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Preparation and application of a novel cationic fatliquoring agent / Yang Hong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 1 (01-02/2019)
[article]
Titre : Preparation and application of a novel cationic fatliquoring agent Type de document : texte imprimé Auteurs : Yang Hong, Auteur ; Jin Liqiang, Auteur ; Yulu Wang, Auteur ; Jinlong Wang, Auteur Année de publication : 2019 Article en page(s) : p. 35-42 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse sensorielle
Caractérisation
Colorants -- Absorption
Colorimétrie
Composés organiques -- Synthèse
Cuirs et peaux -- Propriétés mécaniques
Douceur (toucher)
Emulsifiants
Formulation (Génie chimique)
Produits de nourriture du cuir
Solidité de la couleur
Solutions aqueuses (chimie)
Tension superficielle
TomographieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this work, a novel cationic fatliquoring agent YI-1 was prepared by two steps. Firstly, a cationic emulsifier YW based on fatty acid triethanolamine ester was synthesized by using stearic acid, triethanolamine and benzyl chloride. Then, YH was obtained by mixing a certain amount of YW, non-ionic surfactant and neutral oil. The composition of YH was optimized by its application behaviour as a fatliquor. The structure of YW was characterised by infrared spectroscopy and H-NMR. The surface tension of YW aqueous solution was determined by using a surface tension meter. The stability, particle size and zeta potential of YH were studied. The results show that YH exhibits high centrifugal stability and electrolyte resistance with an average particle size of 24.44nm and zeta potential of 60.8mV at pl-14.5. The leather samples treated by YH show high softness, tensile strength and tear strength. When YH was used as a dye-fixing agent, it could promote the absorption and fixation of anionic dyestuff, and improve the dry/wet fastness of leather and the colour fastness of washing. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation process of cationic fatliquoring agent YH - Characterisation - Application formulations - Determination of leather properties
- RESULTS AND DISCUSSIONS : Synthesis of cationic emulsfifier YW - Surface tension of YW aqueous solution - Optimisation of preparation conditions of YH - Physical and chemical indices of YH - The applications results of YHEn ligne : https://drive.google.com/file/d/18uP_e5DEwIYcUA-K0qEPllcLkGtAFSTp/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31791
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 1 (01-02/2019) . - p. 35-42[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20620 - Périodique Bibliothèque principale Documentaires Disponible Preparation and characterization of CaCO3/high density polyethylene composites with various shapes and size of CaCO3 / X. Shi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)
[article]
Titre : Preparation and characterization of CaCO3/high density polyethylene composites with various shapes and size of CaCO3 Type de document : texte imprimé Auteurs : X. Shi ; J. Wang ; X. Cai Année de publication : 2013 Article en page(s) : p. 228-235 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Caractérisation
Carbonate de calciumLe carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole.
C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots.
Chlorure de calcium
Cristallisation
Particules (matières)
Polyéthylène haute densité
Polymères -- Propriétés mécaniques
Rhéomètres
Solutions aqueuses (chimie)
Stabilité thermiqueIndex. décimale : 668.9 Polymères Résumé : Calcium carbonate (CaCO3) with various shapes and size was prepared using CaCl2 and Na2CO3 aqueous solutions containing various additives. High density polyethylene (HDPE)/4 wt% CaCO3 composites were prepared using a Haake Rotational Rheometer. The effects of the CaCO3 particle shapes and size on the thermal and mechanical properties were investigated and characterized by differential scanning calorimetry (DSC) and universal testing machine. The results show the addition of CaCO3 to HDPE can increase the crystallization and decrease the melting temperature and crystallization temperature. The tensile yield strength of the composites was higher than that of HDPE. Sphere-like CaCO3 is the best form in improving the thermal stability and cubic CaCO3 can cause negative effect to the toughness. The impact strength of the composites is significantly increased with decreasing CaCO3 particle size. SEM examination of the fractured surfaces of the composites shows that CaCO3 reacted in cavitations and "lance" functions which increase the impact strength of the HDPE/CaCO3 composites. Note de contenu : - EXPERIMENTAL : Materials - Preparation and surface modification of CaCO3 particles - Preparation of HDPE/CaCO3 composites - Characterization
- RESULTS AND DISCUSSION : Shapes of CaCO3 - Thermal behavior of the HDPE and HDPE/CaCO3 composites - Crystalline morphologies of HDPE and HDPE/CaCO3 composites - Mechanical properties of HDPE and HDPE/CaCO3 composites - Morphology of fractured surfacesDOI : 10.3139/217.2695 En ligne : https://drive.google.com/file/d/1iO--Vadhfxhq7w4gkG-ONN4_bAkdmxU5/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18436
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 2 (05/2013) . - p. 228-235[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15050 - Périodique Bibliothèque principale Documentaires Disponible Processing of polymer nanocomposites reinforced with cellulose nanocrystals : a challenge / Alain Dufresne in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 5 (11/2012)
[article]
Titre : Processing of polymer nanocomposites reinforced with cellulose nanocrystals : a challenge Type de document : texte imprimé Auteurs : Alain Dufresne, Auteur Année de publication : 2012 Article en page(s) : p. 557-564 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomatériaux
CelluloseLa cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules.
Composites
Cristaux
Dispersions et suspensions
Hydrolyse
Matériaux hybrides
Nanoparticules
Ressources renouvelables
Solutions aqueuses (chimie)Index. décimale : 668.4 Plastiques, vinyles Résumé : Aqueous suspensions of cellulose nanocrystals can be prepared by acid hydrolysis of the biomass. Due to their nanoscale dimensions and intrinsic physicochemical properties, these nanoparticles are promising renewable biomaterials. The high mechanical properties and reinforcing capability of these nanoparticles make them attractive for the processing of high performance nanocomposites. The main problem is related to the homogeneous dispersion of these nanoparticles within the polymeric matrix. Because cellulose nanocrystals are obtained as aqueous suspensions, water is the preferred processing medium. However, new strategies are envisaged to broaden the polymeric matrices that can be reinforced with these nanoparticles and avoid the liquid medium processing way. This paper reviews the different processing techniques of cellulose nanocrystals reinforced polymer nanocomposites focusing on the challenging melt processing technique. Note de contenu : - Polymer latexes
- Water soluble or water dispersible polymers
- Non aqueous systems
- Melt compoundingDOI : 10.3139/217.2603 En ligne : https://drive.google.com/file/d/1XNgSK26UJVWDkTDMpKF8Ps7ENv7x5q2T/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16638
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 5 (11/2012) . - p. 557-564[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14335 - Périodique Bibliothèque principale Documentaires Disponible Protection du cuir à l'eau et aux salissures par traitement en milieu aqueux / A. Balas in TECHNICUIR, N° 10 (12/1973)
[article]
Titre : Protection du cuir à l'eau et aux salissures par traitement en milieu aqueux Type de document : texte imprimé Auteurs : A. Balas, Auteur Année de publication : 1973 Article en page(s) : p. 194-196 Langues : Français (fre) Catégories : Cuir
Imperméabilisation
Résistance à l'humidité:Résistance à l'eau
Résistance à la salissure
Solutions aqueuses (chimie)Index. décimale : 675 Technologie du cuir et de la fourrure Note de contenu : 1. Phase : objectifs d'usage
2. Phase : présélection du procédé d'imperméabilisation
3. Phase : choix du procédé humide
- 1er critère : la nature du produit
- 2e critère : le mode d'application à 1 ou 2 composants
- 3e critère : la nature ionique du système
- 4e critère : la sensibilité sur le cuir traité
- CLASSIFICATION DES SYSTEMES IMPERMEABILISANTS : Les émulsions de cire - Les émulsions de paraffine - Les résines synthétiques polymérisables - Les systèmes mettant en oeuvre des sels métalliques - Les émulsions de paraffine - Les huiles dites synthétiques émulsionnées - Les acides organiques à longue chaîne - Les systèmes de type émulsifiant eau dans l'huile - Les stéaratochlorures de chrome
- Les résines fluorées en émulsion
- Les silicones en émulsionEn ligne : https://drive.google.com/file/d/1MqxwgBunKlGArjqJUsPjSftz5_w8-oUW/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22782
in TECHNICUIR > N° 10 (12/1973) . - p. 194-196[article]Exemplaires (2)
Code-barres Cote Support Localisation Section Disponibilité 009078 - Périodique Bibliothèque principale Documentaires Exclu du prêt 009073 - Périodique Bibliothèque principale Documentaires Exclu du prêt Radical mechanism of azo cleavage for monoazo reactive dyes, a QSPR study : the similarity between photoreduction on polyamide substrates and thermal reduction in aqueous dithionite solutions / Yasuyo Okada in COLORATION TECHNOLOGY, Vol. 132, N° 4 (08/2016)
[article]
Titre : Radical mechanism of azo cleavage for monoazo reactive dyes, a QSPR study : the similarity between photoreduction on polyamide substrates and thermal reduction in aqueous dithionite solutions Type de document : texte imprimé Auteurs : Yasuyo Okada, Auteur ; Toshio Hihara, Auteur ; Zenzo Morita, Auteur Année de publication : 2016 Article en page(s) : p. 327-343 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants azoïques
Colorants réactifs
Dithionite de sodium
Polyamide 6
Réduction (chimie)
Solutions aqueuses (chimie)
ThermochimieIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The same radical mechanism occurs in reductive azo cleavage via monohydrogenated radicals generated as the starting reactants in photo- and thermal (by dithionite) reduction on a nylon 6 substrate and in aqueous and alcoholic solutions. The rates of photo- and thermal azo cleavage in the solid and liquid phases have been thermochemically analysed by calculating the heats of formation of the reactants, intermediates, and products for (1) intramolecular hydrogen transfer (self-decomposition via rearrangement) in the photo- and radically induced hydrazinyl radicals as well as for (2) the disproportionation (redox reaction) between the radicals via a molecular orbital method. The rates of reductive fading (or azo cleavage) are controlled by the heats of reaction via reaction pathways (1) and (2) as well as by rearrangement, depending on the reaction system. Photoreduction of these dyes on polyamide generated the same end products – diazo components and iminooxoquinones from the coupling component – as the products of thermal reduction in aqueous sodium dithionite and of photoreduction in the liquid phase. Photofading on polyamide substrates owing to continuous irradiation is controlled by three factors: the quantum yield of photoinduced hydrazinyl radicals, its rearrangement processes, and the heats of reaction for the thermal azo cleavage reactions via the two pathways. These factors may become molecular descriptors that correlate the rates of fading with molecular structures. The present study may become an introductory trial to construct quantitative structure–property relationship modelling for reduction-fast azo dyes. Note de contenu : - EXPERIMENTAL : Dyes used - Parameters used for the analysis - Materials : dyeing and exposure
- RESULTS AND DISCUSSION : Formation of the (MHN) moiety - Thermochemical analysis for the rates of thermal reduction of food azo dyes - Rates of photoreduction for model azo dyes in an alcoholic aqueous solution - Photoreduction of reactive azo dyes on PA substratesDOI : 10.1111/cote.12223 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12223 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26735
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