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Characterization of immiscibly blended polyurethane coatings part 1 : selective staining for enhanced micro-Raman spectroscopy / Nicholas W. M. Heller in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 1 (01/2017)
[article]
Titre : Characterization of immiscibly blended polyurethane coatings part 1 : selective staining for enhanced micro-Raman spectroscopy Type de document : texte imprimé Auteurs : Nicholas W. M. Heller, Auteur ; Clive R. Clayton, Auteur ; Spencer L. Giles, Auteur ; James H. Wynne, Auteur ; Mark E. Walker, Auteur ; Mark J. Wytiaz, Auteur Année de publication : 2017 Article en page(s) : p. 163-175 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agent mattant
Epoxydes
Matériaux -- Coloration
Pigments
Polyacryliques
Polyols
Polyuréthanes
Réticulation (polymérisation)
Revêtements poudre:Peinture poudre
Spectroscopie Raman
Styrène
ThermodurcissablesIndex. décimale : 667.9 Revêtements et enduits Résumé : Raman spectroscopy (RS) mapping of the selective infiltration of styrene monomer has been developed as a protocol for polymeric phase identification in resin-blended thermoset powder coatings. Blends of incompatible acrylic polyols, with low and high hydroxyl contents, combined with matting agents and pigments, were crosslinked to produce unique low gloss thermosets. The low reflectance originated from a synergistic effect between the polymeric phase separation and the incorporation of the matting agents and pigments. RS conclusively identified the phases within the blended film using polyester-embedded cross-section samples. Further analysis has revealed that monomeric styrene from the polyester-embedding resin produced the spectroscopic handle necessary for domain identification. Preferential infiltration of styrene was therefore investigated through dip and vapor staining of the blended and individual resin films. The spectroscopic handle had manifested through the consistent infiltration of styrene within the low hydroxyl film. The contamination in the cross-sections was eliminated when an epoxy-embedding resin was utilized, which produced no such marker peak in the ensuing spectra. These observations led to the development of the described selective staining protocol for micro-Raman analysis, which enabled very reproducible results for enhanced chemical mapping of phase-separated coatings. Note de contenu : - EXPERIMENTAL : Coating preparation - Optical microscopy - Differential scanning calorimetry (DSC) - Raman spectroscopy - Cross-section sample preparation - Styrene vapor staining
- RESULTS AND DISCUSSION : DSC analysis and optical microscopy of the blend surface - Raman spectroscopy of coating surfaces and embedded cross-sections - Domain identification by Raman mapping - Controlled staining with styrene vaporDOI : 10.1007/s11998-016-9839-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9839-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27798
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Code-barres Cote Support Localisation Section Disponibilité 18674 - Périodique Bibliothèque principale Documentaires Disponible Fluorescence polarization of dye-labeled collagen : local flexibility in the nonhelical region / D. Quimby in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)
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Titre : Fluorescence polarization of dye-labeled collagen : local flexibility in the nonhelical region Type de document : texte imprimé Auteurs : D. Quimby, Auteur ; Lee P. Witnauer, Auteur Année de publication : 1975 Article en page(s) : p. 510-518 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène -- Analyse
Colorants
Fluorescence
Matériaux -- Coloration
Mesure
Polarisation (lumière)
PronaseIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The fluorescent dye derivatives fluorescein isothiocyanate (FI) and 5-dimethylamino-1-naphthalene sulfonyl chloride (DNS) have been covalently bound to collagen. Fluorescence from the FI conjugate is depolarized primarily hy rotation of the dye molecule about the covalent bond joining it to the protein. DNS on the other hand binds tightly to the helical regions of collagen and fluorescence from the DNS conjugate is depolarized hy rotatory diffusional motion in the nonhelical regions of the protein. Variation in pH between 3 and 10.5 has little effect on the degree of fluorescence polarization of the DNS conjugate, indicating that the degree of flexibility in the nonhelical regions remains unchanged in this pH range. Ca2+ ion induces local flexibility in the helical regions of collagen, and removal of the nonhelical regions by pronase treatment seems to render the helical regions more susceptible to perturbation by Ca2+ ions. Note de contenu : - Materials
- Dye coupling
- Pronase treatement
- Equipment and measurementsEn ligne : https://drive.google.com/file/d/1cQMpUdRnNhm7Rah6-R0GtJ1Ly4TohNlV/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38794
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Code-barres Cote Support Localisation Section Disponibilité 008509 - Périodique Archives Documentaires Exclu du prêt Heterologous expression of alkaline metalloproteinases in bacillus subtilis sck6 for eco-friendly enzymatic unhairing of goatskins / Shihao Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 3 (03/2022)
[article]
Titre : Heterologous expression of alkaline metalloproteinases in bacillus subtilis sck6 for eco-friendly enzymatic unhairing of goatskins Type de document : texte imprimé Auteurs : Shihao Zhang, Auteur ; Ruoshi Zhang, Auteur ; Xiaoguang Li, Auteur ; Zhe Xu, Auteur ; Yongqiang Tian, Auteur Année de publication : 2022 Article en page(s) : p. 113-123 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux de chèvres
Epilage enzymatique
Matériaux -- Coloration
Métalloprotéinases
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this study, alkaline metalloprotease gene 1067 was cloned from Planococcus halotolerans SCU63T and heterologously expressed in Bacillus subtilis SCK6. Using Luria Bertani (LB) broth medium as the initial medium, the optimal medium was obtained through a series of fermentation and culture optimization (g/L): yeast extract (10), soybean powder (15), urea (20), potassium chloride (6.7), calcium chloride (13.3), NaCl (10). On the basis of the optimal medium, the highest enzymatic activity of 1259.21 U/mL could be obtained by culturing at 30°C for 40 h. with pH 8, inoculation amount of 4% and filling amount of 50 mL. EDTA inhibits protease activity and PMSF promotes it, indicating that it was a metalloprotease rather than a serine protease. The optimum reaction temperature of the protease is 70°C, and the optimum pH is 9. The metal ions Zn 2+, Co2+ and surfactant β-ME, Tween 80 can improve the activity of the protease. The results of unhairing, SEM and staining show that this metalloprotease can completely dehair goatskin. Compared with the conventional chemical method, the goatskin after enzymatic unhairing has softer texture and smoother surface, and there is no obvious damage to the goatskin. Note de contenu : - MATERIALS AND METHODS : Materials - Construction of recombinant plasmid and expression of 1067 in B. subtilis SCK6 - Optimization of fermentations conditions - Purification of protease 1067 - Enzyme assay - Analysis of enzymatic properties - Unhairing function of protease 1067 - Characterization of protease 1067 unhairing
- RESULTS AND DISCUSSION : Construction of recombinant strain and identification of protease activity - Fermentation optimization - Purification and identification of protease 1067 - Effect of temperature on enzyme activity and stability - Effect of pH on enzyme activity and stability - Effect of metal ions on enzyme activity - Effects of chemicals on enzyme activity - Effect of organic solvents on enzyme activity - Analysis of unhairing - SEM and analysis of tissue staining
- Table 1 : Factors and levels for RSM
- Table 2 : ANOVA for quadratic model
- Table 3 : Effect of metal ions on enzyme activity
- Table 4 : Effect of chemicals on enzyme activity
- Table 5 : Effect of solvents on enzyme activity
- table 6 : Characterization of mechanical properties of wet blue skinDOI : https://doi.org/10.34314/jalca.v117i3.4892 En ligne : https://drive.google.com/file/d/1z4VjDZxnKDTJf0c5BtRxJKAwUieQ2jK9/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37602
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Code-barres Cote Support Localisation Section Disponibilité 23402 - Périodique Bibliothèque principale Documentaires Disponible In-plant tinting means competitive advantage / Daniela Damoiseaux in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 204, N° 4602 (11/2014)
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Titre : In-plant tinting means competitive advantage Type de document : texte imprimé Auteurs : Daniela Damoiseaux, Auteur Année de publication : 2014 Article en page(s) : p. 20-21 Langues : Anglais (eng) Catégories : Matériaux -- Coloration
Teinture -- Appareils et matérielsIndex. décimale : 667.9 Revêtements et enduits Résumé : An increasing number of European paint producers benefit from using in-plant tinting solutions. These systems deliver accurate and high-quality tinting results. They are an economic solution especially for short-notice, smaller batch requirements. Growing pressure from competitors and rising customer demands led the German paint producer Remmers Baustofftechnik GmbH and Théolaur Peintures in France to switch from captive production to in-plant tinting solutions. Combined with the colourants from Chromaflo Technologies, they have been the key enabler for competitive advantage. Note de contenu : - Quicker reaction times to market demands
- Value for money
- Minimised production costs and higher market shareEn ligne : https://drive.google.com/file/d/1Ctd6z0reaqBcWB8PjHDmS0C5McTzmKYV/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22374
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Code-barres Cote Support Localisation Section Disponibilité 16675 - Périodique Bibliothèque principale Documentaires Disponible Is magnesium oxide causing staining ? / Karl Flowers in LEATHER INTERNATIONAL, Vol. 217, N° 4864 (09/2016)
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Titre : Is magnesium oxide causing staining ? Type de document : texte imprimé Auteurs : Karl Flowers, Auteur Année de publication : 2016 Article en page(s) : p. 47-50 Langues : Anglais (eng) Catégories : Bases (chimie)
Cuirs et peaux
Matériaux -- Coloration
Oxyde de magnésiumL'oxyde de magnésium, communément appelé magnésie, a pour formule MgO et se présente sous la forme de poudre blanche très fortement basique absorbant l'eau et le dioxyde de carbone présents dans l'atmosphère.
STRUCTURE : L'oxyde de magnésium est un cristal ionique. L'oxyde de magnésium a une structure comparable à celle du chlorure de sodium7. Cela se traduit par
Un réseau d'anion oxygène formant une structure de type cubique à faces centrées
Un réseau de cation magnésium occupant l'ensemble des sites octaèdriques.
L'oxyde de magnésium est un matériau modèle des cristaux ioniques car la faible électronégativité du magnésium, et la forte électronégativité de l’oxygène font que la structure de l’oxyde de magnésium peut s’expliquer quasi uniquement grâce à des interactions entre des particules ponctuelles chargées 10.
La surface de l'oxyde de magnésium la plus stable dans le vide est obtenue en réalisant une coupe selon le plan cristallographique (100). Les particules d'oxyde de magnésium produites par combustion du magnésium métallique présentent d'ailleurs une forme cubique révélatrice de la présence de ces plans. Néanmoins, en présence d'eau, la surface de l'oxyde de magnésium est couverte d'ions hydroxyles qui stabilisent les plans (111)
PRODUCTION : La majeure partie de l'oxyde de magnésium est actuellement obtenue soit à partir de carbonate de magnésium MgCO3 qui constitue certains minéraux tels que la magnésite, soit à partir de chlorure de magnésium que l'on extrait de l'eau de mer ou de saumures souterraines.Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : An increasing number from tanners complain about the staining they are seeing after basification of chromium-tanned leathers. In this article, we ask whether the processing practice is leading to this or if it's a characteristic of the chemicals that are currently used.
During the basification operation, a weak alkali is added into the acidic tanning bath to raise the pH and increase the reactivity of the chemicals in the bath for the untanned pelt. With a few possible exceptions, most chromium-tanning processes use either magnesium oxide (Mg0) or sodium bicarbonate (NaHCO3). For the past 15 years, it has been common practice to use low-solubility Mg0 because of the control tanneries have over the increase in the tanning-bath pH.Note de contenu : - TABLE : The manufacturing parameters and MgO characteristics
- FIGURES : 1. Three pH-versus-time profiles depending on the nature and manner in which alkalis are added to tanning baths - 2. A schematic normal particle size distribution for two different MgO powderEn ligne : https://drive.google.com/file/d/1T24_yb5np0vb6rVXdkauTCZ_enh94Fw1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26842
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Code-barres Cote Support Localisation Section Disponibilité 18255 - Périodique Bibliothèque principale Documentaires Disponible Mechanism and properties of coloured nanoscale SiO2 prepared from silica and reactive dyes / Liping Zhang in COLORATION TECHNOLOGY, Vol. 132, N° 5 (10/2016)
PermalinkMixing and matching / Simo Laitala in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4453 (06/2002)
PermalinkA modified method for fixation and staining of the elastic fibre in goatskin at the ultrastructural level / Ding Haiyan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 1 (01-02/2004)
PermalinkPotential for carrying dyes derived from spalting fungi in natural oils / Sara C. Robinson in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)
PermalinkReduced angle sensitivity of structural coloration on an industrial aluminium platform / Rachel Odessey in COLORATION TECHNOLOGY, Vol. 136, N° 3 (06/2020)
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PermalinkThe microstructure of raw hides of crocodylus niloticus / Qiang Taotao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 4 (07-08/2018)
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