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Field study on the effect of acidic conditions on the adhesion of paint to western redcedar / Mark T. Knaebe in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 856 (05/1996)
[article]
Titre : Field study on the effect of acidic conditions on the adhesion of paint to western redcedar Type de document : texte imprimé Auteurs : Mark T. Knaebe, Auteur ; R. Sam Williams, Auteur ; John W. Spence, Auteur Année de publication : 1996 Article en page(s) : p. 27-30 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Conifères
Pluies acides
Revêtements
Revêtements -- Effets du climatIndex. décimale : 667.9 Revêtements et enduits Résumé : Previous research results involving sulfur accumulation on cross sections of wood coated with latex paint led us to investigate whether acidic conditions could affect the bonding strength of paint and be a factor in catastrophic paint peeling. Through simulation of acidic dew under outdoor conditions, the study reported herein determined the effect of acid rain and/or dew on painted wood siding. Painted wood was soaked before dawn in various acid solutions for two hours each day, then exposed outdoors for the remainder of the day and night during the summer near Madison, WI. From October to May, the specimens were exposed but not soaked. After four years of exposure to weather and acid, only the painted wood interface for specimens soaked in sulfurous acid at pH 2 indicated deterioration as measured by fracture toughness testing. Note de contenu : - EXPERIMENTAL : Acid solution - Western redcedar panels - Specimens for machanical testing Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18475
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 856 (05/1996) . - p. 27-30[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 003526 - Périodique Bibliothèque principale Documentaires Exclu du prêt Study of the attack of acidic solutions on melamine-acrylic basecoat/clearcoat paint systems / W. R. Rodgers in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 877 (02/1998)
[article]
Titre : Study of the attack of acidic solutions on melamine-acrylic basecoat/clearcoat paint systems Type de document : texte imprimé Auteurs : W. R. Rodgers, Auteur ; D. P. Garner, Auteur ; G. D. Cheever, Auteur Année de publication : 1998 Article en page(s) : p. 83-95 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automotile -- Peinture -- Détérioration
Couches minces
MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde.
Pluies acides
Polyacryliques
Primaire (revêtement)
Revêtements -- Analyse
Vernis -- AnalyseIndex. décimale : 667.9 Revêtements et enduits Résumé : The extent of penetration of an acidic solution into a melamine-acrylic coating, the bulk changes in the thermal properties of the coating, and the chemistry and kinetics of acid degradation were investigated. Fluorescent microscopy experiments showed that significant penetration of the clearcoat occurs rapidly with acidic solutions. Thermal analysis of a matrix of samples exposed to a variety of conditions showed that significant differences occurred as a function of time, temperature, and acid concentration. Infrared analysis showed unreacted excess alkoxymethyl melamine was hydrolyzed first, followed by the hydrolysis of the crosslinks. Acidic solutions are able to penetrate the coating in a short time. Once in the coating, chemical reactions occur which result in degradation of the crosslinked network causing a change in the thermal properties and the appearance of the coating materials. The reaction is hydrolysis of the crosslinks followed by either destruction or leaching of the crosslinking material. Note de contenu : - EXPERIMENTAL : Panel preparation - Light microscopy - Fluorescent microscopy - Profilometry - Extended period immersion experiments - Differential scanning calorimetry analysis - Infrared spectroscopy
- RESULTS AND DISCUSSION : Spotting exposure experiments - Constant concentration exposure experimentsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17963
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Code-barres Cote Support Localisation Section Disponibilité 003546 - Périodique Bibliothèque principale Documentaires Disponible A study of the effect of acid rain on alkyd, polyester, and silicone-modified high-solids coatings in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 850 (11/1995)
[article]
Titre : A study of the effect of acid rain on alkyd, polyester, and silicone-modified high-solids coatings Type de document : texte imprimé Année de publication : 1995 Article en page(s) : p. 19-28 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Haut extrait sec
Pluies acides
Polyalkydes
Polyesters
Revêtements
Revêtements -- Détérioration
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).Index. décimale : 667.9 Revêtements et enduits Résumé : Acid rain has been recognized as a factor in the degradation of applied coating materials. This study evaluates chemical and physical changes that occured when alkyd, polyester, and silicone modified polyester high-solids coatings were exposed for nearly three years at five precipitation monitored sites in the United States and Canada. In addition, a simulated acid rain chamber that precludes the influence of UV light and a high concentration of sulfur dioxide was used to expose the panels.
The results show degradation to be enhanced as the average pH of rainfall decreases. The evidence also indicates a difference in the chemical changes on the surfaces that are dependent on the formulation and exposure conditions.Note de contenu : - Sample preparation
- Panel preparation
- Site locations
- Simulated acid rain (SAR)
- Weather-ometer (WOM)
- Appearance
- Measurements
- Secondary ion mass spectrometry (SIMS) and ion scattering spectroscopy (ISS)
- Microscopy
- Statistical analysis
- Analysis of fungal organisms on exposed panelsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18571
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Code-barres Cote Support Localisation Section Disponibilité 003496 - Périodique Bibliothèque principale Documentaires Disponible 003508 - Périodique Bibliothèque principale Documentaires Exclu du prêt The impact of acid rain on vegetable tanned leather / Yanping Gao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 3 (05-06/2016)
[article]
Titre : The impact of acid rain on vegetable tanned leather Type de document : texte imprimé Auteurs : Yanping Gao, Auteur ; Yang Shuang, Auteur ; Teng Bo, Auteur ; Jinwei Zhang, Auteur ; Jian Xiaoyun, Auteur ; Lucretia Miu, Auteur ; Carmen Gaidau, Auteur ; Wuyong Chen, Auteur Année de publication : 2016 Article en page(s) : p. 131-135 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Cuirs et peaux -- Analyse
Cuirs et peaux -- Détérioration
Cuirs et peaux -- Propriétés mécaniques
Essais accélérés (technologie)
Essais dynamiques
Morphologie (matériaux)
Pluies acides
Tannage végétalIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Artificial acid rain was chosen to simulate the influences of gaseous pollutants on vegetable-tanned leather. The vegetable-tanned leather samples were soaked in the artificial acid rain for 0, 5, 10, 15, 20 and 25 days, at 50°C and 100% relative humidity conditions. Then, these samples were evaluated by various analytical methods. Micro hot table (MHT), differential scanning calorimetry (DSC) and thermogravimetry (TG) were used to evaluate the influences of acid rain on thermal behaviours. Damage to mechanical properties were also analyzed by a standard method. Fourier transform infrared spectroscopy (FTIR) and optical microscopy were used to investigate the changes of structural and histological properties during ageing. With the extension of ageing time, thermal stability was gradually reduced to lower values, including shrinkage temperature, thermal denaturing temperature, associated enthalpy and temperature of maximum decomposition rate. ln addition, mechanical properties such as tensile strength, tear strength and elongation at break also gradually decreased. The FTIR results showed that, during the ageing process, the amide 1 and amide 11 bands of collagen were gradually shifted to lower numbers, indicating increasingly serious damage to the structure of the peptide chain corresponding to obvious fibril breakages which were also detected through optical microscopy. Note de contenu : - EXPERIMENTAL METHODOLOGY : Materials - Sampling - Preparation of artificial acid rain - Leather ageing process - Analytical methodology
- RESULTS AND DISCUSSION : Thermal analysis - Mechanical properties - Morphology and structureEn ligne : https://drive.google.com/file/d/1qSZYzF-OT_TZl-1LmxTyAgXz_8UA3qET/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26446
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 3 (05-06/2016) . - p. 131-135[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18140 - Périodique Bibliothèque principale Documentaires Disponible