Investigation of the synthesis of a novel glycidyl ether-amine epoxy tanning agents and their tanning performance / Xiaoyan Pang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 6 (06/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 6 (06/2019) . - p. 228-239 Titre : Investigation of the synthesis of a novel glycidyl ether-amine epoxy tanning agents and their tanning performance Type de document : texte imprimé Auteurs : Xiaoyan Pang, Auteur ; Zhiwen Ding, Auteur ; Wei Ding, Auteur ; Xiao Xiao, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2019 Article en page(s) : p. 228-239 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage Caractérisation Composés organiques -- Synthèse Epoxydes Evaluation Poids moléculaires Rhéologie Structure chimique Tannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Isophorone diamine (IPDA) and epichlorohydrin (ECH) were used to fabricate the epoxy tanning agents, and polyalcohol compounds (glycerol, polyethylene glycol, ethylene glycol) were employed to introduce the ether bonds into the epoxy tanning agents to improve their compatibility with water. The prepared epoxy tanning agents were named IGE, IPE and IEE for the introduction of glycerol, polyethylene glycol and ethylene glycol, respectively. FT-IR and 1H NMR analysis indicated that epoxy groups, ether bonds and hexatomic rings were successfully introduced into IGE, IPE and IEE. The tanning performances of the epoxy tanning agents were further evaluated in water, ethanol-50 (50% of ethanol in water) and ethanol-95 (95% of ethanol in water) medium, which suggested that ethanol-50 was the most favorable one for the epoxy tanning agents. The IGE tanned leather exhibited the highest shrinkage temperature of 83ºC in ethanol-50 due to its low viscosity, high epoxy value and wide molecular dispersion. Morphology observation indicated that the IGE tanned leather exhibited better dispersion of fiber network than that of IPE and IEE tanned leathers. These results illustrated that IGE was an appropriate tanning agent in water-ethanol medium, which could be considered as a candidate for the organic tanning agents. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of epoxide tanning agents - Characterization of epoxide tanning agents Fourier Transform Infrared (FT-IR) spectriscopy - Molecular weight determination - H NMR analysis - Determination of viscosity - Tanning trials - Evaluation of tanning performance shrinkage temperature - Absorption rate of tanning agent - Physical properties - Scanning Electron Microscope (SEM) observation - RESULTS AND DISCUSSION : Chemical structure analysis - Molecular weight and viscosity of as prepared epoxides - Evaluation of the tanning performance of prepared epoxides - Optimization of IGE tanning conditions - Morphology observation of tanned leather - Physical properties En ligne : https://drive.google.com/file/d/1ChD8Sr0kJz6k2u-XCTG2lhvZxRPOOdZC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32655 [article]

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Polyelectrolytes fabrication on magnesium alloy surface by layer-by-layer assembly technique with antiplatelet adhesion and antibacterial activities / Mengke Peng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 3 (05/2019) . - p. 857-868 Titre : Polyelectrolytes fabrication on magnesium alloy surface by layer-by-layer assembly technique with antiplatelet adhesion and antibacterial activities Type de document : texte imprimé Auteurs : Mengke Peng, Auteur ; Xiaodan Zhang, Auteur ; Xiao Xiao, Auteur ; Mengjin Dong, Auteur ; Guowei Zhao, Auteur ; Peng Liu, Auteur ; Yashao Chen, Auteur ; Changhao Wang, Auteur Année de publication : 2019 Article en page(s) : p. 857-868 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion antiplaquettaire Antibactériens Anticorrosifs Anticorrosion Caractérisation Lysozyme Le lysozyme est une protéine globulaire formée de 129 acides aminés (chez l'être humain), que l'on rencontre dans un certain nombre de sécrétions (larmes, salive, lait maternel, mucus...) et dans le blanc d'Å“uf, chez de nombreuses espèces d'animaux, dont insectes et acariens1. Il s'agit d'une hydrolase acide (EC 3.2.1.17) sécrétée par les granulocytes et les monocytes. Elle détruit la paroi bactérienne en catalysant l'hydrolyse des peptidoglycanes la constituant. Magnésium -- Alliages Polyélectrolytes Polyéthylèneimine Revêtements multicouches Index. décimale : 667.9 Revêtements et enduits Résumé : Magnesium alloy (MgA) was widely used in biomedical field owing to its good biocompatibility and degradability. The surface of MgA was usually modified to improve its corrosion resistance, biocompatibility, and biological properties. Herein, we employed a layer-by-layer assembly technique to assemble both polyanionic and polycationic electrolytes onto the microarc oxidation-treated MgA surface to yield MgA-MgO-PEI-[Ge(HANPs)/Lzm]50, where the gelatin-conjugated hydroxyapatite nanoparticles [Ge(HANPs)] are the polyanionic electrolyte, lysozyme (Lzm) is the polycationic electrolyte, and polyethyleneimine (PEI) is the transition layer. The morphology and chemical composition of MgA-MgO-PEI-[Ge(HANPs)/Lzm]50 were characterized by X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, indicating that [Ge(HANPs)/Lzm]50 were successfully fabricated on the surface of MgA-MgO. The surface of MgA-MgO-PEI-[Ge(HANPs)/Lzm]50 exhibited good hydrophilicity as evidenced by the low water contact angle of 24.5°. Excellent corrosion resistance of MgA-MgO-PEI-[Ge(HANPs)/Lzm]50 was obtained since it can decrease about four orders of magnitude of corrosive current (Icorr) compared to pristine MgA. The biological assay for MgA-MgO-PEI-[Ge(HANPs)/Lzm]50 showed good antiplatelet adhesion and excellent antibacterial activities against both E. coli and S. aureus. Note de contenu : - EXPERIMENTAL : Materials - Preparation of hydroxyapatite nanoparticles (HANPs) - Preparation of MgA with MAO treatment (MgA-MgO - Preparation of MgA-MgO-PEI[Ge(HANPs)/Lzm]50 - Characterizations for morphologies and composition - Water contact angle (WCA) measurement - Potentiodynamic polarization test - Antiplatelets adhesion assay - Antibacterial assay - Determination of release of lysozyme - RESULTS AND DISCUSSION : Morphology and phase structure of HANPs - Morphology and composition of different MgA samples - Hydrophilicity analysis of different MgA samples - Anticorrosive performance of MgA-MgO-PEI[Ge(HANPs)/Lzm]50 - Antiplatelets adhesion assay of MgA-MgO-PEI[Ge(HANPs)/Lzm]50 - Antibacterial assay of MgA-MgO-PEI[Ge(HANPs)/Lzm]50 - Lysozyme release behavior of MgA-MgO-PEI[Ge(HANPs)/Lzm]50 DOI : 10.1007/s11998-018-00162-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00162-6.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32597 [article]

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