Determination of dimethyl fumarate in leather : purge-assisted headspace solid-phase microextraction coupled with GC-MS / Li Wang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 4 (07-08/2012)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 96, N° 4 (07-08/2012) . - p. 148-151 Titre : Determination of dimethyl fumarate in leather : purge-assisted headspace solid-phase microextraction coupled with GC-MS Type de document : texte imprimé Auteurs : Li Wang, Auteur ; Qian Shu, Auteur ; Zhang Yu, Auteur ; Chen Shujuan, Auteur ; Zhang Xinshen, Auteur Année de publication : 2012 Article en page(s) : p. 148-151 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse Extraction par solvant Fumarate de diméthyle Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Purge-assisted headspace solid-phase micro-extraction (PA/HS-SPME) was proposed for the determination of dimethyl fumarate (DMF) extracted from finished leather. Samples were extracted from solvent by Accelerated Solvent Extractor (ASE), concentrated and purified with PA/HS-SPME, analyzed by gas chromatography-mass-spectrometry (GC-MS), and quantified against external standards. The parameters of PA/HS-SPME, such as temperature and time, were studied. Under the optimal conditions, the linearity for DMF was over the concentration range of 5-1000ng/ml ; the detection limit was 1ng/ml ; the relative standard deviation (n=6) was 9.94 % at 100ng/ml. The recoveries were in the range of 66.8-91.5 %. This eco-friendly method was applied to the determination of DMF in leather samples satisfactorily. The proposed PA/HS-SPME method opens new avenues for the determination of DMF in leather samples. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Instrumentation - Extraction of DMF from leather samples and sample preparation - Operating procedure - RESULTS AND DISCUSSION : Optimization of PA/HS-SPME conditions - Limits of detection, linear range and precision - Analysis or real samples En ligne : https://drive.google.com/file/d/1eaoKLIvuJdArwL4gDuSV_XOerDlgYUIA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15699 [article]

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Flow injection spectrophotometric determination of chromium(VI) extracted from dyed leather with on-line decolouring / Li Wang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 4 (07-08/2012)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 96, N° 4 (07-08/2012) . - p. 152-156 Titre : Flow injection spectrophotometric determination of chromium(VI) extracted from dyed leather with on-line decolouring Type de document : texte imprimé Auteurs : Li Wang, Auteur ; Zhang Xinshen, Auteur ; Qian Shu, Auteur ; Zhang Yu, Auteur ; Chen Shujuan, Auteur Année de publication : 2012 Article en page(s) : p. 152-156 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir -- Teneur en chrome hexavalent Cuir teint Cuirs et peaux -- Analyse Spectrophotométrie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The on-line decolouring reverse reference flow injection analysis (r-FIA) was proposed to determine chromium(VI) extracted from dyed leather by phosphate buffer. A decolouring column and time switch controller was introduced in r-FIA. Under the optimal conditions, the linear range of this method was 2-50µg/l ; the detection limit was 0.94µg/l ; the relative standard deviation (n=11) for 20µg/l chromium(VI) was 0.88 %. Using a dyed leather sample, the corresponding linear range of this method was 0.5-12.5mg/kg. The method not only effectively removes the colour interference but also is also rapid, reliable, saves time and effort and is convenient. This method was suitable for automatic and continuous analysis with satisfactory result. The method represents 'green' analytical chemistry for Cr(VI) in dyed leather samples. Note de contenu : - EXPERIMENTAL PROCEDURES : Reagents - Preparation of solutions - Instrumentation - Analytical procedure - The work conditions of on-line decolouring reverse reference flow injection analysis (r-FIA) - Decolouration by DJ, PA and Florisil column - Extraction of Cr(VI) from leather samples and sample preparation En ligne : https://drive.google.com/file/d/19jTpke5i8cKyMcKf9e9mxHrm6lzrkZSf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15700 [article]

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Synthesis and characterization of cathodic electrodeposition coatings based on octadecyl-modified cationic waterborne polyurethanes / Xiaoling He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 5 (09/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 5 (09/2020) . - p. 1255–1268 Titre : Synthesis and characterization of cathodic electrodeposition coatings based on octadecyl-modified cationic waterborne polyurethanes Type de document : texte imprimé Auteurs : Xiaoling He, Auteur ; Zhang Yu, Auteur ; Jingwei He, Auteur ; Fang Liu, Auteur Année de publication : 2020 Article en page(s) : p. 1255–1268 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Chaînes latérales octadécyl Dépôt électrolytique Hydrophobie Polymères -- Synthèse Polymères cationiques Polymères en émulsion Polyuréthanes Revêtements en phase aqueuse Revêtements organiques Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : Aimed at increasing the hydrophobicity of cathodic electrodeposition (CED) coatings based on cationic waterborne polyurethanes (WPUs), a series of cationic WPUs with hydrophobic octadecyl side chains were successfully synthesized by introducing 1-monostearoyl-rac-glycerol as a diol chain extender. ATR-FTIR spectra and SEM images showed the degree of phase separation between soft segments and hard segments of cationic WPUs clearly increased by incorporating octadecyl groups. The water contact angle and water absorption studies showed that the water-resistance property of modified CED coatings was obviously enhanced because of the incorporation of a low surface energy unit and the formation of a more sophisticated surface induced by hydrogen bonds. The International Standardization test of paints and varnishes revealed that the CED films possessed excellent hardness, adhesion, flexibility, and impact resistance. Optical transmittance tests showed that the sample films possessed excellent optical transmittance of about 90%, and meanwhile, the thermostability of the film was promoted. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of cationic WPUs with octadecyl alkyl side chains - Preparation of cationic WPUs with octadecyl alkyl side chain films - Characterization - RESULTS AND DISCUSSION : Synthesis and characterization of cationic WPUs with octadecyl alkyl side chains - Emulsion property of cationic WPUs with octadecyl alkyl side chains - Properties of CED coatings based on cationic WPUs with octadecyl alkyl side chains - Optical transmittance of CED coatings based on cationic WPUs with octadecyl alkyl side chains - Surface morphology of CED coatings based on cationic WPUs with octadecyl alkyl side chains - Thermal stability of CED coatings based on cationic WPUs with octadecyl alkyl side chains - Water resistance of CED coatings based on cationic WPUs with octadecyl alkyl side chains DOI : https://doi.org/10.1007/s11998-020-00344-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00344-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34571 [article]

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Synthesis and surface properties of novel gemini surfactants / Zhang Zhang in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 5 (09-10/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 5 (09-10/2012) . - p. 413-416 Titre : Synthesis and surface properties of novel gemini surfactants Type de document : texte imprimé Auteurs : Zhang Zhang, Auteur ; Zhang Zhen-Xian, Auteur ; Liu Yu-rong, Auteur ; Zhang Yu, Auteur ; Chen Jie, Auteur Année de publication : 2012 Article en page(s) : p. 413-416 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tension superficielle Tags : 'Surfactant  gemini'  cationique'  dimérique'  'Tension  interfaciale' Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Novel Gemini surfactants containing amide group linkage were prepared with fatty acid, diamine and dihalide by simple organic reaction, and characterized with IR, and elemental analysis (EA). As the results show, the structures of the products obtained correspond to the target compounds designed. By surface tension scanning, these Gemini surfactants have excellent surface activity with low c.m.c. and surface tension, the lowest c.m.c value was 9.12 × 10–6 mol/L for surfactant Bi-18(4). DOI : 10.3139/113.110211 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15878 [article]

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