Modification of collagen for high Cr(III) adsorption / Zhaoyang Luo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 4 (04/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 4 (04/2009) . - p. 149-155 Titre : Modification of collagen for high Cr(III) adsorption Type de document : texte imprimé Auteurs : Zhaoyang Luo, Auteur ; Bi Shi, Auteur ; Yuansen Liu, Auteur ; Haojun Fan, Auteur ; Zhang Xiuli, Auteur Année de publication : 2009 Article en page(s) : p. 149-155 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Collagen has an ability to coordinate with chromium (III) salts which is mostly determined by the amount of pendent carboxyl groups on the backbone of collagen. Based on this principle, when an oxazolidine derivative which contains carboxyl group and oxazolidine rig was sinthesized and used as a modification agent, a novel collagen fiberbased high Cr (III) adsorption material was developed. In contrast to unmodified collagen fiber, the hydrothermal stability of the modified collagen fiber increased from 63.1°C to 78.8°C and the maximum adsorption capacity (A max) of Cr3+ increased from 41mg/G(Cr3+/collagen) with a pH value of 4.0. In the waste water from a leather tannery treated with the modified collagen fiber, the Cr2O3 content decreased from 1.76/L to 0.06g/L. Investigation of high chromium adsorption mechanism indicates that the increased number of carboxyl groups attached to the backbone of collagen and the intrinsic carboxyl groups of collagen coordinate together with chromium (III) and form ui- or multi-point bound chromium complexes, which seems to contribute to the modified collagen high chromium (III) adsorption. En ligne : https://drive.google.com/file/d/17DaW2SoRgqBhQl4fw1JbOeE-PabaVk-2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4808 [article]

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Nano-TiO2 in-situ hybrid polyurethane with enhanced permeability for PU leather manufacture / Chen Yi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 6 (06/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 6 (06/2009) . - p. 222-231 Titre : Nano-TiO2 in-situ hybrid polyurethane with enhanced permeability for PU leather manufacture Type de document : texte imprimé Auteurs : Chen Yi, Auteur ; Zhang Xiuli, Auteur ; Haojun Fan, Auteur ; Bi Shi, Auteur Année de publication : 2009 Article en page(s) : p. 222-231 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A novel organic-inorganic nano-hybrid process combined with industrialized wet-phase inversion coating-forming method was developed for the modification of polyurethane (PU) leather coating with in-situ-generated nano-TiO2. The cross section morphologies, water vapor permeability, gas permeability, mesopore size distribution and specific surface area of the hybrid samples were investigated. SEM analysis indicated that when the TiO2 concentration increased from 0.25wt% to 1.00wt%, the average size of nano particles, which dispersed uniformly throughout the polymer matrix, increased correspondingly from 60-80nm to 90-120nm without obvious agglomerates observed. After nano hybridization, both water vapor and gas (hydrogen, nitrogen and oxygen) permeability of samples were found to increase with an increasing concentration of nano-TiO2, which was explained as voids formed at the polymer-nano particle interface due to phase incompatibility. The existence of such voids in samples was proven in the nitrogen adsorption/desorption experiment, by the detection of extra mesopores and higher specific surface area than predicted values. With industrial applicability in the manufacture of PU synthetic leather, the wet-phase inversion hybrid process developed in this study may be of great potential for improving the wear comfort of PU coated leather products. En ligne : https://drive.google.com/file/d/1LTDoSWaTJBLxAnAf8ybzWgidq7pSR9rK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5987 [article]

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Waterborne polyurethane/O-MMT nanocomposites for flame retardant leather finishing / Zhang Xiuli in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 2 (03-04/2010)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 94, N° 2 (03-04/2010) . - p. 77-83 Titre : Waterborne polyurethane/O-MMT nanocomposites for flame retardant leather finishing Type de document : texte imprimé Auteurs : Zhang Xiuli, Auteur ; Chen Yi, Auteur ; Haojun Fan, Auteur ; Bi Shi, Auteur Année de publication : 2010 Article en page(s) : p. 77-83 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Cetyltrimethylammonium bromide (CTAB) and 3-aminopropyltriethoxy-silane (APTES) were used as modifiers to prepare a reactive and organophilic montmorillonite (O-MMT), then from this waterborne polyurethane (WPU/O-MMT nanocomposite dispersions for leather flame retardant finishing were prepared through in-situ intercalation polymerization. Qualitative evidence of the presence of chemically-attached APTES on O-MMT is confirmed by FT-IR and an exfoliated structure of O-MMT in WPU matrix is confirmed by X-ray diffraction (XRD). The SEM analysis reveals that the O-MMT platelets are homogeneously dispersed throughout the polymer matrix when the O-MMT content is lower than 4wt%, whereas over 4wt%, inhomogeneous dispersion of the O-MMT platelets is observed. Performance study indicates that the incorporation of O-MMT,on one hand, is capable of enhancing the thermal stability and mechanical properties of WPU efficiently ; on the other hand, enhancing the flame retardancy of finished leathers. From the analysis of vertical flame and oxygen index (OI) test,the nanocomposite with 4wt% O-MMT loading shows the optimum flame retardant effect, the OI value increases by 3.6 units. En ligne : https://drive.google.com/file/d/1x0drpUMfrC-nn_fURNs-hjm2CrVZqRPh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9184 [article]

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