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An air permeability model for leathers / Keyong Tang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 3 (05-06/2006)
[article]
Titre : An air permeability model for leathers Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Fang Wang, Auteur ; Jie Liu, Auteur ; Jinglong Liu, Auteur ; Wang Quanjie, Auteur Année de publication : 2006 Article en page(s) : p. 108-111 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Air
Cuir
Cuirs et peaux -- Analyse
Modèles techniques
PerméabilitéIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : We have constructed a model of air permeability taking into account appropriate parameters. Two of the parameters which represent the capillary radius and the amount of capillaries in a definite area of leather, respectively r and n have been deduced.
Researches on the locational differences in air permeability based on the model, show that different locations of leather have different values for r and n. The capillary radius of samples near the head location ranges from 452.9nm to 479.1nm, while the quantity of capillaries in the same sample is the greatest, from 7.948 x 1011/m2 to 8.617 x 1011/m2. The capillary radius (r) of a sample from a near centre location is the largest at 581.0nm and the capillary amount (n) is the lowest at only 5.262 x 1011/m2. The capillary radii of samples near the tail and centre of the leather are about 530nm.
Neither the thickness nor aperture ratio can successfully represent the air permeability of leathers. The air permeability process is rather complex. Using only the capillary radius (r) or the quantity of capillaries in a definite area (n) does not allow us to express the air permeability adequately.Note de contenu : - Foundation of the air permeability model and the deduction of parameters
- Experimental procedure - Materials and apparatus - Procedures
- Table 1 : Original data and parameters r and nEn ligne : https://drive.google.com/file/d/1HjUKWAETMsGqiIcbYipmlDvDSEoWHkjd/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39142
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 90, N° 3 (05-06/2006) . - p. 108-111[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Characterization and thermal properties of polygenipin-crosslinked hide powders / Jie Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 4 (04/2018)
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Titre : Characterization and thermal properties of polygenipin-crosslinked hide powders Type de document : texte imprimé Auteurs : Jie Liu, Auteur ; Eleanor M. Brown, Auteur ; Cheng-Kung Liu, Auteur ; Keyong Tang, Auteur Année de publication : 2018 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique
Caractérisation
Couleur
Génipine
Poudre de peaux
Réticulation (polymérisation)
Stabilité thermique
ThermogravimétrieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Genipin is a naturally occurring iridoid compound, it is widely used as an ideal biological protein crosslinking agent due to its low toxicity compared to glutaraldehyde and formaldehyde. Under alkaline condition, genipin could undergo ring-opening polymerization via nucleophilic attack of hydroxyl ions followed by an aldol condensation. Because of the fact that polygenipin could create long-range intermolecular crosslinking between protein chains, preliminary investigations have been carried out to study effect of polygenipin crosslinking on color and thermal stability of hide powder by using colorimetry, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results show that the peak denaturation temperature (Tp) for hide powders obtained from DSC increased to a maximum and then decreased with increasing of the molecular weight of polygenipin. Degree of crosslinking was evaluated, and the results suggest that thermal stability of hide powder is influenced not only by degree of crosslinking, but also by the type of crosslinking. Thermogravimetric analysis also confirms that long-range intermolecular crosslink bridges formed between collagen molecules results in more thermally stable hide powders. This study suggests that polygenipin can be potentially useful in producing eco-friendly leather. Note de contenu : - EXPERIMENTAL : Materials - Preparation of polygenipin - Preparation of the polygenipin crosslinked hide powders - Colors parameters - Degree of crosslinking (DC) - Differential scanning calorimetry (DSC) - Thermogravimetric analysis (TGA)
- RESULTS AND DISCUSSION : Characterization of polygenipin - Color parameters of polygenipin crosslinked hide powders - Degree of crosslinking - Differential scanning calorimetry - Thermogravimetric analysisEn ligne : https://drive.google.com/file/d/1Llp-sHkQH85153d8dB0r7CFGqTdROUTK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30338
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Code-barres Cote Support Localisation Section Disponibilité 19772 - Périodique Bibliothèque principale Documentaires Disponible Collagen fiber opening of cattle hides in urea/calcium hydroxide solutions / Qian Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 5 (05/2021)
[article]
Titre : Collagen fiber opening of cattle hides in urea/calcium hydroxide solutions Type de document : texte imprimé Auteurs : Qian Zhang, Auteur ; Jie Liu, Auteur ; Xiumin Li, Auteur ; Hui Liu, Auteur ; Yadi Hu, Auteur ; Keyong Tang, Auteur Année de publication : 2021 Article en page(s) : p. 147-154 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chaulage
Chaux
Cuirs et peaux de bovins
Eaux usées -- Analyse
Fibrilles de collagèneLa fibrille de collagène est une structure constituée d'un assemblage de fibres de tropocollagène (assemblage de 3 protéines de collagène alpha (alpha 1 - alpha 1 - alpha 2) en une hélice droite.
Gonflement (physique)
Hydroxyproline
pH
ProtéoglycanesUn protéoglycane est une glycoprotéine, combinaison d'une protéine et d'un glycosaminoglycane (GAG). L'association entre les deux types de chaîne s'effectue essentiellement dans l'appareil de Golgi, mais également au niveau du réticulum endoplasmique d'une cellule. La proportion de glucides des protéoglycanes peut atteindre 95 %. Ceux-ci se présentant sous la forme d'une ou plusieurs chaînes de glycosaminoglycanes non ramifiées. Les chaînes de sucres sont très longues mais pas ramifiées. Ils sont O-glycosylés, se lient à l'acide aminé sérine à l'extrémité OH. Les protéoglycanes peuvent être soit transportés à l'extérieur de la cellule par exocytose (s'intégrant alors à la matrice extracellulaire sous forme de chondroïtine-sulfate, kératan-sulfate, héparan-sulfate, dermatan-sulfate, etc.), soit entrer dans la constitution de la membrane plasmique ou du glycocalyx, jouant alors un rôle dans les relations cellule-matrice.
Les PG (protéoglycanes) ont des compositions et poids moléculaire très variés et sont hétérogènes au niveau de leur structure et de leur fonction.
Les protéoglycanes sont des composants essentiels de la matrice extracellulaire. Ce sont des pièges à eau qui sont importants pour les propriétés mécaniques des tissus cartilagineux par exemple. Les héparan sulfates peuvent avoir un rôle dans la signalisation : ce sont des co-récepteurs pour les FGF (Fibroblast Growth Factor). Les protéoglycanes jouent aussi un rôle dans la diffusion des molécules de signalisation (Wnt, Shh), ou bien en interagissant avec des inhibiteurs (Noggin). (Wikipedia)
Travail de rivière (cuir)
UréeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the beamhouse, liming might directly affect the structure and performance of collagen, as well as the quality of resultant leather. However, the influences of composition and content of liming agents on liming mechanism are quite complicated. In this study, calcium hydroxide and urea were utilized in liming. The solution pH, hide swelling ratio and non-collagenous protein removal were quantitatively analyzed. The morphologies of both limed and fresh hides were studied by optical microscopy. The reaction mechanism of fiber opening up of cattle hides was analyzed and speculated by the combination of thermogravimetric analysis and Fourier transformation infrared spectroscopy. It was found that the fiber bundles of hides limed by urea/calcium hydroxide have a better opening up effect than that by pure calcium hydroxide. The mechanism of liming in an urea/calcium hydroxide solution system was proposed. Note de contenu : - EXPERIMENTAL : Materials - Liming treatment - pH of the liming solutions - Swelling ratios of cattle hides - Protein content in wastewater - Proteoglycan content in wastewater - Hydroxyproline content in wastewater - Structure
- RESULTS AND DISCUSSION : The pH of liming solutions - Swelling ratio of hides after liming - Contents of total protein proteoglycan and hydroxyproline in wastewater - Histological photographs and scanning electron microscopy - TG results - Possible liming mechanism
- Table 1 : Quantitative evaluation of beamhouse processes
- Table 2 : The onset temperature and weight loss ratio of hides limed with different liming systemsDOI : https://doi.org/10.34314/jalca.v116i5.4290 En ligne : https://drive.google.com/file/d/1aZQ5PRfXiX6tp0ZZbmBHHYtHdlg7Bg6O/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35757
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Code-barres Cote Support Localisation Section Disponibilité 22726 - Périodique Bibliothèque principale Documentaires Disponible Development of gold nanorods-based colorimetric method for the determination of formaldehyde in leather / Qingxiu Liu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 5 (09-10/2020)
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Titre : Development of gold nanorods-based colorimetric method for the determination of formaldehyde in leather Type de document : texte imprimé Auteurs : Qingxiu Liu, Auteur ; Xiaotian Ziu, Auteur ; Jie Liu, Auteur ; Qin Shufa, Auteur ; Xuejing Zheng, Auteur ; Keyong Tang, Auteur Année de publication : 2020 Article en page(s) : p. 227-234 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie
Cuir -- Teneur en formaldéhyde
Cuirs et peaux -- Analyse
Nanoparticules
Or
Produits chimiques -- DétectionIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A rapid and sensitive approach for colorimetric sensing of formaldehyde in aqueous solutions and leather has been developed based on the morphology-dependent localised surface plasmon resonance (SPR) properties of gold nanorods (AuNRs). The method relied on amalgamation between elemental mercury (Hg°) and AuNRs to generate significant colour change, which was dependent on the amount of Hg°. Upon formaldehyde introduction into the mixed solution of Hg2' and gold nanorods, formaldehyde would reduce Hg2+ to Hg° in an alkaline environnent, which results in the longitudinal plasmon wavelength of gold nanorods to blue shift accompanying a perceptible colour change from blue-green to purple. Under optimal conditions, the linear correlation could be fitted between 3.)%. and the concentration of formaldehyde ranging from 0.1 to 10mg/L with a linear correlation coefficient of 0.992. Relevant experimental parameters, including pH, concentrations of Hg2+, reaction time were evaluated. Meanwhile, the sensing mechanism for the detection of formaldehyde has been discussed. Due to its great applicability, simplicity and rapidity, the proposed colorimetric approach is promising to be applied to formaldehyde determination in leather. Note de contenu : - EXPERIMENTAL PROCEDURES : Chemical and instrumentation - Synthesis of AuNRs - Formaldehyde detection
- RESULTS AND DISCUSSION : Sensing mechanism - Optimisation of experimental conditions - Detection of formaldehyde - Selectivity of the sensing system - Detection of formaldehyde in tap water - A preliminary study on the detection of formaldehyde in leatherEn ligne : https://drive.google.com/file/d/12le_z8Vh3wAfAFtlL3Z9lZ-gqtyuzIB-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34523
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Code-barres Cote Support Localisation Section Disponibilité 22289 - Périodique Bibliothèque principale Documentaires Disponible Dry heat resistance of hide and leather / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 5 (05/2003)
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Titre : Dry heat resistance of hide and leather Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Jian Cao, Auteur ; F. Wang, Auteur ; Jie Liu, Auteur Année de publication : 2003 Article en page(s) : p. 168-172 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, the dry heat resistance of hide and leather is studied by means of thermal platform microscope. Such factors as drying, tanning, types of tanning agents and tannage degree that may affect the dry heat resistance of hide and leather are included. Changes and mechanisms of samples when dry heated are analyzed and discussed. We use KCrSO4, CrCl3, Cr(NO3)3 and Sugar reduced chrome liquor as tanning agents to study tanning effects on the dry heat resistance of hide fiber. It can be found that chrome tanning may reduce the initial shrinkage temperature, and increase the final shrinkage temperature. It is to say that chrome tanning may broaden the shrinkage range of hide fiber. Dry heat resistance of hide fibers with different degrees of tanning is also studied. Shrinkage ratio of hide fiber tanned with KCrSO4 decreases with increasing KCrSO4 concentration in the tanning liquors. Hide fiber tanned with sugar -reduced chrome liquor posseses the best dry heat resistance in all the four kinds of tanned hide fiber samples studied. En ligne : https://drive.google.com/file/d/1-GYy6UELCOng4wCs7e5IBk7aASQ5CREu/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4119
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Code-barres Cote Support Localisation Section Disponibilité 001587 - Périodique Bibliothèque principale Documentaires Disponible Effect of cyclic stress on the structure and mechanical properties of leather / Keyong Tang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 4 (07-08/2020)
PermalinkEffect of cyclic stress while being dried on the mechanical properties and thermostability of leathers / Jinbao Huang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 10 (10/2018)
PermalinkEfficient and ecological leather processing : replacement of lime and sulphide with dispase assisted by 1-allyl-3-methylimidazolium chloride / Hui Liu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)
PermalinkHydrogen peroxide-oxidized soybean polysaccharides as novel masking agents for zirconium tanning / Haolin Zhu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 7 (07/2021)
PermalinkInfluence of retanning of the adsorption capacity of water on cattlehide collagen fibers / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 11 (11/2009)
PermalinkInfluence of sweat on hide and leather / Keyong Tang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 1 (01-02/2007)
PermalinkInfluence of sweat-soaking on the thermal stability of retanned and fatliquored cattlehide collagen fibers / Pengxiang Jia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 7 (07/2007)
PermalinkKCl-assisted enzyme in unhairing and collagen fibre bundle opening for cleaner leather making / Yafei Zhang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 5 (09-10/2020)
PermalinkKinetics and mechanism of thermal degradation of vegetable-tanned leather fiber / Jie Liu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 1 (Année 2019)
PermalinkMechanism of collagen processed with urea determined by thermal degradation analysis / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 10 (10/2020)
PermalinkModification and application of aminosiloxane in fatliquoring / Keyong Tang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)
PermalinkModification of collagen hydrosylate be edac / Keyong Tang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 1 (01-02/2008)
PermalinkModification of polyurethane finishing agent using collagen hydrolysate from chrome shavings / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 1 (01/2010)
PermalinkOptimization of dehairing/fiber opening using ammonium chloride/dispase by response surface methodology / Tang Chao in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 7 (07/2022)
PermalinkPreparation and properties of polyurethane finishing agent using butylamine as chain-extension agent / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 9 (09/2009)
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