Effects of polyacrylic acid on the structure of collagen fibre / Zou Xianglong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 4 (07-08/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 4 (07-08/2014) . - p. 172-176 Titre : Effects of polyacrylic acid on the structure of collagen fibre Type de document : texte imprimé Auteurs : Zou Xianglong, Auteur ; Lan Yunjun, Auteur ; Zhang Qinghua, Auteur ; Li Zhongyu, Auteur ; Zhang Xiaoli, Auteur Année de publication : 2014 Article en page(s) : p. 172-176 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide polyacrylique Analyse thermique Collagène Cuirs et peaux de moutons Diffractométrie de rayons X Microscopie électronique à balayage Microscopie électronique en transmission Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The effects of polyacrylic acid (PAA) on the hierarchical structure of sheepskin collagen fibres were investigated by using of transmission electron microscope (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). It was found that although the unique axial periodic (d periodicity) structure of collagen fibrils and orderly arrangement of collagen molecule did not change obviously alter the introduction of PAA, the aggregation behaviour of collagen fibres was greatly influenced. With increasing concentration of PAA, the order of intermolecular lateral packing decreased, the shrinkage of the leather lessened [from changes in surface morphology observed by SEM] and the dry heat stability of collagen fibre declined due to a decrease in the orderly degree of collagen fibre aggregation. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of PAA - Experimental procedure and characterization - RESULTS AND DISCUSSION : TEM - SEM - XRD - DSC En ligne : https://drive.google.com/file/d/1Kql2Xrhdh5La-mewKh0DfUdKNDtREK84/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21818 [article]

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Synthesis and mechanical properties of polyacrylic acid resin retanning agent / Zou Xianglong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 3 (05-06/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 3 (05-06/2014) . - p. 127-130 Titre : Synthesis and mechanical properties of polyacrylic acid resin retanning agent Type de document : texte imprimé Auteurs : Zou Xianglong, Auteur ; Lan Yunjun, Auteur ; Zhang Qinghua, Auteur ; Zhan Xiaoli, Auteur Année de publication : 2014 Article en page(s) : p. 127-130 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide polyacrylique Analyse mécanique dynamique Caractérisation Humidité -- Absorption Polymères -- Synthèse Retannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Polyacrylic acid retanning agent (PAA), PAA-1 and PAA-2 with weight average molecular weights (Mw) of 14.4 x 103 and 23.1 x 103g/mol respectively, were prepared by water solution homopolymerization of acrylic acid monomer. The effects of molecular weight and moisture absorbency on glass transition temperature (T) and mechanical properties of PAA were investigated. The results showed that PAA-1 and PAA-2 have similar capacity for moisture absorbency, namely about 14.5% at 20°C(T=20°C) and 65% relative humidity (RH=65%). After equilibrating for 48 hours at T=20°C, RH=65%, the T of PAA-1 and PAA-2 fell from 86.17°C and 90.71°C to -11.44°C and -3.09°C respectively. Dynamic mechanical analysis (DMA) showed the storage moduli of PAA-1 and PAA-2 were significantly decreased at -26.99°C and -8.78°C respectively, the storage modulus of PAA-2 was higher than that of PAA-1 due to its higher molecular weight. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of PAA - Experimental procedure and characterization - RESULTS AND DISCUSSION : FT-IR analysis - Moisture absorption of PAA - DMA En ligne : https://drive.google.com/file/d/1o6rYJ3cgN9-nNdNj-T2EIrXpE4U7QbBG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21533 [article]

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