Determination of N, N-dimethylformamide (DMF) in waterborne polyurethane by high performance liquid chromatography / Ren Keshuai in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 4 (07-08/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 4 (07-08/2016) . - p. 186-189 Titre : Determination of N, N-dimethylformamide (DMF) in waterborne polyurethane by high performance liquid chromatography Type de document : texte imprimé Auteurs : Ren Keshuai, Auteur ; Sang Jun, Auteur ; Yu Lingyun, Auteur ; Wang Chunhua, Auteur ; Wu Mengru, Auteur ; Lin Wei, Auteur Année de publication : 2016 Article en page(s) : p. 186-189 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie analytique Chromatographie en phase liquide à hautes performances Diméthylformamide Extraction (chimie) Polymères en émulsion Polyuréthanes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A simple and sensitive method using high performance liquid. chromatography (HPLC) has been developed for the determination of DMF in waterborne polyurethane (WPU) which is used in leather processing. Extraction of DMF is carried out by mechanical oscillation at room temperature for 10 minutes with water as the extraction solvent. Under optimal conditions, the limit of detection is 0.25mg L-1 and the recoveries are 95.2%~102.1%. The proposed method has been successfully applied to the determination of DMF in différent WPU samples. Note de contenu : - EXPERIMENTAL PROCEDURE - APPARATUS : Reagents - Extraction - HPLC conditions - Quantification - RESULTS AND DISCUSSION : The standard curve of DMF - Effect of extraction method - Effect of extraction temperature - Effect of extraction time - Recoveries and precision En ligne : https://drive.google.com/file/d/1KIVP6R5Z9Ojj-C2LsaWFb1wutp9-lcws/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26796 [article]

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Effect of novel synthetic clay on the property of waterborne polyurethane leather finishing agent: enhanced thermal, mechanical and UV-resistant performance / Wang Chunhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 3 (05-06/2018) . - p. 155-159 Titre : Effect of novel synthetic clay on the property of waterborne polyurethane leather finishing agent: enhanced thermal, mechanical and UV-resistant performance Type de document : texte imprimé Auteurs : Wang Chunhua, Auteur ; Mu Changdao, Auteur ; Lin Wei, Auteur Année de publication : 2018 Article en page(s) : p. 155-159 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Cuirs et peaux -- Finition Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés thermiques Laponite Polymères en émulsion Polyuréthanes Résistance au rayonnement ultraviolet Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Waterborne polyurethane/laponite composites used for leather finishing have been prepared via the solution mixing method. The dispersion stability of laponite and composite emulsions were determined by atomic force microscopy (AFM) and dynamic light scattering (DLS). Thermogravimetric analysis (TGA), tensile testing and UV-Vis spectra were used to test the performance of the resulting films. The results indicate that the nano-particles with negative charges can form highly stable aqueous dispersion under alkaline condition and exhibit good compatibility with anionic waterborne polyurethanes. The emulsions possess good storage stability with an average particle diameter of 80-94nm. The uniformly dispersed clay platelets can markedly improve the thermal stability and mechanical properties of the composites. In addition, the incorporation of small-sized clay is capable of maintaining the transparent appearance of the film and giving an UV-resistant property. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of polyurethane/laponite (LPU) emulsions and films - Characterisation of laponite, WPU and LPU - RESULTS AND DISCUSSION : Dispersion stability of laponite - Stability of polyurethane emulsions - Thermal stability - Mechanical property measurement - UV-Vis spectra analysis En ligne : https://drive.google.com/file/d/1qbu9GWV-X22_dw3rlg9nh36Ku5k4rKOM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30797 [article]

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Evaluation of environmental impact of typical leather chemicals. Part 3 : Biodegradability of vegetable tannin extracts by activated sludge / Qiang He in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 3 (05-06/2008)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 3 (05-06/2008) . - p. 103-106 Titre : Evaluation of environmental impact of typical leather chemicals. Part 3 : Biodegradability of vegetable tannin extracts by activated sludge Type de document : texte imprimé Auteurs : Qiang He, Auteur ; Danhong Sun, Auteur ; Xin Liu, Auteur ; Lin Wei, Auteur ; Bi Shi, Auteur Année de publication : 2008 Article en page(s) : p. 103-106 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biodégradation Boues résiduaires -- Analyse Cuirs et peaux -- Industrie -- Aspect de l'environnement Déchets industriels -- Elimination Environnement -- Etudes d'impact Tanins végétaux Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The short-term (5 day) and long-term (30 day) biodegradation behaviours of black wattle, bayberry, valonia and chestnut tannin extracts were systematically investigated in this paper. The results indicated that all of these four vegetable tannin extracts are biodegradable although they might retard the biodegradation process to some extent owing to the inhibitory effect of tannins on the activated sludge process. Short-term biodegradabilities of the four tannin extracts were concentration-dependent. These tannin extracts could be effectively biodegraded in 5 days at concentrations of 0.25g/L, but the biodegradation process was retarded remarkably when the concentrations were increased to 5.00g/L. In general, short-term biodegradabilities of the four tannin extracts follow the sequence of valonia tannin>chestnut tannin>bayberry tannin>wattle tannin, implying that the hydrolysable tannins are easier to biodegrade than the condensed tannins. The results of long-term biodegradation showed that all of the four vegetable tannin extracts can be completely biodegraded by prolonging the activated sludge process, even if they are present at high concentration. Therefore, the encouraging findings in this research suggest that vegetable tannin extracts are environmentally friendly leather chemicals. Note de contenu : - BOD5/COD values of vegetable tannin extracts - Respiration of activatedslud ge in the presence of vegetable tannin extracts - COD removals of vegetable tannin extracts by the activatedslud ge process - COD removals (%) of vegetable tannin extracts at different concentrations - Table 1 : Type andtannin content of vegetable tannin extracts tested in experiments - Table 2 : BOD5 /COD values of vegetable tannin extracts at different concentrations En ligne : https://drive.google.com/file/d/1rkdcAB3YoMjEm3urqqTf-HjnXnzkK-x3/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38954 [article]

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Multifunctional carbon nanofiber systems mass produced from water soluble polymers / Lee D. Cremar in CHEMICAL FIBERS INTERNATIONAL, Vol. 66, N° 1 (03/2016)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > Vol. 66, N° 1 (03/2016) . - p. 40-42 Titre : Multifunctional carbon nanofiber systems mass produced from water soluble polymers Type de document : texte imprimé Auteurs : Lee D. Cremar, Auteur ; Javier Acosta-Martinez, Auteur ; Alexsandra Villarreal, Auteur ; Alfonso Salinas, Auteur ; Lin Wei, Auteur ; Yuanbing Mao, Auteur ; Karen Lozano, Auteur Année de publication : 2016 Article en page(s) : p. 40-42 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Conduction électrique Fibres de carbone Hydrophobie Matériaux poreux Nanofibres Nontissés Oléophilie Solutions de polymère Stabilité thermique Thermogravimétrie Résumé : The high cost of polymer precursors, usage of organic solvents and/or energy consumption during carbonization post-processes has limited the use of carbon fiber systems for every day applications. Here, nonwoven nanofiber mats are developed utilizing the Forcespinning technology and subsequently exposed to acid vapor induced dehydration and low temperature carbonization (T < 800 °C) processes to produce multifunctional fine carbon fibers. This method allows for the production of highly porous nonwoven carbon cloths or yarns with micro- and mesoporosity. The fiber diameter can be tuned in the range of hundreds of nanometers to several microns. Thermophysical and microstructural characterization indicate graphitic formation due to carbonization that occurs during the chemical and heat treatment. The developed system shows high electrical conductivity, high surface area, thermal stability, hydrophobicity, and oleophilic behavior. En ligne : https://drive.google.com/file/d/1-MLQlexnUDaPandtoAvzA3bW7YI4Dxu2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25846 [article]

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Multifunctional carbon nanofiber systems mass produced from water soluble polymers / Lee D. Cremar in CHEMICAL FIBERS INTERNATIONAL, (09/2016)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > (09/2016) . - p. 71-73 Titre : Multifunctional carbon nanofiber systems mass produced from water soluble polymers Type de document : texte imprimé Auteurs : Lee D. Cremar, Auteur ; Javier Acosta-Martinez, Auteur ; Alexsandra Villarreal, Auteur ; Alfonso Salinas, Auteur ; Lin Wei, Auteur ; Yuanbing Mao, Auteur ; Karen Lozano, Auteur Année de publication : 2016 Article en page(s) : p. 71-73 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carbonisation Déshydratation Fibres de carbone Matériaux poreux Nanofibres Nontissés Polymères -- Synthèse Technique de la production Index. décimale : 677.4 Textiles artificiels Résumé : The high cost of polymer precursors, usage of organicsolvents and/or energy consumption during carbonization post-processes has limited the use of carbon fiber systems for every day applications. Here, nonwoven nanofiber mats are developed utilizing the Forcespinning technology and subsequently exposed to acid vapor induced dehydration and low temperature carbonization (T C 800 °C) processes to produce multifunctional fine carbon fibers. This method allows for the production of highly porous nonwoven carbon cloths or yarns with micro- and mesoporosity. The fiber diameter can be tuned in the range of hundreds of nanometers to several microns. Thermophysical and microstructural characterization indicate graphitic formation due to carbonization that occurs during the chemical and heat treatment. The developed system shows high electrical conductivity, high surface area, thermal stability, hydrophobicity, and oleophilic behavior. En ligne : https://drive.google.com/file/d/1CZ5uOtnGzkESX329OXzY6LNEkdC3U9u7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26937 [article]

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A novel approach for wet-white leather manufacture based on tannic acid-laponite nanoclay combination tannage / Jiabo Shi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 1 (01-02/2016)  

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Preparation and properties of anti-biofouling zwitterionic polyurethane leather coating / Wang Chunhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 1 (01-02/2017)  

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Rapid determination of 2-butanone, 2-pyrrolidone and N-methyl pyrrolidone in leather by UPLC / Yu Lingyun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 4 (07-08/2014)  

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Rapid determination of glutaraldehyde in leather by UV spectrophotometry reverse flow injection system / Yu Lingyun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 5 (09-10/2014)  

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Rapid determination of six aldehydes in leathers by ultra performance liquid chromatography / Yu Lingyun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 4 (07-08/2013)  

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