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The effect of ZnO nanoparticle filler on the attenuation of ZnO/PCL nanocomposites using microstrip line at microwave frequency / Abubakar Yakubu in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 2 (05/2015)
[article]
Titre : The effect of ZnO nanoparticle filler on the attenuation of ZnO/PCL nanocomposites using microstrip line at microwave frequency Type de document : texte imprimé Auteurs : Abubakar Yakubu, Auteur ; Z. Abbas, Auteur ; F. Esa, Auteur ; P. Tohidi, Auteur Année de publication : 2015 Article en page(s) : p. 227-232 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux)
Matériaux hybrides
Micro-ondes
Nanoparticules
Oxyde de zinc
Poly-e-caprolactoneIndex. décimale : 668.4 Plastiques, vinyles Résumé : This paper describes attenuation measurement using the modified microstrip line technique from new microwave substrate material. The magnitudes of the transmission coefficient (S21) from the microstrip measurement were used to determine the attenuation of the ZnO/PCL nanocomposites substrate with respect to different percentages of ZnO nanoparticles filler. Result from the measurement showed amongst others that as the filler content increases, the attenuation increases. The highest magnitude for attenuation was calculated for the 70% ZnO nano filler with a value of 14.92 dB and the least attenuation was calculated for the 25% ZnO nano filler, which value gave 6.72 dB which is very good for shielding applications. Transmission electron microscope (TEM) was used to analyse the average particle size of the ZnO powder used as filler in the study. The analysis showed that the average particle size was 52.7 nm. DOI : 10.3139/217.2993 En ligne : https://drive.google.com/file/d/1cOz_KRTOo2yYwtzSB0JPFlNgPWHwZMpv/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23896
in INTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 2 (05/2015) . - p. 227-232[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17180 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : The flexibility of finishing Type de document : texte imprimé Auteurs : Flavio Guarda, Auteur Année de publication : 2002 Article en page(s) : p. 47-49 Langues : Anglais (eng) Catégories : Agent mattant
Charges (matériaux)
Cires
Colorants
Cuirs et peaux -- Finition
Emulsions
Epaississants
Liants
PigmentsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The main purpose of finishing is to provide different types of leather with characteristics that satisfy the requirements of a continuously evolving global market.
These charateristics include following : colour, brightness, matting, feel, softness, print pattern, water resistance, special physical properties.
Almost all types of hides and skins can be finished. The final uses of the different leathers is wide and includes shoe uppers, furniure and automotive upholstery, garments and leather goods. It is therefore very important for the finisher to know the final leather use in order to adjust the finishing in the best way.
The range of the chemical products used in finishing is considerable, and combinations of these products can produce almost any effect or property. These auxiliaries can be divided into the following groups:Note de contenu : - BINDERS : Acrylic binders - Polyurethane binders - Butadiene binders - Protein binders - Crosslinkes
- MATTING AGENTS
- FILLERS
- WAXES
- WETTING AND PENETRATING AGENTS
- THICKENING AGENTS
- EMULSIONS AND SOLVENT BASED PRODUCTS : Nitro-ceLlulose lacquers and emulsions - Cellulose acetobutyrate (CAB) laquers and emulsions - Mono and two-component solvent-borne polyurethanes - Aqueous and solvent-borne silicones - Fluorine derivitives
- PIGMENTS
- LIQUID DYESTUFFSEn ligne : https://drive.google.com/file/d/1_IuF_5LsR0Dz_zarxXJ4W1DgVf0WtFdc/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32264
in WORLD LEATHER > Vol. 15, N° 5 (08-09/2002) . - p. 47-49[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006180 - Périodique Bibliothèque principale Documentaires Disponible The influence of melt-mixing conditions and state of dispersion on crystallisation, rheology and mechanical properties of PCL/sepiolite nanocomposites / M. Eriksson in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 3 (07/2020)
[article]
Titre : The influence of melt-mixing conditions and state of dispersion on crystallisation, rheology and mechanical properties of PCL/sepiolite nanocomposites Type de document : texte imprimé Auteurs : M. Eriksson, Auteur ; M. Meuwissen, Auteur ; Ton Peijs, Auteur ; H. Goossens, Auteur Année de publication : 2020 Article en page(s) : p. 302-313 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile
Caractérisation
Charges (matériaux)
Composites -- Propriétés mécaniques
Cristallisation
Dispersions et suspensions
Etat fondu (matériaux)
Matériaux hybrides -- Propriétés mécaniques
Mélange
Morphologie (matériaux)
Nanoparticules
Poly-e-caprolactone
Rhéologie
SépioliteLa sépiolite est un minéral du groupe des argiles à structure fibreuse. Le nom de ce minéral dérive d'un terme grec ancien, francisé en sépion et qui désigne l'os de seiche.
Chaque fibre est formée d'une multitude de tunnels (ou canalicules) d'environ 1 nm^2 régulièrement espacés (voir "Structure cristalline"). Cette configuration particulière en briques creuses allongées, propre à son arrangement cristallin, lui confère une surface spécifique très importante: 394 m^2/g.
Suivant les carrières dont elle est extraite, on note la présence de fer, d'aluminium voire de nickel et même de manganèse dans la structure cristalline de la sépiolite.
Structure cristalline : La formule générale retenue dans la littérature est Mg4 Si6 O15 (OH)2 · 6(H2O).
La structure est en doubles feuillets de type mica, mais la polarité de chaque feuillet s’inverse tous les 6 tétraèdres, formant ainsi une structure 3D de doubles rubans anastomosés créant les canalicules décrits ci-dessus.
Elle appartient au groupe d'espace Pnan, avec comme paramètre de maille : a = 13.43 Ã…, b = 26.88 Ã…, c = 5.281 Ã….Index. décimale : 668.4 Plastiques, vinyles Résumé : It is generally accepted that the benefit of anisotropic nanofiller addition is strongly dependent on the state of the dispersion of these fillers in a polymer matrix. In this paper the influence of melt-compounding conditions on the dispersion of a needle-like clay, i. e. sepiolite, in poly(∊-caprolactone) (PCL) is investigated. The crystallisation behavior as well as the rheological and mechanical properties of PCL/sepiolite nanocomposites with filler contents up to 5 wt.% are studied. By changing the screw speed during melt-mixing in a micro-compounder, the state of dispersion was varied, with the higher speed leading to better dispersion and breakdown of the sepiolite agglomerates or bundles. Rheometry showed that better dispersed nanocomposites displayed an increase in viscosity due to network formation at slightly higher filler loadings. Likewise, better dispersed composites showed a modest increase in crystallisation temperature at low filler content, accompanied by a decrease in both nucleation efficiency and degree of crystallisation at higher loadings. Better dispersed nanocomposite systems also showed superior mechanical properties, particularly at higher filler loadings. However, overall the reinforcing efficiency of sepiolite in all nanocomposites was relatively low. This was mainly a consequence of the relatively low filler aspect ratio and the simultaneous breakup of sepiolite needles together with a breakdown of bundles during compounding. Note de contenu : - EXPERIMENTAL METHODS : Materials - Sample preparation - Characterisation techniques
- RESULTS AND DISCUSSION : Morphology of nanocomposites - Rheological behavior - Crystallisation behavior - Mechanical propertiesDOI : https://doi.org/10.3139/217.3890 En ligne : https://drive.google.com/file/d/1C_PoBRUAR8AK71yz3RRYp8Apgx65kZFp/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34495
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 3 (07/2020) . - p. 302-313[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21818 - Périodique Bibliothèque principale Documentaires Disponible The preparation and characteristics of surface treated barium sulfate extender pigment / Manu Gupta in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 2 (03/2013)
[article]
Titre : The preparation and characteristics of surface treated barium sulfate extender pigment Type de document : texte imprimé Auteurs : Manu Gupta, Auteur ; P. K. Kamani, Auteur ; R. K. Shukla, Auteur Année de publication : 2013 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Charges (matériaux)
Chimie des surfaces
Pigments métalliques
Sulfate de baryum
Traîtements de surfaceIndex. décimale : 667.9 Revêtements et enduits Résumé : This article deals with the treatment of barium sulfate extender pigment with iron oxide and its phenomenological adsorption mechanism in the presence of H+ and OH? ions in solution. The pH range taken in the present study is 5–6. By depositing a ferric oxide layer on barium sulfate particles a novel pigment with better optical and functional performance is obtained. This pigment in various coating systems improves physicochemical performance and acts as an active barrier. The treated pigments can be suitably used in different architectural and industrial coatings. The experimental techniques of surface treatment are discussed, along with the instrumental analysis by SEM, EDAX, XRD, etc. Note de contenu : - EXPERIMENTAL : Materials used - Preparation of the surface treated barium sulfate extender pigments - Influence of pH and charge transfer mechanism - Preparation of coatings - Instrumental analysis - Methods for pigment evaluation - Physical tests of painted films
- RESULTS AND DISCUSSION : Spectral reflectance of the treated barium sulfate extender pigment - The appearance analysis by SEM - Energy dispersive analyzer X-ray spectrometry (EDAX) studies - X-ray diffraction data of treated barium sulfate extender pigment - Evaluation of barium sulfate extender pigment - Chemical resistance properties - Effect of pigment concentration on the coatings propertiesDOI : 10.1007/s11998-012-9433-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9433-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18237
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 2 (03/2013)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14920 - Périodique Bibliothèque principale Documentaires Disponible 15125 - Périodique Bibliothèque principale Documentaires Disponible 15592 - Périodique Bibliothèque principale Documentaires Disponible The use of engineered silica to enhance coatings / Jim Reader in COATINGS TECH, Vol. 17, N° 6 (06/2020)
[article]
Titre : The use of engineered silica to enhance coatings Type de document : texte imprimé Auteurs : Jim Reader, Auteur ; Maria Nargiello, Auteur Année de publication : 2020 Article en page(s) : p. 36-45 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Brillance (optique) -- Mesure
Charges (matériaux)
Déperlance
Dispersions et suspensions
Fluidisation
Formation de film
Imperméabilisation
Matériaux amorphes
Mouillabilité
Résistance à l'abrasion
Rhéologie
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : The field of coatings technology has utilized many forms of silica-based particles in the last 70 years. This large, varied class of fillers is generically broken into two categories of crystalline and amorphous morphology. With ongoing scrutiny and sensitivity in the coatings industry to move towards less hazards in the workplace, greater emphasis is placed on suitable amorphous technology to replace crystalline silica technology. Amorphous silica is highly adaptable and flexible to be modified in both powder and pre-dispersed forms, and numerous engineered types of technologies have been developed to provide functional solutions to many coatings problems.
Amorphous silica technology has been developed to address functionalities including: rheological control, suspension of pigments and fillers, and reinforcement of coatings film; to impart scratch resistance, hydrophobicity / anti-corrosion benefits, and oleophobicity; as a carrier of trace actives into coatings for homogenous distribution; for flow control, charge, and fluidization enhancement of powdered coatings; and gloss reduction of liquid systems. Particle technology and modification will be addressed along with performance attributes highlighted for each of the types of tailor-made modifications. The importance of proper dispersion and homogenous distribution within a coating matrix will be reviewed.
This article will address how amorphous silica technology is differentiated and engineered to create specially tailored solutions to enhance the performance of coatings and will highlight the latest technical developments in this field.Note de contenu : - Rheology and film formation
- Anti-corrosion/water repellency
- Scratch resistance
- Free flow, fluidization, transfer efficiency
- Gloss control
- Recent developments in silica technology
- Fig. 1 : The silica family tree
- Fig. 2 : Production of pyrogenic (fumed) silica
- Fig. 3 : Primary, secondary, and tertiary structures of fumed silicas
- Fig. 4 : Methanol wettability of differently treated fumed silicas
- Fig. 5 : Thickening efficiency of fumed silica as a function of surface treatment
- Fig. 6 : Improved film formation with fumed silica dispersions
- Fig. 7 : Improved corrosion resistance with hydrohobically treated fumed silica ; coatings based on published guide formulations from Halox
- Fig. 8 : Structure modification of fumed silica and scratch resistance
- Fig. 9 : Homogeneous distribution of silica through a polymer matrix
- Fig. 10 : Improved scratch resistance results in a high-soilds, 2K polyurethane clear coat based on Macrymal SM 510n60LG and Vestanat HB 2640MX
- Fig. 11 : Transfer efficiency and Faraday cage effects
- Fig. 12 : Fluidization efficiency
- Fig. 13 & 14 : Measuring gloss with a reflectometer (DIN EN ISO 2813)
- Fig. 15 : SEM images of a new spherical precipitated silica particles
- Fig. 16 : Viscosity "jump curves" for waterbased silica dispersions
- Table 1 : Comparison of characteristics of different synthetic silicas
- Table 2 : Common surface treatments for fumed silicasEn ligne : https://drive.google.com/file/d/17TVd7hca18xX6Tv0Yq4-_5oKHwAWTdO8/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34358
in COATINGS TECH > Vol. 17, N° 6 (06/2020) . - p. 36-45[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21822 - Périodique Bibliothèque principale Documentaires Disponible The use of spherical extenders in VOC compliant coatings / Ben J. Carlozzo in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 870 (07/1997)
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PermalinkThermal analysis to improve yacht finish / Rico Ricotti in EUROPEAN COATINGS JOURNAL (ECJ), N° 12 (12/2015)
PermalinkThermal conductivity of polypropylene composites with combined boron nitride fillers / W. Cheewawuttipong in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 2 (05/2014)
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PermalinkTravaux pratiques. Formulons des produits de maquillage / François Ledoux in L'ACTUALITE CHIMIQUE, N° 323-324 (10-11/2008)
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