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The preparation and application of a nanocomposite tanning agent-MPNS-SMA / Hui Pan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 4 (07-08/2005)
[article]
Titre : The preparation and application of a nanocomposite tanning agent-MPNS-SMA Type de document : texte imprimé Auteurs : Hui Pan, Auteur ; Zhijun Zhang, Auteur ; Juxian Zhang, Auteur ; Hongxin Dang, Auteur Année de publication : 2005 Article en page(s) : p. 153-156 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage
Caractérisation
Copolymère styrène acide maléique
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux de moutons
Dioxyde de silicium
Matériaux hybrides
Méthacryloxypropyltriméthoxysilane
Nanoparticules
Peroxyde de benzoyle
Réaction de couplage
Retannage
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : r-Methacryloxy propyltrimethoxysilane (MPTMS) was used as a coupling agent to introduce vinyl groups onto the surface of nano SiO2. A nanocomposite of MPNS/SMA was prepared by the polymerization of methacryloxypropyl nano SiO2 (MPNS), styrene (ST) and maleic anhydride (MA) with benzoyl peroxide (BPO)as initiator in toluene. The structure of the MPNS/SMA nanocomposite was characterized by FT-IR (Fourier Transform Infrared Spectroscopy) and TEM (Transmission Electron Microscope).
A series of tanning experiments have been carried out to compare the tanning and retanning properties of MPNS/SMA and styrene-maleic anhydride copolymer (SMA). The results show that MPNS/SMA has good tanning capability, and that leather treated with the MPNS/SMA nanocomposite is of good quality.Note de contenu : - EXPERIMENTAL PROCEDURES : Chemicals and instrumentation - Preparation of MPNS/SMA nanocomposite
- TANNING WITH MPNS/SMA NANOCOMPOSITE AND SMA COPOLYMER : General procedure for tanning - Retanning with MPNS/SMA, SMA and chrome tanning agent - Comparison application experiment with MPNS/SMA nanocomposite
- RESULTS AND DISCUSSION : The analysis of MPNS/SMA and MPNS by FT-IR and TEM - Results of application comparison experiments
- Table 1 : Retanning process of blue sheep leather treated with MPNS/SMA, SMA and chrome powder
- Table 2 : Results of tanning with MPNS/SMA and SMA
- Table 3 : Results of physical-mechanical testing of retanned leathers - 3 types of retannage (1% offer)
- Table 4 : Results of physical-mechanical testing of retanned leathers - 3 types of retannageEn ligne : https://drive.google.com/file/d/12oiH2T8TpaGXv-Avk7IChXfn_-s8soG_/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39250
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 4 (07-08/2005) . - p. 153-156[article]The preparation of hydrophobic hybrid film coatings from siloxane-modified polyacrylate associated with nano-fumed silica and organo-modified clay / Weepol Pramualkijja in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)
[article]
Titre : The preparation of hydrophobic hybrid film coatings from siloxane-modified polyacrylate associated with nano-fumed silica and organo-modified clay Type de document : texte imprimé Auteurs : Weepol Pramualkijja, Auteur ; Nantana Jiratumnukul, Auteur Année de publication : 2022 Article en page(s) : p. 1467-1492 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Angle de contact
Angle de glissement
Argile
Caractérisation
Dispersions et suspensions
Hydrophobie
Matériaux hybrides
Morphologie (matériaux)
Polyacrylates
Polymères modifiés siloxane
Revêtements organiques
Rugosité
Structure chimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Superhydrophobic hybrid film coatings were prepared from the dispersions of siloxane-modified polyacrylate associated with organo-modified clay (OMC-20A) and hydrophobic-fumed silica (FS-H15) coated on glass and cement boards by a dipping process. The hydrophobicity, surface morphology, surface energy, and surface roughness of the obtained hybrid film coatings (HBFCs) were investigated. The results showed that the hydrophobicity of the obtained HBFCs was related to surface roughness and the roughness profile of the surface. HBFCs obtained using 10 phr OMC-20A with 35 phr FS-H15 in hybrid coatings and fabricated by four dipping provided high roughness surfaces (Rq) at 546.67 nm with a micro-nano-binary structure and a low surface energy at 2.35 mN/m leading to superhydrophobic surfaces on the coated glass and cement boards demonstrating 151.34° and 150.88° water contact angles, respectively. As a result, these HBFCs coated on cement board performed great water repellent and self-cleaning. Note de contenu : - Experimental : Materials
- Preparation of SMPA
- Preparation of the HCs
- Fabrication of the HBFCs
- Characterization
- Results and discussion : SMPA dispersions - Hydrophobicity related with adhesion and hardness - Surface morphology - The chemical structure of HBFCs - Surface energy - Surface roughness and profile of roughness
- Effect of porous substrates : The water contact angle, water repellent and self-cleaning - The durability
- Table 1 : Recipes of the different HC1s
- Table 2 : Recipes of the different HC2s
- Table 3 : Adhesion of the HBFCs
- Table 4 : The sliding angle of HBFC1 and 2s
- Table 5 : The water, EG and glycerol contact angles of the different HCsDOI : https://doi.org/10.1007/s11998-022-00621-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00621-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38284
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Code-barres Cote Support Localisation Section Disponibilité 23672 - Périodique Bibliothèque principale Documentaires Disponible The role of nanoclay partitioning and fibril formation on dyeability of blend nanocomposite fibres / Ahmad Bigdeli in COLORATION TECHNOLOGY, Vol. 129, N° 4 (08/2013)
[article]
Titre : The role of nanoclay partitioning and fibril formation on dyeability of blend nanocomposite fibres Type de document : texte imprimé Auteurs : Ahmad Bigdeli, Auteur ; Hossein Nazockdast, Auteur ; Abosaeed Rashidi, Auteur ; Mohammad Esmail Yazdanshenas, Auteur Année de publication : 2013 Article en page(s) : p. 289–297 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile
Composites
Compoundage
Extrudeuse bi-vis
Extrusion filage
Fibrillation
Matériaux hybrides
Microscopie électronique à balayage
Microscopie électronique en transmission
Nanoparticules
Polybutylène téréphtalate
Polypropylène
Rhéologie
Teinture -- Fibres textiles synthétiquesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The aim of the present work was to study the effect of microstructure and microfibril formation on dyeability of polypropylene/poly(butylene terephthalate)/organoclay blend nanocomposite fibres. The blend nanocomposite samples with the same blend ratio but varying in organoclay content were prepared via melt compounding by using a co-rotating twin screw extruder. The microfibrillar morphology and nanoclay partitioning were studied using scanning electron microscopy and transmission electron microscopy together with rheological results. The presence of nanoclay in the form of tactoids in the polypropylene matrix accelerated the dye sorption but much greater ultimate dye uptake could be achieved for the sample in which the major part of the platelets were preferentially located inside the poly(butylene terephthalate) fibrils. Although increasing the organoclay concentration increased the ultimate dye uptake, it limited the fibril formation at higher organoclay concentration. The utilisation of a compatibiliser was found to have an enhancing effect on ultimate dye uptake. This could be explained in terms of the interfacial role of the compatibiliser in improving microfibril formation as well as partitioning a fraction of nanoclay platelets inside the polypropylene matrix. DOI : 10.1111/cote.12038 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12038/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19042
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Code-barres Cote Support Localisation Section Disponibilité 15394 - Périodique Bibliothèque principale Documentaires Disponible The role of organic modification of layered nanosilicates on mechanical and surface properties of organic–inorganic coatings / Milena SpÃrková in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 3 (05/2011)
[article]
Titre : The role of organic modification of layered nanosilicates on mechanical and surface properties of organic–inorganic coatings Type de document : texte imprimé Auteurs : Milena SpÃrková, Auteur ; Petr Duchek, Auteur ; Adam Strachota, Auteur ; Rafal Poreba, Auteur ; Jirà Kotek, Auteur ; Josef Baldrian, Auteur ; Miroslav Slouf, Auteur Année de publication : 2011 Article en page(s) : p. 311-328 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bentonite La bentonite est une argile colloïdale dont le nom vient de Fort Benton dans le Wyoming aux États-Unis. Connue aussi sous le terme de terre à foulon, elle peut être considérée comme une smectite, étant essentiellement constituée de montmorillonite (Na,Ca)0.33(Al,Mg)2Si4O10(OH)2·(H2O)n.(80 %) et d'argile ce qui explique sa capacité de rétention d'eau. On trouve également d'autres minéraux comme le quartz, le mica, le feldspath, la pyrite ou la calcite. Les gisements de bentonites sont d'origines volcanique et hydrothermale.
Elle possède diverses propriétés. Notamment, elle absorbe les protéines, réduit l’activité des enzymes. Les boues bentonitiques (recelant une fraction de bentonite) sont utilisées dans les travaux de terrassement, de parois moulées, du fait de leur capacité à laisser la place rapidement et facilement aux bétons coulés à leur place. Elles peuvent être ajoutées au compost.
Le numéro CAS de la bentonite est 1302-78-9.
Il existe deux types de bentonites :
La bentonite à base de sodium, qui augmente de volume lorsqu'elle est humide et qui peut absorber plusieurs fois sa masse en eau. Cette propriété est mise en valeur dans les mastics pour l'enfouissement de matières polluantes dans le sol. Elle est utilisée dans les puits de forage de pétrole et la recherche géothermique.
La bentonite à base de calcium (pascalite), qui ne possède pas ces propriétés de gonflement, a des applications parapharmaceutiques dont les résultats restent à prouver, notamment dans le domaine du système digestif. Des tribus indigènes d'Amérique du Sud, d'Afrique et d'Australie ont longtemps employé l'argile de bentonite pour cet usage.
En raison de ses fonctionnalités rhéologiques, la bentonite a un comportement thixotrope. Des petites quantités de bentonite en solution aqueuse forment un mélange visqueux, dont la viscosité baisse lorsque l'effort mécanique qui lui est appliqué augmente.
Composés inorganiques
Composés organiques
Matériaux hybrides
Montmorillonite
Revêtements
Sol-gel, ProcédéIndex. décimale : 667.9 Revêtements et enduits Résumé : The effect of alcohol- and amino-functional compatibilizers in nanocomposites of organic–inorganic (O–I) matrices with layered nanofillers (LN) was studied. The alcohol-functional compatibilizers are shown to have a marked influence on morphology, surface- and mechanical properties of the coatings prepared, in spite of the very small amount of both filler and compatibilizer (together 0.5 wt%). The studied O–I matrices were polyepoxy-functional polysiloxanes cured with organic diamines. Two commercial clays were used as LN in the concentration of 0.5 wt%: natural montmorillonite (Cloisite Na, abbreviated MNa) and Bentonite for water systems (BW). These clays were compatibilized by three hydroxyl-containing substances: Polyethylene glycol 4000, TWEEN 80, and tris(hydroxymethyl)aminomethane (TRIS). All compatibilizers improve the dispersion of the clay fillers, while TRIS always supports full exfoliation. They also cause an increase in the microroughness of the coatings and strongly modify their large-scale surface patterns. Mechanical properties are also strongly affected by the compatibilizers: toughness is increased, sometimes markedly, as well as stress at break. Tensile and shear moduli are reduced by the compatibilizers, while the glass transition temperature is specifically shifted to higher or lower values, sometimes markedly. Note de contenu : - EXPERIMENTAL : Chemicals - Modification of layered silicates - Synthesis of coatings - Methods of characterization.
- RESULTS AND DISCUSSION : The hybrid organic-inorganic matrices
- The clay nanofillers tested - The compatibilizers - Morphology : WAXS study of intercalation/exfoliation - Transmission electron microscopy - Surface morphology - Tensile behavior - Dynamic mechanical thermal analysis.DOI : 10.1007/s11998-010-9315-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9315-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11672
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Code-barres Cote Support Localisation Section Disponibilité 012971 - Périodique Bibliothèque principale Documentaires Disponible The role of organoclay on in-situ microfibril formation of epoxy in poly(butylene terephtalate) nanocomposites / M. M. Salehi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)
[article]
Titre : The role of organoclay on in-situ microfibril formation of epoxy in poly(butylene terephtalate) nanocomposites Type de document : texte imprimé Auteurs : M. M. Salehi ; Hossein Nazockdast ; G. R. Pircheraghi Année de publication : 2013 Article en page(s) : p. 199-206 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile
Epoxydes
Extrusion filage
Fibrillation
Matériaux hybrides
Matières plastiques -- Extrusion:Polymères -- Extrusion
Polybutylène téréphtalateIndex. décimale : 668.9 Polymères Résumé : The main objective of the present work was to study the role of organoclay on the microfibrillation process of epoxy phase in Poly(butylene terephtalate), PBT, matrix both in presence and absence of epoxy curing agent. The PBT/epoxy blend samples with constant blend ratio (60/40) were prepared by melt mixing in a twin screw extruder. The elongational flow imposed by drawing the extrudate at the die exit permitted controlled generation of fibrile morphology of the dispersed epoxy phase, with a fiber diameter of 0.8 lm and an aspect ratio greater than 100. It was shown that when the curing agent was added into the extruder, its reactivity with epoxy at high temperature was high enough and selectively affected on the epoxy phase. The SEM results showed smaller epoxy droplet size for samples containing nanoclay compared to simple blends. This could be explained in terms of hindrance effect of nanoclay in reducing the coalescence as a dominating parameter due to presence of nanoclay in both phases. These results were supported by the melt linear viscoelastic results which showed enhanced low frequency viscosity and storage modulus for these samples. Addition of nanoclay was found to have little effect on extent of fibrillation epoxy droplet in stretched samples. The rheological results obtained for stretched samples showed very strong increase in low frequency solid body response whose extent was increase with increasing draw ratio. This mainly attributed to special 3-D network formed between microfibrils whose shape was stabilized by either presence of nanoclay or accelerated curing process of fibrillated epoxy. From SEM micrographs and linear viscoelastic measurements it can be deduced that curing process has small changes on the extent of fibrillation epoxy droplet in stretched samples. But it leads to improvement of interfacial interaction between two phases in the nanocomposites. Note de contenu : - EXPERIMENTAL/MODELING/SIMULATION : Materials - Sample preparation - Sample characterization
- RESULTS AND DISCUSSION : Residence time distribution in extruder and kinetics of epoxy curing - PBT/epoxy blendsDOI : 10.3139/217.2681 En ligne : https://drive.google.com/file/d/1LutPvUwI20tFsaMar7vQOg7LG7x8AM5O/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18433
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