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Auteur Liu Xinhua
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National Engineering Laboratory for Clean Technology of Leather Manufacture - Sichuan University - Chengdu - China
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Application of amphoteric polymers in the process of leather post-tanning / Xuechuan Wang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
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inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 9 p.
Titre : Application of amphoteric polymers in the process of leather post-tanning Type de document : texte imprimé Auteurs : Xuechuan Wang, Auteur ; Sun Siwei, Auteur ; Xing Zhu, Auteur ; Guo Peiying, Auteur ; Liu Xinhua, Auteur ; Chunlin Liu, Auteur ; Meng Lei, Auteur Année de publication : 2021 Article en page(s) : 9 p. Langues : Anglais (eng) Catégories : Agents de tannage
Composés amphotériques
Cuirs et peaux
Polymères -- Synthèse
Post-tannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : With the characteristics of controllable charge and environmental friendliness, amphoteric polymers can be used in post-tanning process to solve the problems that arise during leather making and are caused by the low absorption rate of single-charge chemicals, incompatibility with new tanning methods, and complex operation process. In this review, the structure, performance, and preparation of amphoteric polymers are reported. Then, the charge change of collagen during different tanning and pH treatments is introduced. Finally, the application and development of amphoteric polymers during the post-tanning process of leather making are discussed. This review has certain guiding significance to the preparation and application of amphoteric polymers for tanning system. Note de contenu : - STRUCTURE, PROPERTIES, AND SYNTHESIS METHODS OF AMPHOTERIC POLYMERS : Structure and properties of amphoteric polymers - Synthetic methods of amphoteric polymers
- AMPHOTERIC PROPERTIES OF COLLAGEN AFTER TANNING :
- RESEARCH PROGRESS OF AMPHOTERIC POLYMER DURING POST-TANNING : Retanning agent - Fatliquoring agent - Other materials
- CONCLUSIONS AND PROSPECTS : Development of amphoteric polymers with different structures for leather making - Study on the interaction mechanism between amphoteric polymers and leather
Exploration of characterization methods - Clean application process of amphoteric materials in post-tanningPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37474 [article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Development of chrome-free tanning in supercritical CO2 fluid using Zr-Al-Ti complex / Liu Xinhua in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 12 (12/2016)
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inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 12 (12/2016) . - p. 447-454
Titre : Development of chrome-free tanning in supercritical CO2 fluid using Zr-Al-Ti complex Type de document : texte imprimé Auteurs : Liu Xinhua, Auteur ; Feng Li, Auteur ; Qin Huang, Auteur ; Weihua Dan, Auteur ; Nianhua Dan, Auteur Année de publication : 2016 Article en page(s) : p. 447-454 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage
AluminiumL'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite.
L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement.
L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium.
Complexes métalliques
Cuirs et peaux -- Analyse
Cuirs et peaux -- Propriétés mécaniques
Dioxyde de carbone
Fluides supercritiques
Tannage
Titane
ZirconiumIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In the current study, a green technology for the leather tanning process was developed, based on Zr-AI-Ti complex as a tanning agent in supercritical CO, fluid (SCF-0O3). The operating parameters in the tanning process, including dosage of the tanning agent, reaction time, tanning temperature and tanning pressure, were optimized using the orthogonal testing method. The physicochemical properties, morphological features, organoleptic properties, hydrothermal stability and microscopie fibrous construction of the Zr-Al-T1 tanned leather were also evaluated. The results showed that the optimum process conditions were : a tanning agent dosage of 40% of the bated pelt weight, a tanning time of 1.5h, a final temperature of 40°C and a reaction pressure of 8.5 MPa. The shrinkage temperature, tear strength, tensile strength and elongation at break of Zr-Al-Ti tanned leather in water media and in SCF-CO, exhibited no statistically significant differences. However, SEM and histological observations revealed that the fiber bundles of leather tanned using the Zr-Al-Ti complex tanning agent in SCF-CO, seemed to disperse more unevenly compared to those in water media, as well as conventional chrome tanned leather. Moreover, the degree of "opening up" of the fiber bundles and the visible interspace among them in the Zr-Al-Ti tanned leather in SCF-CO, seemed to be ranch larger. Based on these results, we infer that the chrome-free tanning process in SCF-CO, may endow similar leather characteristics compared to Zr-Al-Ti tanned leather in a water medium, which could effectively reduce the discharge of waste water compared to a conventional chrome tanning process, thus contributing to the development of a greener, or cleaner, technology for the leather tanning process. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of Zr-Al-Ti complex tanning agent - Leather tanning process - Shrinkage temperature analysis - ICP analysis - Microstructure characteristics - Physical-mechanical properties and organoleptic assessment - Chemical composition analysis
- RESULTS AND DISCUSSION : Orthogonal experiment analysis - Shrinkage temperature analysis - ICP analysis - Physical-mechanical properties analysis - Chemical composition analysis - Microstructure characteristicsEn ligne : https://drive.google.com/file/d/1q99ZAL0R0EXzAXCF3TJMFKSFdZ6diIH6/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27326 [article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18529 - Périodique Bibliothèque principale Documentaires Disponible Effect of hydrophilic or hydrophobic interactions on the self-assembly behavior and micro-morphology of a collagen mimetic peptide / Xiaomin Luo in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
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inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 10 p.
Titre : Effect of hydrophilic or hydrophobic interactions on the self-assembly behavior and micro-morphology of a collagen mimetic peptide Type de document : texte imprimé Auteurs : Xiaomin Luo, Auteur ; Qianqian Huo, Auteur ; Liu Xinhua, Auteur ; Chi Zheng, Auteur ; Ying Liu, Auteur Année de publication : 2021 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie biomimétique
Collagène
Dynamique moléculaire
Hydrophilie
Hydrophobie
Morphologie (matériaux)
Peptides
Systèmes auto-assemblésIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Peptide self-assembles with bionic properties have been widely utilized for bioactive drugs and biomedical materials. Collagen mimetic peptide (CMP) gains more attention due to its unique advantages in biosecurity and function. Unfortunately, the self-assembly mechanism of CMP, particularly the effect of intermolecular forces on its self-assembly behavior and morphology, is still unrecognized. Herein, the hydrophilic glycidol (GCD) and hydrophobic Y-glycidyl ether oxypropyl trimethoxysilane (GLH) were grafted onto the side chains of CMP through the ring-opening reaction (GCD/CMP, GLH/CMP). Subsequently, the effects of hydrophilic and hydrophobic interactions on the self-assembly behavior and morphology of CMP were further studied. The results substantiated that the GCD/CMP and GLH/CMP self-assembly followed “nucleation-growth” mechanism, and the supererogatory hydrophilic and hydrophobic groups prolonged the nucleation and growth time of CMP self-assembly. Noted that the hydrophilic interaction had stronger driving effects than hydrophobic interaction on the self-assembly of CMP. The GCD/CMP and GLH/CMP self-assembles exhibited fibrous 3D network and microsphere morphology, respectively. Furthermore, the GLH/CMP self-assembles had better resistance to degradation. Consequently, the microtopography and degradation properties of CMP self-assembles could be controlled by the hydrophilic and hydrophobic interactions between CMP, which would further provide a way for subsequent purposeful design of biomedical materials. Note de contenu : - EXPERIMENTS : Materials - Preparation of GCD/CMP, GLH/CMP and their homologous assemblies - Structural characterization of GCD/CMP, GLH/CMP - Self-assembly kinetics of GCD/CMP and GLH/CMP assemblies - Mico-morphology analysis of GCD/CMP and GLH/CMP assemblies - Performance characterization of GCD/CMP and GLH/CMP assemblies
- RESULTS AND DISCUSSION : Preparation and structural analysis of GCD/CMP and GLH/CMP - The self-assembly behavior of CMP, GCD/CMP and GLH/CMP - Performance analysis of CMP, GCD/CMP and GLH/CMP assemblies
- Table 1 Self-assembly rates of CMP, GCD/CMP and GLH/CMPDOI : https://doi.org/10.1186/s42825-020-00054-3 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00054-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37476 [article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Network structure and thermotropic property of type I collagen fibrils / Ju Haiyan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 6 (11-12/2012)
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inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 96, N° 6 (11-12/2012) . - p. 234-238
Titre : Network structure and thermotropic property of type I collagen fibrils Type de document : texte imprimé Auteurs : Ju Haiyan, Auteur ; Wu Nan, Auteur ; Liu Xinhua, Auteur ; Dan Nianhua, Auteur ; Dan Weihua, Auteur Année de publication : 2012 Article en page(s) : p. 234-238 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fibrille des collagène -- Propriétés thermotropes La 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.
Hydrolyse enzymatiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The collagen fibril (CF) is a hot topic in biomedical materials and tissue engineering research because of its physicochemical properties and biological performance. In this paper, Type I CF was successfully prepared by the acid-enzyme hydrolysis method. The samples prepared were subjected to atomic force microscope examination (AFM), infrared spectroscopic analysis (FTIR) and histological staining.
AFM and histological staining results showed that CF had uniform thickness with a diameter of 135nm +- 5.00nm, and enjoyed the D cycle horizontally banded structure that is typical in Type I CF. At 45°C, significant changes occur to the secondary structure of collagen, when the temperature reaches 60°C, the supramolecular networks and triple helical structures of CF are completely destroyed. The results provide new and reliable theoretical grounds for processing, moulding, and application.Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of collagen fibrils - Characterization
- RESULTS AND DISCUSSION : Images analysis of Type I collagen fibrils - Histological staining observations - FTIR spectra analysisEn ligne : https://drive.google.com/file/d/1TvJPtb0eBSZdVjvicMrUpFeaHMcOHZwq/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16802 [article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14414 - Périodique Bibliothèque principale Documentaires Disponible