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A novel non-planar transverse stretching process for micro-porous PTFE membranes and resulting characteristics / Y.-H. Chang in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 1 (03/2018)
[article]
Titre : A novel non-planar transverse stretching process for micro-porous PTFE membranes and resulting characteristics Type de document : texte imprimé Auteurs : Y.-H. Chang, Auteur ; S.-C. Chen, Auteur ; T.-J. Wang ; J. Guo Année de publication : 2018 Article en page(s) : p. 20-28 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etirement (mécanique)
Matériaux -- Epaisseur
Membranes (technologie)
Morphologie (matériaux)
Polytétrafluoréthylène
Porosité
Taille des poresIndex. décimale : 668.4 Plastiques, vinyles Résumé : Polytetrafluoroethylene (PTFE) micro-porous membranes were prepared from PTFE fine powder through extruding, rolling, and uniaxial longitudinally stretching. In contrast to conventional planar transverse stretching, a novel 3D mold design of non-planar transverse stretching process was employed in this study to produce micro-porous structure. The morphology, membrane thickness, mean pore size, and porosity of the PTFE membrane were investigated. The results show that the non-planar transverse stretched membranes exhibit more uniform average pore diameter with thinner membrane thickness. Morphological changes induced by planar and non-planar transverse stretching for pore characteristics were investigated. The stretching conditions, stretching temperature and rate, affect the stretched membrane. Increasing temperature facilitated the uniformity of pore size and uniformity of membrane thickness. Moreover, increase in stretching rate resulted in finer pore size and thinner membrane. Note de contenu : - EXPERIMENTAL : Establishment of non-planar transverse stretching - Membrane preparation and stretching process - Non-planar transverse stretching process
- MEMBRANE CHARACTERISTICS : Measurement - Morphology of membranes - Thickness - Porosity, pore size and pore size distribution
- RESULTS AND DISCUSSION : Thickness and micro-porous structure for longitudinally stretched membranes - Effect of non-planar transverse stretching on membrane thichness and micro-porous structure - Effect of non-planar transverse stretching on micro-porous structure for different positions - Effect of non-planar transverse stretching process to membraneDOI : 10.3139/217.3309 En ligne : https://drive.google.com/file/d/1brsjrn91SwpA4oVvHVH46L0MUbvatj1o/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30155
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Code-barres Cote Support Localisation Section Disponibilité 19659 - Périodique Bibliothèque principale Documentaires Disponible Novel techniques to investigate the impact of cellulose esters on the rheological properties and appearance in automotive basecoat systems / Deepanjan Bhattacharya in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 2 (06/2007)
[article]
Titre : Novel techniques to investigate the impact of cellulose esters on the rheological properties and appearance in automotive basecoat systems Type de document : texte imprimé Auteurs : Deepanjan Bhattacharya, Auteur ; Kab Seo, Auteur ; Louis T. Germinario, Auteur ; Mark D. Clark, Auteur ; Kevin W. McCreight, Auteur ; Chip Williams, Auteur Année de publication : 2007 Article en page(s) : p. 139-150 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acétobutyrate de cellulose
Esters de cellulose
Morphologie (matériaux)
Revêtements -- Additifs:Peinture -- Additifs
Rhéologie
Viscoélasticité
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : The viscous response of a coating formulation changes over several orders of magnitude after application onto a substrate. Furthermore, the performance and application attributes for a refinish basecoat formulation are slightly different from those of an OEM basecoat. The absence of a high temperature baking step during the refinish process necessitates that the paint exhibit very good antisag behavior as well as quick 'dry to touch' without compromising the flow and leveling properties of the coating as it dries. As most paint formulations are multicomponent in nature, it is always a challenge to precisely measure the impact of specific formulation components on the collective performance attributes of the applied coating. In this work, the focus has been to develop novel techniques that can be used to demonstrate a more quantitative measure of some of the performance attributes that rheological additives like cellulose esters can provide to automotive coatings. A series of pigmented basecoat formulations were prepared which contained cellulose acetate butyrates (CABs) of varying molecular weights at different levels based on the total solids of the coating formulation. The nonvolatile content of the formulations was also varied. The viscoelastic behavior of a typical automotive basecoat formulation during the drying process was then investigated using a novel rheological technique. Complex viscosity data (including storage and loss moduli as well as tan delta) were determined as a function of drying time and then compared to the macroscopic properties typically associated with a coating film as it dries. Thermogravimetric analysis (TGA) was also used to correlate the rheology of the metallic basecoat formulations with drying behavior of the coating. The final appearance of the coating was investigated by several microscopic techniques such as Laser Scanning Confocal Microscopy, Scanning Electron Microscopy, Atomic Force Microscopy, and Surface Profilometery, and attempts were made to correlate bulk measurements like 'flop index' with the microstructure of the coating. DOI : 10.1007/s11998-007-9014-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9014-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3655
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Code-barres Cote Support Localisation Section Disponibilité 008269 - Périodique Bibliothèque principale Documentaires Disponible Numerical simulation and experimental validation of granite powder filled jute epoxy composite for slurry jet erosive wear / M. J. Pawar in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 1 (03/2016)
[article]
Titre : Numerical simulation and experimental validation of granite powder filled jute epoxy composite for slurry jet erosive wear Type de document : texte imprimé Auteurs : M. J. Pawar, Auteur ; Amar Patnaik, Auteur ; R. Nagar, Auteur Année de publication : 2016 Article en page(s) : p. 37-50 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire).
Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia)
Analyse numérique
Charges (matériaux)
Composites à fibres végétales
Epoxydes
Granite
Morphologie (matériaux)
Plan d'expérience
Surfaces -- Analyse
Taguchi, Méthodes de (Contrôle de qualité)
Usure (mécanique)Index. décimale : 668.4 Plastiques, vinyles Résumé : In the polymer composite the benefits of utilizing the excellent wear resisting properties in terms of light weight structural design are immediately apparent. Hence, the focus of this study is to propose new sets of unfilled and particulate filled treated jute epoxy composites. Therefore, initially five different weight percentages of alkali treated jute epoxy composites are fabricated (10, 20, 30 40 and 50 wt.%) and studied their slurry erosive wear in experimentally at different operating conditions such as by varying impact velocity and impingement angle by keeping all other factors constant. The steady state erosion results for jute epoxy composites shows better wear resistant behavior for 40 wt.% jute fiber loading. Hence, for further fabrication of series of hybrid composite 40 wt.% jute fiber is kept constant and granite powder is varied in three different (8, 16 and 24 wt.%) weight percentages. The granite filler content in the jute epoxy composite played a major contribution for slurry erosion resistance. Finally, the obtained experimental results are compared with simulated model results by using a computational fluid dynamics tool. The eroded samples are observed through scanning electron microscope to study the wear mechanism. Note de contenu : - MATERIALS AND METHOD : Materials - Composite fabrication - Physical study - Slurry jet erosion wear test conditions and apparatus - Experimental design - Numerical analysis
- RESULTS AND DISCUSSION : Physical studies - Steady state slurry erosion rate - Erosion shape - Numerical analysis - Taguchi design of experiment - ANOVA and the effect of factors - Surface morphology - Comparison of wear rate, fiber/filler content and physical properties of polymer compositesDOI : 10.3139/217.3135 En ligne : https://drive.google.com/file/d/1v_L0YJ5ca8KEVb--MPR-cknqT9lbKRWr/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25767
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Code-barres Cote Support Localisation Section Disponibilité 17899 - Périodique Bibliothèque principale Documentaires Disponible Optimization of milling parameters on the synthesis of stearic acid coated CaCO3 nanoparticles / S. K. Hait in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 2 (03/2014)
[article]
Titre : Optimization of milling parameters on the synthesis of stearic acid coated CaCO3 nanoparticles Type de document : texte imprimé Auteurs : S. K. Hait, Auteur ; Y. Chen, Auteur Année de publication : 2014 Article en page(s) : p. 273-282 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 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.
Fraisage
Hydrophobie
Morphologie (matériaux)
Nanoparticules
Revêtements:Peinture
Stéarique, AcideL'acide stéarique ou acide octadécanoïque (nom IUPAC) est un acide gras à chaîne longue, qu'on symbolise par les nombres 18:0 pour indiquer qu'il a 18 atomes de carbone et aucune liaison covalente double : c'est un acide gras saturé. À température ambiante, il forme un solide blanc. Sa température de fusion est d'environ 70 °C. L'acide stéarique est abondant dans toutes les graisses animales sous la forme de l'ester tristéarate de glycérine (stéarine) C57H110O6 (surtout chez les ruminants) ou végétales. Il sert industriellement à faire des huiles, des bougies et des savons. Sa formule chimique semi-développée est : CH3-[CH2]16-COOH.
Les acides stéarique, laurique, myristique et palmitique constituent un groupe important d'acides gras.
UTILISATIONS : L'acide stéarique est utilisé comme liant ou pigments pour le caoutchouc, agent de polymérisation du phényléthylène (styrolène ou vinylbenzène) et du butadiène afin d'obtenir du caoutchouc synthétique, siccatif de vernis, bougies en cire, craie de cire, savon (l'acide stéarique et l'hydroxyde de sodium forment un savon : le stéarate de sodium) ou émulsifiant et stabilisant en alimentaire E570 (ou stéarate de magnésium E572).
Taille des particules
Traîtements de surfaceIndex. décimale : 667.9 Revêtements et enduits Résumé : Surface modification of precipitated calcium carbonate particles (calcite) in a planetary ball mill using stearic acid as a modification agent for making dispersion in hydrocarbon oil was investigated. Different parameters for processing (milling) such as milling time, ball-to-sample ratio, and molar ratio of the reactant were varied and analyzed for optimization. The physical properties of the hydrophobically modified calcium carbonate particles were measured ; the particle size and morphology of the resulting samples were characterized by transmission electron microscopy and X-ray diffraction. The surface coating thickness was estimated using small angle X-ray scattering. Note de contenu : - EXPERIMENTAL WORK : Material and method - Characterization
- RESULTS AND DISCUSSION : XRD and DLS results - Raman results - Thermogravimetric analysis (TGA) results - Tranmission electron microscopy (TEM) RESULTS - Contact angle measurement results - Small angle X-ray scattering (SAXS) resultsDOI : 10.1007/s11998-013-9547-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9547-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21171
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Code-barres Cote Support Localisation Section Disponibilité 16196 - Périodique Bibliothèque principale Documentaires Disponible Organic carbon dot coating for superhydrophobic aluminum alloy surfaces / Huaqiao Peng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)
[article]
Titre : Organic carbon dot coating for superhydrophobic aluminum alloy surfaces Type de document : texte imprimé Auteurs : Huaqiao Peng, Auteur ; Lin Li, Auteur ; Qiang Wang, Auteur ; Yabo Zhang, Auteur ; Tianming Wang, Auteur ; Baozhan Zheng, Auteur ; Hong Zhou, Auteur Année de publication : 2021 Article en page(s) : p. 861-869 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages
Carbone
Carbone organique
Gravure
Hydrophobie
Morphologie (matériaux)
Mouillabilité
Revêtement auto-nettoyant
Surfaces (Physique)Index. décimale : 667.9 Revêtements et enduits Résumé : A novel fluorine-free and silicon-free superhydrophobic aluminum alloy (treated-Al) is fabricated by chemical etching using hydrochloric acid and hydrogen peroxide and modified with an organic carbon dot (OCD) coating. The water contact angle (CA) of the treated-Al surface increases with the OCD concentration. When etched aluminum (etched-Al) is modified with 0.5 mg/ml OCDs, a CA of 161.4° is achieved, which indicates good nonwettability. SEM results verify that porous microstructures with cavities are uniformly distributed on the surface of etched-Al, in contrast to the bare aluminum alloy, which forms a primary rough structure. After treatment with 0.5 mg/ml OCDs, a nanoparticle coating is dispersed on the rough structures of treated-Al-0.5, which can trap air and make a water droplet essentially rest on a layer of air. The treated-Al-0.5 material has good self-cleaning properties and can sweep away contaminants at both 20 and 0°C. The Ecorr and Icorr of treated-Al-0.5 are − 0.56 V and 2.82 × 10−6 A/cm2, respectively, which shows good anticorrosion performance. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of OCDs - Preparation of superhydrophobic surfaces - Characterization of superhydrophobic surfaces
- RESULTS AND DISCUSSION : Wettability of aluminum surface treated with OCDs - Surface morphology of aluminum surface treated with OCDs - Surface composition - Self-cleaning and anticorrosion applicationsDOI : https://doi.org/10.1007/s11998-020-00449-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00449-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35935
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