Effect of temperature on moisture-penetrability and breathability of natural leather from microstructure / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 6 (11-12/2017)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 6 (11-12/2017) . - p. 280-283 Titre : Effect of temperature on moisture-penetrability and breathability of natural leather from microstructure Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Nian Liu, Auteur ; Jiang Xuewei, Auteur ; Xu Wei, Auteur Année de publication : 2017 Article en page(s) : p. 280-283 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Effets de la température Cuirs et peaux -- Propriétés thermomécaniques Humidité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This article utilizes the Tinker software to simulate the microspatial structure of type III collagen (1bkv) in natural leather. The four simulation environment temperatures were set at 300K, 320K, 340K, 360K te analyse the relevant trend of variation of coordination number (CN) and interatomic distance (Dis) and the number of interatomic distance (Dis No) of the lbkv collagen whole atom at the different temperatures. The results shows that with the increase of temperature the CN increases tao. As the CN value of 1bkv collagen increased gradually from 125 to 350, the floating frequency of Dis No increases with the increase of simulation time. But 0.5-0.6ns is the inflection lime et simulation. When the temperature increased to 360K, the corresponding Dis No obviously increased while, when the temperature is less than 360K, the change of Dis No is not obvious. This phenomenon shows that temperature is an important factor which affects the Dis No of collagen molecules. The increase of temperature makes the inner spatial structure of collagen molecules become smaller, which explains that, as the temperature rises to a certain value, the naturel leather's moisture-penetrability and breathability decreases. Note de contenu : - The variation tendency of CN of 1bkv collagenmolecules at different temperatures - The change trend of Dis No of 1bkv collagen molecules at the simulation temperature En ligne : https://drive.google.com/file/d/1i7WpvOrKlj6sBwd8SCe_e-YCvjntKbmn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29659 [article]

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Research on thermal stability, moisture and air permeability of natural leather based on the spatial conformation of the type 1 collagen molecule / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 5 (09-10/2017)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 5 (09-10/2017) . - p. 250-252 Titre : Research on thermal stability, moisture and air permeability of natural leather based on the spatial conformation of the type 1 collagen molecule Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Nian Liu, Auteur ; Xuewei Jian, Auteur ; Jingjing Li, Auteur Année de publication : 2017 Article en page(s) : p. 250-252 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène Cuirs et peaux -- Analyse Humidité Perméabilité Stabilité thermique Structure moléculaire Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The spatial conformation model of type I collagen molecules (1 cgd) is simulated at different temperatures on the basis of Amber software firstly. Then the refationship between structure stability and the moisture permeability and air permeability of naturel leather and temperature change is researched further : Thirdly, Setting 298K, 338K, 378K and 418K as simulation temperature, the change regulation of Root Mean Square Deviation (RMSD.) [the manner in which the RMSD of 1 cgd increases with rase in lemperature] and Radius of Gyration (RG) at four kinds of temperatures are researched respectively. These researches indicate that deviation level of the molecular structure of type I collagen is different from the original molecular structure at room temperature with the increase of temperature, and the structural stability of collagen molecules decreased with the increase of temperature, and the molecular structure of proteins becomes more compact. The study result is consistent with thermal shrinkage and wrinkling phenomenon of leather in macroscopic experiment. Note de contenu : - EXPERIMENTAL METHODS : Simulation software - Simulation parameters - RESEARCH METHODS AND THEORIES - RMSD : Rg - RESULTS AND ANALYSIS : RMSD analysis En ligne : https://drive.google.com/file/d/1_veA0YkiABmrgB_3dyfURmBYVkgsF3OZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29240 [article]

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