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Bake oven induced variation of surface chemistry on electrocoat paint / Larry P. Haack in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 903 (04/2000)
[article]
Titre : Bake oven induced variation of surface chemistry on electrocoat paint : Effect on primer-electrocoat intercoat adhesion Type de document : texte imprimé Auteurs : Larry P. Haack, Auteur ; Joseph W. Holubka, Auteur Année de publication : 2000 Article en page(s) : p. 63-70 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau revêtement Peinture Multicouche Durcissement Cuisson au four Propriété surface Adhérence Interface Dépôt électrophorèse Etude expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : The interplay of bake oven processing environment and surface/interfacial chemistry, and their effect on intercoat adhesion has been investigated for a model primer/electrocoat paint system. X-ray photoelectron spectroscopy (XPS) surface analysis established that a prominent ether component in the C is core level spectrum correlated with a polyether-based crater-control additive in the electrocoat that surface-segregates during cure. Laboratory-simulated bake oven experiments confirmed that better adhesion characteristics were realized by removal of this electrocoat overlayer through reaction with nitrogen oxides and high levels of moisture present in the cure environment of production direct-fired ovens. Details of the effect of bake oven atmosphere on cure chemistry for direct-fired versus indirect-fired ovens are presented. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5817
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 903 (04/2000) . - p. 63-70[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001208 - Périodique Bibliothèque principale Documentaires Disponible Enzymatic hydrolysis of skin shavings for preparation of collagen hydrolysates with specified molecular weight distribution / Chi Yuanlong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 1 (01-02/2012)
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Titre : Enzymatic hydrolysis of skin shavings for preparation of collagen hydrolysates with specified molecular weight distribution Type de document : texte imprimé Auteurs : Chi Yuanlong, Auteur ; Cui Min, Auteur ; Cui Xiaoju, Auteur ; Wenhua Zhang, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2012 Article en page(s) : p. 16-20 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène
Cuirs et peaux -- Déchets
Hydrolysats de protéines
Hydrolyse enzymatiqueTags : 'Copeaux tannerie' 'Protéase 1398' 2709' Alcalase Papaïne Pepsine 537' Trypsine 'Titration formaldehyde' Electrophorèse 'Ges dodécyl sulfate-polyacrylamide sodium' 'Ultrafiltration centrifuge' Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Collagen hydrolysates were extracted from tannery skin shavings through enzymatic hydrolysis by using protease 1398, protease 2709, alcalase, papain, pepsin, protease 537 and trypsin, respectively. The hydrolytic degree and molecular weight distribution (MWD) of the hydrolysages were evaluated by the formaldehyde titration method, sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE), tricine-SDS-PAGE and centrifugal ultrafiltration. It was found that the MWD of the as prepared collagen hydrolysates has a close correlation with the hydrolytic degree, and greatly depends on the enzyme employed. The low molecular weight (MW) collagen hydrolysates, with relatively high hydrolytic degree, were obtained by enzymatic hydrolysis using protease 1398, protease 2709, papain and alcalase. More than 60% (mass ratio) of the fractions in these four hydrolysates were in the molecular weight range of <10kDa. The use of protease 537 produced medium-MW collagen hydrolysages where 40% of the fractionswere of 10-30kDa. The high-MW collagen hydrolysages that include about 66% fractions with molecular weights higher than 20kDa were obtained by using pepsin, accompanied by the lowest hydrolytic degree. This research provides a potential approache for molecular weight and molecular weight distribution control collagen hydrolysates by enzymatic hydrolysis ot tannery skin wastes. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - Determination of hydrolytic degree of collagen - SDS-PAGE and tricine-SDS-PAGE determination - Centrifugal ultrafiltration analysis
- RESULTS AND DISCUSSION : Hydrolytic degree analysis
- SDS-PAGE and tricine-SDS-PAGE patterns - Centrifugal ultrafiltration analysis on MWDEn ligne : https://drive.google.com/file/d/1NEe4OCKiTxbrMEX3emn2sQFAzagsFJQc/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13549
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 96, N° 1 (01-02/2012) . - p. 16-20[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13659 - Périodique Bibliothèque principale Documentaires Disponible