Effect mechanism of acidification and vulcanization on SBS-modified asphalt / Feng Zhang in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 5 (2022)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 5 (2022) . - p. 559-567 Titre : Effect mechanism of acidification and vulcanization on SBS-modified asphalt Type de document : texte imprimé Auteurs : Feng Zhang, Auteur ; Lei Li, Auteur Année de publication : 2022 Article en page(s) : p. 559-567 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Asphalte Caractérisation Chromatographie sur gel Copolymère styrène butadiène styrène Matériaux -- Propriétés physiques Matériaux bitumineux Morphologie (matériaux) Polyphosphorique, Acide Rhéologie Soufre Vieillissement Index. décimale : 668.4 Plastiques, vinyles Résumé : A styrene-butadiene-styrene (SBS) modified asphalt compound was prepared by the addition of polyphosphoric acid (PPA) and sulfur. The effect of PPA and sulfur on major physical properties, including toughness and tenacity, aging resistance, and storage stability was investigated. The structural characteristics of SBS-modified (SM) asphalt, SBS/PPA-modified (SPM) asphalt, and SBS/PPA/sulfur-modified (SPSM) asphalt were investigated using scanning electron microscopy (SEM), gel filtration chromatography (GPC), and thermal analysis. It has been found that acidification prompted the clustering of SBS particles and confined the swelling of SBS, making SPM asphalt more susceptible to aging. Vulcanization changed the morphological characteristics of SBS in asphalt, improved the compatibility between SBS and asphalt, and weakened the aging susceptibility. Therefore, it is reasonable to modify SM asphalt by using PPA and sulfur together. Note de contenu : - MATERIALS AND METHODS : Materials - Sample preparation - Morphological characterization - Physical properties - Aging of asphalt - Rheological properties - GPC - Thermal analysis - RESULTS AND DISCUSSION : Morphology - Physical properties - Rheological properties - GPC analysis - The experimental curve of a sam - Thermal analysis - Table 1 : Physical properties of base asphalt - Table 2 : Pore size and effective molecular weight range - Table 3 : Physical properties of SM, SPM, SPSM asphalts - Table 4 : Mn, Mw, Pd of SM, SPM, SPSM asphalts DOI : https://doi.org/10.1515/ipp-2022-4233 En ligne : https://drive.google.com/file/d/1QUvhoIlOPwABi5t62ihU1YUuOzT-PmB-/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38330 [article]

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Simultaneous determination of N-methyl-2-pyrrolidone (NMP) and N-ethyl-2-pyrrolidone (NEP) in leather by gas chromatography-mass spectrometry / Sang Jun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 3 (05-06/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 3 (05-06/2015) . - p. 134-138 Titre : Simultaneous determination of N-methyl-2-pyrrolidone (NMP) and N-ethyl-2-pyrrolidone (NEP) in leather by gas chromatography-mass spectrometry Type de document : texte imprimé Auteurs : Sang Jun, Auteur ; Yu Lingyun, Auteur ; Shudong Xie, Auteur ; Feng Zhang, Auteur ; Zhang Xiaolei, Auteur ; Wei Lin, Auteur Année de publication : 2015 Article en page(s) : p. 134-138 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie en phase gazeuse Cuir -- Teneur en solvants Cuirs et peaux -- Analyse Extraction (chimie) N‐éthyl‐2‐pyrrolidone N-méthyl-2-pyrrolidone Le N-méthyl-2-pyrrolidone ou 1-méthyl-2-pyrrolidone, généralement abrégé en NMP, est un liquide incolore ou jaune clair. C'est un amide cyclique (lactame) souvent utilisé en tant que solvant organique.C'est un solvant hygroscopique, miscible avec l'eau et la plupart des solvants organiques. C'est une base faible: une solution aqueuse contenant 10% de NMP a un pH de 7,7-86. Utilisation : Ce composé est principalement utilisé comme solvant à cause de ses propriétés physiques: faible volatilité, stabilité thermique, solvant polaire et aprotique. Ses propriétés toxicologiques en font un bon candidat pour le remplacement de solvants chlorés. Les domaine d'utilisation sont vastes : en pétrochimie, il sert de solvant d'extraction pour les composés aromatiques et le butadiène ou de purification des gaz (récupération du dioxyde de carbone et du sulfure d'hydrogène); en électronique, il sert de solvant de nettoyage pour les wafers de silicium; en chimie, il est utilisé comme solvant de réaction ou de formulation ; comme agent de nettoyage dans l'industrie des métaux (dégraissage). Spectrométrie de masse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : N-Alkyl-2-pyrrolidones such as N-methyl- and N-ethyl-2-pyrrolidone (NMP and NEP) are widely used as solvents in leather finishing agents. However, NMP and NEP were identified as reproductive toxicants. Moreover, NMP has been listed in the Candidate List of Substances of Very High Concern (SVHC) by European Chemicals Agency. Herein, we have developed a simple and rapid gas chromatography-mass spectrometry method for the simultaneous determination of NMP and NEP in leather samples. The extraction solvent, methods and time have bean comparatively investigated and optimized for enhancing the extraction efficiency of NMP and NEP in samples. Under optimal extraction and GC-MS conditions, the linear range of both NMP and NEP were between 0.5 and 100mg L-1 with regression coefficients (R2) of 0.999. The Relative standard deviation (R.S.D.) for ten replications of analysis was 2.6% and 2.8% for NMP and NEP, respectively. And limit of detection (LOD) for NMP and NEP were bath 0.1mg/kg. In leather samples the mean recoveries were 94.8%-105.6% and 98.5%-105.2% for NMP and NEP, respectively. The proposed method has been proved to be applicable for the simultaneous determination of the target NMP and NEP in leather samples. Note de contenu : - EXPERIMENTAL PROCEDURE : Apparatus - Chemicals and reagents - GC-MS conditions - Extraction - Quantification - RESULTS AND DISCUSSION : Extraction solvent selection - Extraction method and extraction time - Specificity - Linearity and detection limit - Recoveries and precision - Application En ligne : https://drive.google.com/file/d/1n6lixOlOvHknZmlCsXZ0TDaZUMP7aqib/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24258 [article]

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Synthesis of an amino-terminated hyperbranched polymer and its application in reactive dyeing on cotton as a salt-free dyeing auxiliary / Feng Zhang in COLORATION TECHNOLOGY, Vol. 123, N° 6 (2007)  

[article]  inCOLORATION TECHNOLOGY > Vol. 123, N° 6 (2007) . - p. 351-357 Titre : Synthesis of an amino-terminated hyperbranched polymer and its application in reactive dyeing on cotton as a salt-free dyeing auxiliary Type de document : texte imprimé Auteurs : Feng Zhang, Auteur ; Yuyue Chen, Auteur ; Hong Lin, Auteur ; Yanhua Lu, Auteur Année de publication : 2008 Article en page(s) : p. 351-357 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : A water-soluble amino-terminated hyperbranched polymer was synthesised from methyl acrylate and diethylene triamine by melt polycondensation. Its molecular weight and possible structure were characterised by gel permeation chromatography, Fourier transform infrared spectrophotometry and nuclear magnetic resonance spectroscopy. The zeta potential of cotton fabrics treated with the aqueous solution of the amino-terminated hyperbranched polymer (6 g dm-3) in the presence of citric acid (2 g dm-3) and sodium hypophosphite (3 g dm-3) of the liquid phase is positive at pHs lower than 7.5. Dyed with reactive dyes, the treated cotton fabric displayed a markedly enhanced colour strength, even when dyeing had been carried out in the absence of the electrolyte. The washing fastness, rubbing fastness and levelling properties of the dyed, treated cotton fabrics were also good compared with that obtained by conventional dyeing. The dyeing behaviour of Reactive Brilliant Yellow A-4GLN on treated cotton fabric was examined and found to follow a Langmuir-type adsorption curve. It is concluded that the amino-terminated hyperbranched polymer can be used as a salt-free auxiliary in reactive dyeing on cotton. DOI : 10.1111/j.1478-4408.2007.00108.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2007.00108.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6854 [article]

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