samples - Characterization
- RESULTS AND DISCUSSION : Fourier transforming infrared spectroscopy (FTIR) - Differential scanning calorimetry (DSC) - Scanning electron microscopy (SEM) - Tribological performance - Water absorption
- Table 1 : Hardness, impact resistance, and adhesion data for PA, M2, M4, and M6DOI : https://doi.org/10.1007/s11998-022-00640-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00640-y.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38490
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Code-barres Cote Support Localisation Section Disponibilité 23804 - Périodique Bibliothèque principale Documentaires Disponible Preparation of UV-curable nano-SiO2/ acrylate coatings modified by P-containing LEPB and their applications on plywood / Xiaojing LV in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)
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Titre : Preparation of UV-curable nano-SiO2/ acrylate coatings modified by P-containing LEPB and their applications on plywood Type de document : texte imprimé Auteurs : Xiaojing LV, Auteur ; Jinwei Wang, Auteur ; Yong Guo, Auteur ; Yanxin Guo, Auteur Année de publication : 2023 Article en page(s) : p. 2031-2044 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs
Caractérisation
Composés organiques -- Synthèse
Dioxyde de silicium
Nanoparticules
Phosphore
Polyacryliques
Polybutadiène époxydé
Résistance à l'humidité:Résistance à l'eau
Résistance à l'usure
Résistance à la flamme
Résistance aux taches
Revêtements -- Additifs
Revêtements -- Propriétés mécaniques
Stabilité thermiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Phosphorus-containing liquid epoxidate polybutadiene (PDCP-LEPB) is synthesized and used as a reactive additive to improve the water, wear and fire resistance of UV-curable acrylate coatings containing nano-SiO2 as a filler. The structure of PDCP-LEPB and the curing condition are confirmed by Fourier transform infrared spectroscopy (FTIR). The addition of PDCP-LEPB should be controlled at around 10% as shown by thermal stability measurements; with the addition of PDCP-LEPB, composites show earlier degradation to release flame-retardant components, and thus the fire resistance of plywood is improved when its surface is applied by the composite coatings containing PDCP-LEPB. Besides, the fire protecting ability can be greatly enhanced with SiO2 addition due to the synergistic effect of P, Si and Cl coexistence in the matrix. The addition of PDCP-LEPB improves the water resistance of plywood as reflected by the water absorption rates, contact angle measurements and stain resistance test due to the hydrophobic nature of olefin backbone and increment of crosslinking density; the addition of nano-SiO2 has a much more positive effect on the improvement in their stain resistance and wear resistance due to the increase in surface roughness and stiffness, respectively. Note de contenu :
- EXPERIMENTAL : Materials - Synthesis of PDCP-LEPB - Preparation of UV-curable samples - Characterizations
- RESULTS AND DISCUSSION : Characterization of PDCP-LEPB - Thermal stability and fire resistance evaluation - Water and stain resistance - Mechanical performances
- Table 1 : The mass variations of each formula of modified UV-curable polyacrylates
- Table 2 : Absorption assignments for FTIR spectra of LEPB, PDCP and PDCP-LEPB
- Table 3 : Absorption assignments for FTIR spectra of PDCP-LEPB, neat acrylate and cured composites
- Table 4 : TGA data basedDOI : https://doi.org/10.1007/s11998-023-00799-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00799-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40179
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Code-barres Cote Support Localisation Section Disponibilité 24337 - Périodique Bibliothèque principale Documentaires Disponible The particle size effect of MALPB-DEA dispersions on their anticorrosion performances as waterborne coatings on galvanized sheet / Jinwei Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 1 (01/2011)
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Titre : The particle size effect of MALPB-DEA dispersions on their anticorrosion performances as waterborne coatings on galvanized sheet Type de document : texte imprimé Auteurs : Jinwei Wang, Auteur ; Jinwei Tang, Auteur ; Yedong He, Auteur Année de publication : 2011 Article en page(s) : p. 11-17 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anhydride maléique
Anticorrosifs
Anticorrosion
Diéthanolamine
Dispersions et suspensions
Galvanisation
Polybutadiène
Polymères en émulsion
Revêtements en phase aqueuse:Peinture en phase aqueuse
Taille des particulesIndex. décimale : 667.9 Revêtements et enduits Résumé : Maleic anhydride-g-liquid polybutadiene (MALPB) dispersions were prepared by chemical modification with diethanolamine (DEA) during direct polymer emulsification, and their anticorrosion performances on galvanized sheet were found to be strongly dependent on their particle size and distribution with the variation of DEA. The dispersion containing DEA to maleic anhydride at molar ratio of 2:1 exhibited much smaller particle size and narrower size distribution than that containing DEA to maleic anhydride at molar ratio of 1:1, as measured by a laser diffraction particle size analyzer. A more compact organic layer was supposed to be formed by the dispersion composed of smaller size and narrower size distribution particles on the galvanized sheet, which exhibited better anticorrosive properties. This compact layer slowed down the electrolyte penetration onto the metal surface such that the life span of the metal could be prolonged, which was reflected in the increase in corrosion potential as measured by DC polarization, higher impedance during immersion in 3.5 wt% NaCl solution as measured by electrochemical impedance spectroscopy (EIS), and improved durability in harsh environment as observed by images after salt spray tests. Note de contenu : EXPERIMENTAL : Materials - Preparation of the coatings - Film formation and the curing process - Characterizations.
RESULTS AND DISCUSSION : Particle size and distributions of the dispersions - Electrochemical impedance spectroscopy (EIS) - Salt spray test.DOI : 10.1007/s11998-010-9268-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9268-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10918
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Code-barres Cote Support Localisation Section Disponibilité 012853 - Périodique Bibliothèque principale Documentaires Disponible Top coating of low-molecular weight polymer MALPB used for enhanced protection on anodized AZ31B Mg alloys / Jinwei Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 6 (11/2010)
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Titre : Top coating of low-molecular weight polymer MALPB used for enhanced protection on anodized AZ31B Mg alloys Type de document : texte imprimé Auteurs : Jinwei Wang, Auteur ; Jinwei Tang, Auteur ; Yedong He, Auteur Année de publication : 2010 Article en page(s) : p. 737-746 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anhydride maléique
Anticorrosifs
Anticorrosion
Magnésium -- Alliages
Métaux -- Oxydation anodique
Microscopie électronique à balayage
Polybutadiène
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : A protective composite coating on an AZ31B magnesium alloy was prepared by anodic oxidation to form an oxide layer, followed by single immersion in maleic anhydride-g-liquid polybutadiene (MALPB) solution to cover a polymer coating on top. As a low-molecular weight polymer with low viscosity, MALPB had a tendency to infiltrate into the pores and cracks in the anodic layer to fill the defects among oxides so that a compact layer could be formed after it was cured by its hardeners, as observed by scanning electron microscopy (SEM). This compact layer, which was composed of anodic oxides integrated with solidified MALPB, possessed thickness around 0.7 μm as detected by energy dispersive X-ray (EDX). The anodized, MALPB-coated AZ31B alloy exhibited enhancement in corrosion resistance superior to that separately coated by anodizing oxides or MALPB, as reflected by its much higher corrosion potentials (E ccor) and lower corrosion current density (i corr) in DC polarization tests. Based on electrochemical impedance spectroscopy (EIS) data, we conclude that the anticorrosive performance of the composite coating can be attributed to the barrier effects provided by different layers when the electrolyte passed through the MALPB layer, compact layer, and then the inner anodic layer before it reached the surface of Mg alloy, and that among them, the compact layer acted as a much more effective barrier to the electrolyte. The appearance of damaged areas on the composite coating surface after a much longer duration in a salt spray environment revealed that the life-span of the AZ31B Mg alloy could be greatly prolonged if the pores and cracks on the anodizing films were properly sealed by suitable polymers. DOI : 10.1007/s11998-010-9258-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9258-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10401
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Code-barres Cote Support Localisation Section Disponibilité 012672 - Périodique Bibliothèque principale Documentaires Disponible