Poly(N-acryloyl ciprofloxacin-co-acrylic acid)-incorporated waterborne polyurethane leather coating with long-lasting antimicrobial property / Jinming Chang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 1 (01/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 1 (01/2017) . - p. 15-22 Titre : Poly(N-acryloyl ciprofloxacin-co-acrylic acid)-incorporated waterborne polyurethane leather coating with long-lasting antimicrobial property Type de document : texte imprimé Auteurs : Jinming Chang, Auteur ; Gaofu Yang, Auteur ; Qi Zeng, Auteur ; Zhonghui Wang, Auteur ; Zhou Xu, Auteur ; Yi Chen, Auteur Année de publication : 2017 Article en page(s) : p. 15-22 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Copolymères -- Synthèse Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Finition Polymères -- Synthèse Polymères en émulsion Polyuréthanes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : o overcome the leaching problem associated with low-molecular-weight antimicrobial agents, a water soluble antimicrobial polymer, poly(N-acryloyl ciprofloxacin-co-acrylic acid), was designed and synthesized via acryloylation of the secondary amine in 7-piperazinyl substituent of ciprofloxacin and subsequent copolymerization with acrylic acid. The structure of the copolymer was characterized by 1H nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR) spectra, X-ray photoelectron spectroscopy (XPS), and gel permeation chromatography (GPC). The copolymer was compatible with waterborne polyurethane for leather finishing, and remained antimicrobial even though the parent structure of ciprofloxacin molecule was altered. When incorporated into waterborne polyurethane leather coating as an antimicrobial agent, poly(N-acryloyl ciprofloxacin-co-acrylic acid) proved seldom leached out from the coating even after being rinsed for ten times. Based on these results, the water soluble antimicrobial copolymer designed in this study may prevent depletion of antimicrobial function of waterborne polyurethane leather coating, extending the lifetime of the leather products and enhancing their hygiene properties. Note de contenu : - Materials - Preparation of N-acryloyl ciprofloxacin (NACPF) - Synthesis of Poly(N-acryloyl ciprofloxacin-co-acrylic acid) - Characterization of Poly(NACPF)-co-AA) - Crust leather finishing by Poly(NACPF)-co-AA) incorporated WPU - Scanning Electron Microscope (SEM) observatin - Bactericidal test - Statistics En ligne : https://drive.google.com/file/d/123bCchShzKFoVumI-TtZ60-U7yV0pE91/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27565 [article]

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Preparation and characteristics of graphene-based polymeric leather fatliquor / Zhenyu Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 9 (09/2020)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 9 (09/2020) . - p. 337-346 Titre : Preparation and characteristics of graphene-based polymeric leather fatliquor Type de document : texte imprimé Auteurs : Zhenyu Zhang, Auteur ; Mengjie Cui, Auteur ; Zhonghui Wang, Auteur ; Haojun Fan, Auteur ; Yi Chen, Auteur ; Jun Xiang, Auteur ; Jun Yan, Auteur ; Jixin Ning, Auteur Année de publication : 2020 Article en page(s) : p. 337-346 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Blindage (électricité) Caractérisation Essais (technologie) Essais de comportement au feu Oxyde de graphène Produits de nourriture du cuir Résistance au rayonnement ultraviolet Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Although the research of leather chemicals has experienced considerable advances, it remains imperative and challenging to develop functional ones ; especially functionalized fatliquors or retanning agents. In consideration with the unique structure and properties, graphene oxide (GO) has been reported as a potential alternative to ameliorate the performance of leather. However, one of the intractable handicaps is how to make graphene penetrate evenly and react with collagen fibers. Here, we demonstrate a method for preparing graphene-based polymeric fatliquor (PFGO) via an amidation reaction between amino-groups of aminated graphene (AGO) and anhydride bonds of maleic anhydride-rapeseed ouf copolymer (MRO), which was synthesized by free radical copolymerization. The results show that the as-prepared fatliquor has good emulsion stability and can penetrate into the collagen fibers uniformly. Compared with the control sample without graphene, the antibacterial, electromagnetic shielding, flame retardant and UV resistance characteristics of the PFGO-treated leather were significantly improved. Overall, this effective yet promising paradigm may provide an achievable solution toward developing graphene-based polymer composites simultaneously with high physical property and high functional performance. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of GO based faltiquor (PFGO) - Fatliquoring process - CHARACTERIZATION AND PERFORMANCE TESTS : Instrument testing - Stability of fatliquor solution - SEM observation of leather - Antibacterial testing of fatliquor - Electromagnetic radiation shielding. Performance testing of leather - Flammability testing of leather - UV-resistance property testing of leather - Thermal stability testing of leather - Mechanical measurements - RESULTS AND DISCUSSION : Characterization of AGO - Characterization of fatliquor - Distribution of fatliquor in leather - Antibacterial property of fatliquor - Electromagnetic shielding performance of leather - Flammability of leather - UV-resistance of fatliquored leather DOI : https://doi.org/10.34314/jalca.v115i9.3849 En ligne : https://drive.google.com/file/d/1v5ccCkackiJzJmgK2tdNNEZKqF3muZUK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34587 [article]

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A simple approach with scale-up potential towards intrinsically flame-retardant bio-based co-plasticizer for PVC artificial materials / Yong Xu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 9 p. Titre : A simple approach with scale-up potential towards intrinsically flame-retardant bio-based co-plasticizer for PVC artificial materials Type de document : texte imprimé Auteurs : Yong Xu, Auteur ; Songhang Wang, Auteur ; Jinming Chang, Auteur ; Zhou Xu, Auteur ; Qi Zeng, Auteur ; Zhonghui Wang, Auteur ; Jun Yan, Auteur ; Yi Chen, Auteur Année de publication : 2020 Article en page(s) : 9 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomatériaux Chlore Chlorure de polyvinyle Cuir synthétique Esters méthyliques d'acides gras Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Plastifiants Index. décimale : 668.9 Polymères Résumé : As an imitation of genuine leather, polyvinyl chloride (PVC) artificial materials are versatile, but suffers from being flammable due to the presence of large amounts of combustible plasticizers. Under such circumstance, intrinsically flame-retardant plasticizers displaying dual functions have been a subject of intensive research interest. However, previous strategies attempting to covalently attach flame-retardant moiety to plasticizers invariably required either expensive starting materials or laborious and tedious procedures, ultimately limiting their scale-up application in industry. In addition, driven by escalating demand of halogen-free flame retardants worldwide from an environmental health perspective, previously reported intrinsically flame-retardant plasticizers were mainly halogen-free, less attractive in PVC artificial material industry simply because PVC itself is a halogen-containing polymer. Here, we report an approach to introduce chlorine moieties into unsaturated fatty acid methyl ester by a simple addition reaction occurring on carbon-carbon double bonds, yielding a chlorine-containing, intrinsically flame-retardant bio-plasticizer. When combined with di-(2-ethylhexyl) phthalate (DOP) in PVC formulations, the chlorinated fatty acid methyl ester is qualified as a co-plasticizer while conferring flame retardancy upon the PVC coatings. This approach involves only a one-step procedure that employs renewable fatty acid methyl esters and cheap chlorine gas as raw materials, thus being of great potential to enable intrinsically flame-retardant bio-plasticizers on a large scale to manufacture functional PVC artificial materials for application in fire-prone scenarios. Note de contenu : - Materials - Synthesis of chlorinated fatty acid methyl ester (CFAME) - Preparation of plasticized PVC coating - Characterization - Table 1 : Composition of PVC/CFAMEx - Table 2 : Composition of CFAME identified by comparing the experimental mass spectra of the components in Fig. 3 against NIST08 mass spectral library - Table 3 : Glass transition temperatures of PVC/CFAMEx coatings as determined by DMA analysis - Table 4 : TGA data of PVC/CFAMEx coatings DOI : https://doi.org/10.1186/s42825-020-00022-3 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00022-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37333 [article]

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Sustainable and invisible anti-counterfeiting inks based on waterborne polyurethane and upconversion nanoparticles for leather products / Jun Xiang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 11 p. Titre : Sustainable and invisible anti-counterfeiting inks based on waterborne polyurethane and upconversion nanoparticles for leather products Type de document : texte imprimé Auteurs : Jun Xiang, Auteur ; Jianxun Lin, Auteur ; Zhonghui Wang, Auteur ; Shenglin Zhou, Auteur ; Zhenya Wang, Auteur ; Qiang Yan, Auteur ; Yidong Liu, Auteur ; Haojun Fan, Auteur Année de publication : 2021 Article en page(s) : 11 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Contrefaçon -- Lutte contre Cuir Encre en phase aqueuse Mesures biophysiques Nanoparticules Polyuréthanes Produits commerciaux -- Contrefaçon Rayonnement infrarouge Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Counterfeit leather products infringe the intellectual property rights of the business, cause enormous economic loss, and negatively influence the business enthusiasm for innovation. However, traditional anti-counterfeiting materials for leather products suffer from complicated fabrication procedures, photobleaching, and high volatile organic compound (VOC) emissions. Here, a sustainable and invisible anti-counterfeiting ink composed of waterborne polyurethane and water-dispersible lanthanide-doped upconversion nanoparticles (UCNPs) featuring ease of preparation, high photostability, non-toxicity, low VOC emissions, and strong adhesion strength for leather products is designed and synthesized. After decorating on the surface of leather products, the obtained patterns are invisible under normal light conditions. Upon irradiation at 808 nm, the invisible patterns can be observed by naked eyes due to the visible light emitted by 808 nm excited UCNPs. Our approach described here opens a new pathway to realize the long-term, stable anti-counterfeiting function of leather products. Note de contenu : - MATERIALS AND METHODS : Materials - Experimental methods - Measurements - RESULTS AND DISCUSSION : OA-UCNPs nanoparticles - PVP-UCNPs nanoparticles - The WPU dispersion - The sustainable and invisible ACI - Application DOI : https://doi.org/10.1186/s42825-021-00076-x En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00076-x.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37558 [article]

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Thermally responsive collagen switching from bactericidal for ambient storage condition to biologically inert in vivo / Jinming Chang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 4 (04/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 4 (04/2018) . - p. 114-121 Titre : Thermally responsive collagen switching from bactericidal for ambient storage condition to biologically inert in vivo Type de document : texte imprimé Auteurs : Jinming Chang, Auteur ; Zhou Xu, Auteur ; Gaofu Yang, Auteur ; Zhonghui Wang, Auteur ; Yi Chen, Auteur ; Haojun Fan, Auteur Année de publication : 2018 Article en page(s) : p. 114-121 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Collagène -- Conservation Composés organiques -- Synthèse Poly(n-isopropylacrylamide) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Incorporating preservatives is now the most commonly employed strategy to prevent microbial deterioration of collagen. However, many preservatives are non-selective; they cannot differentiate the orthologs in mammalian cells from their biological targets in pathogens, and thus their incorporation compromises the inherent biocompatibility of naturally occurring collagen. Here, we report a strategy to covalently anchor antibacterial agents to collagen via a thermally responsive poly(N-isopropylacrylamide) spacer. As the spacer suddenly collapses from an extended coil upon heating through ~30°C, bioactivity of the anchored antibacterial agents can be switched off, because their lateral mobility and, hence, target-site accessibility are restricted. Accordingly, the modified collagen can be preserved without microbial deterioration for ambient storage condition, while imposing no cytotoxic impact upon surrounding tissues in vivo. This thermally responsive collagen holds great potential in biomedical fields, where the collagen products are intended to have intimate contact with human tissues or be administered parenterally. Note de contenu : - Materials - Synthesis of NHS ester-activated RAFT agent - Synthesis of N-acryloyl ciprofloxacin - Synthesis of PNIPAM-ciprofloxacin conjugate - Covalent anchoring of PNIPAM-ciprofloxacin conjugate onto collage - Characterization En ligne : https://drive.google.com/file/d/1tQt8XtEUmJ7NxBB2IyUcepNHuJXcEXyK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30340 [article]

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