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JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) / Union internationale des sociétés de techniciens et chimistes des industries du cuir . Vol. 94, N° 6Mention de date : 11-12/2010Paru le : 15/12/2010 |
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Ajouter le résultat dans votre panierModelling the solubility of films prepared from collagen hydrolysate / Pavel Mokrejs in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 6 (11-12/2010)
[article]
Titre : Modelling the solubility of films prepared from collagen hydrolysate Type de document : texte imprimé Auteurs : Pavel Mokrejs, Auteur ; Dagmar Janacova, Auteur ; Petr Svoboda, Auteur ; Vladimir Vasek, Auteur Année de publication : 2010 Article en page(s) : p. 231-239 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Amidon dialdéhyde
Analyse thermique
Biodégradation
Collagène
Couches minces
GlycérineLe glycérol, ou glycérine, est un composé chimique de formule HOH2C–CHOH–CH2OH. C'est un liquide incolore, visqueux et inodore au goût sucré, utilisé dans de nombreuses compositions pharmaceutiques. Sa molécule possède trois hydroxyles correspondant à trois fonctions alcool responsables de sa solubilité dans l'eau et de sa nature hygroscopique. Un résidu glycérol constitue l'articulation centrale de tous les lipides de la classe des triglycérides et des phosphoglycérides.
PROPRIETES PHYSIQUES : Le glycérol se présente sous la forme d'un liquide transparent, visqueux, incolore, inodore, faiblement toxique si ingéré (mais laxatif à haute dose), au goût sucré.
Le glycérol peut se dissoudre dans les solvants polaires grâce à ses trois groupes hydroxyles. Il est miscible dans l'eau et l'éthanol ; et insoluble dans le benzène, le chloroforme et le tétrachlorométhane.
Son affinité avec l'eau le rend également hygroscopique, et du glycérol mal conservé (hors dessicateur ou mal fermé) se dilue en absorbant l'humidité de l'air.
- PROPRIETES CHIMIQUES : Dans les organismes vivants, le glycérol est un composant important des glycérides (graisses et huiles) et des phospholipides. Quand le corps utilise les graisses stockées comme source d'énergie, du glycérol et des acides gras sont libérés dans le sang.
- DESHYDRATATION : La déshydratation du glycérol est faite à chaud, en présence d'hydrogénosulfite de potassium (KHSO3) et produit de l'acroléine
- ESTERIFICATION : L'estérification du glycérol conduit à des (mono, di ou tri) glycérides.
- AUTRES PROPRIETES : Le glycérol a un goût sucré de puissance moitié moindre que le saccharose, son pouvoir sucrant est de 0,56-0,64 à poids égal13.
Le glycérol a des propriétés laxatives et diurétiques faibles.
Comme d'autres composés chimiques, tels que le benzène, son indice de réfraction (1,47) est proche de celui du verre commun (~1,50), permettant de rendre "invisibles" des objets en verre qui y seraient plongés.
Hydrolysats de protéines
Plastifiants
Solubilité
ThermogravimétrieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The work deals with modeling the solubility of biodegradable films prepared from collagen hydrolysate. To this purpose, we studied the effect of added plasticizer, cross-linking agent or additional thermal annealing on the dissolution rate of films ; experiments were planned as factorial tests of the 2-3 type. The basis for preparing films was a 15 % (w/v) solution of hydrolysate with various additions of plasticizer - glycerol (GLY) in quantities of 0,5 and 10 % (related to hydrolysate dry matter, w/w), cross-linking agent - dialdehyde starch (DAS) in quantities of 0,4 and 8 % (related to hydrolysate dry matter, w/w).
Films were prepared by casting solution on silicone plates with subsequent evaporation of solvent (water) in 72 hours at 35°C. A part of the films was subjected to addition thermal annealing at 62,5 and 90°C. Solubility tests on films were performed in water at 25°C. The percentage of dissolved film was determined through gravimetry.
The results of film solubility were assessed statistically and graphic models were produced. It was found that added dialdehyde starch and additional thermal annealing very prominently affect the course of film dissolution. Qualities further studied with prepared films were thermal properties by DSC and TGA techniques.En ligne : https://drive.google.com/file/d/120G7dUuljbC50drzKR-GMmvij-bqkKhh/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10808
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Code-barres Cote Support Localisation Section Disponibilité 012670 - Périodique Bibliothèque principale Documentaires Disponible Preparation of cationic fluorinated polyurethane micro-emulsion and its application in leather finishing / Li Peizhi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 6 (11-12/2010)
[article]
Titre : Preparation of cationic fluorinated polyurethane micro-emulsion and its application in leather finishing Type de document : texte imprimé Auteurs : Li Peizhi, Auteur ; Shen Yiding, Auteur ; Yang Xiaowu, Auteur ; Li Ganghui, Auteur Année de publication : 2010 Article en page(s) : p. 240-247 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcools
Analyse thermique
Angle de contact
Cuirs et peaux -- Finition
Diisocyanate d'isophorone
Fluoropolymères
Fourier, Spectroscopie infrarouge à transformée de
Microémulsions
Microscopie électronique en transmission
Perfluorooctyles
Polyéthers
Polymères cationiques
Polyuréthanes
Propane de triméthylol
Tension superficielle
ThermogravimétrieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A waterborne cationic fluorinated polyurethane (WCFPU) was prepared by the reaction of isophorone isocyanate (IPDI), polyether polyol (PTMG1000), N-methyldiethanolamine (MDEA), trimethylol propane (TMP) and 2-(perfluorooctyl) ethyl alcohol (FEOH), and then was used in leather finishing. Their structure, morphology, surface property, thermal performance and chemical resistance were characterized by Fourier trnasform infrared spectromoter (FT-IR), light scattering (LS), transmission electron microscope (TEM), interfacial tension instrument (IT), contact angle (CA), differential scanning calorimeter (DSC), thermogravimetry (TG) and spot test. The results reveal that WCFPU was endowed with low surface tension of its micro-emulsion and low surface energy of its film which was beneficial to the properties of coating. DSC and TG diagrams also revealed that the application range of product was enlarged. It was also found that the fluorinated polyurethane had outstanding chemical resistance. Furthermore, it was found that the WCFPU micro-emulsion was a good finishing agent, endowing leather with water and oil resistance, natural brightness, softness, embonpoint and moist surface, and thus evidently improved the quality of leather. En ligne : https://drive.google.com/file/d/1IZfa9XaCrfcntckzzBF9mqqQhJSV55br/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10809
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Code-barres Cote Support Localisation Section Disponibilité 012670 - Périodique Bibliothèque principale Documentaires Disponible Study of cross-linking reactions on butadiene binders in aqueous finishing / Anna Bacardit in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 6 (11-12/2010)
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Titre : Study of cross-linking reactions on butadiene binders in aqueous finishing Type de document : texte imprimé Auteurs : Anna Bacardit, Auteur ; A. Shendrik, Auteur ; Felipe Combalia, Auteur ; J. Jorge, Auteur ; Lluis Ollé, Auteur Année de publication : 2010 Article en page(s) : p. 248-252 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymérisation
Cuirs et peaux -- Finition
Formulation (Génie chimique)
Liants
Polyacryliques
Polybutadiène
Polycarbodiimide
Polyéthylèneimine
Polyisocyanates
Polymères réticulés
Polyuréthanes
Réticulation (polymérisation)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Study of cross-linking reactions on butadiene binders in aqueous finishing --- BUtadienes, like acrylic binders and polyurethanes, can be cross-linked to improve their wet fastness properties. Nowadays, four type of cross-linkers for leather finishing are available : polyaziridines, polyizocyanates, polycarbodiimides and epoxy compounds. The aim of this study is to compare the mechanism of reaction of these four types of cross-linkers and the possibility of using a polysilane as a cross-linking agent for butadienes. A comparison of results shows that all cross-linkers studied improve wet rub fastness. However, polyaziridine and polysilane emerge as the most effective cross-linkers for butadiene binders. En ligne : https://drive.google.com/file/d/1zp4Ifj1BohhvD7TBzTkB7LXvW1jCiEeU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10810
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 94, N° 6 (11-12/2010) . - p. 248-252[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012670 - Périodique Bibliothèque principale Documentaires Disponible Assessment of water management in tanneries / Patrice Monteiro de Aquim in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 6 (11-12/2010)
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Titre : Assessment of water management in tanneries Type de document : texte imprimé Auteurs : Patrice Monteiro de Aquim, Auteur ; Mariliz Gutterres, Auteur ; Jorge Trierweiler, Auteur Année de publication : 2010 Article en page(s) : p. 253-258 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eaux usées -- Analyse
Gestion des ressources en eau
Tannage
Tannage -- Aspect de l'environnementIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Assessment of water management in tanneries --- This study evaluates the use of water in processing hides into leather. It investigates the environmental impact on water resources of tanneries in Rio Grande do Sul State, evaluating the water demand and concentrations of certain chemicals in the wastewater discharged from the beamhouse, tanning and retanning processes of this industry.
A questionnaire was formulated which was intended to identify water management problems in tanneries, and the possible alternatives available to tanneries aiming at their improvement. A simple and objective application called IRGO (insufficient, regular, good and optimal was developed. The IRGO was applied to 10 tanneries. After completing the questionnaire, the tanneries could check how removed they are from an ideal tannery and ascertain which actions must be taken to improve their performance.
The results showed that there is a large demand for water in the process and little water is re-used. The most conventional liming process employs sulphide, lime and amine and recycling is already applied to this operation in the state. The steps of washing, deliming and the float itself use large quantities of water, although the majority of the tanneries do not use ammonia in deliming. The tanning procedure most used employs chrome III without recycling. In relation to retanning, studies need to be carried out aiming to increase the efficiency of the absorption of chemicals. The wastewater treatment plants are satisfactory due to the requirements of the environmental organizations.En ligne : https://drive.google.com/file/d/1FfVgVeI6OIap-Jj61pjuYIU02rdssLx3/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10811
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Code-barres Cote Support Localisation Section Disponibilité 012670 - Périodique Bibliothèque principale Documentaires Disponible Examination of bacterial and archael populations in salt, salted and soaked hide and soak liquors via fluorescent in situ hybridization / Didem Berber in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 6 (11-12/2010)
[article]
Titre : Examination of bacterial and archael populations in salt, salted and soaked hide and soak liquors via fluorescent in situ hybridization Type de document : texte imprimé Auteurs : Didem Berber, Auteur ; Meral Birbir, Auteur ; Bulent Mertoglu, Auteur Année de publication : 2010 Article en page(s) : p. 259-261 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bactéries -- Comptage
Bain de trempe
Hybridation fluorescente in situ
MicrobiologieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Examination of bacterial and archael populations in salt, salted and soaked hide and soak liquors via fluorescent in situ hybridization --- A high bacterial population belonging to the domains of bacteria and archaea originating from inadequate salt curing and soaking processes may cause an important quality reduction in leather. A simple and rapid molecular technique such as fluorescent in situ hybridization technique (FISH) which may be applied in leather making processes may assist to solve this problem. Therefore, in the present study the FISH technique was used to track bacterial and archaeal domains in salt (n=15), salted (n=15), soaked hides (n=15) and soak liquor (n=15) samples. Although archaeal population was dominant in the salt samples, a bacterial population was dominant in the soaked hide and soak liquor samples. The salted hide samples contained both archaeal and bacterial populations. The FISH method applied to the samples showed that high extremely halophilic archaeal population on the salted hides and high bacterial population in soak liquor and soaked hides originated from the salt and the salted hides, respectively. As a conclusion, the FISH technique was found suitable for the rapid assessment and tracking microbial domains in salt, salted and soaked hide and soak liquor samples. En ligne : https://drive.google.com/file/d/106pQ0jqFpEKV7zkhOIp7ztWJSwu7jLr2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10812
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Code-barres Cote Support Localisation Section Disponibilité 012670 - Périodique Bibliothèque principale Documentaires Disponible Reverse reference flow injection spectrophotometry for the determination of chromium(VI) extracted from leather by artificial perspiration / Li Wang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 6 (11-12/2010)
[article]
Titre : Reverse reference flow injection spectrophotometry for the determination of chromium(VI) extracted from leather by artificial perspiration Type de document : texte imprimé Auteurs : Li Wang, Auteur ; Zhang Xinshen, Auteur ; Li Hui, Auteur ; Dai Shijun, Auteur ; Sun Dongmei, Auteur ; Sun Jing, Auteur ; Yang Yujie, Auteur ; Tong Ling, Auteur Année de publication : 2010 Article en page(s) : p. 262-267 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir -- Teneur en chrome hexavalent
Cuirs et peaux -- Analyse
Extraction (chimie)
Spectrophotométrie
TranspirationIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Reverse reference flow injection spectrophotometry for the determination of chromium(VI) extracted from leather by artificial perspiration --- Reverse reference flow injection analysis (r-FIA) is proposed to determine chromium(VI) extracted from finished leather by artificial perspiration. The extraction of chromium(VI in leather and the decolouration of leather extract were investigated.Under the optimal conditions, the linear range of this method was 1-50%g/l ; the detection limit was 0.62%g/l ; the relative standard deviation (n=10) for 10µg/l chromium(VI) was 1,74 %. For leather samples, the corresponding linear range of this method was 0,5-25mg/kg. This method is suitable for automatic and continuous analysis and gives satisfactory results when applied to the determination of chromium(VI) extracted from finished leather by artificial perspiration. En ligne : https://drive.google.com/file/d/1QMTaeWleX8DyQc9tDGKQdgIU123LW46u/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10813
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Code-barres | Cote | Support | Localisation | Section | Disponibilité |
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012670 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |