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Case Study : Composite surface smoothness improvement / Fredrik Ohlsson in JEC COMPOSITES MAGAZINE, N° 63 (03/2011)
[article]
Titre : Case Study : Composite surface smoothness improvement Type de document : texte imprimé Auteurs : Fredrik Ohlsson, Auteur Année de publication : 2011 Article en page(s) : p. 21-22 Langues : Anglais (eng) Tags : 'Tissu textile' 'Fibre minérale' 'Etude expérimentale' 'Surface lisse' Fabrication carbone' verre' 'Matériau renforcé fibre' Stratifié 'Renforcement mécanique' Polymère composite' Index. décimale : 668.4 Plastiques, vinyles Résumé : Spread Tow Fabrics could be a valuable solution to improve the surface smoothness of composites, reducing print-through and visual defects. These reinforcements could reduce the use of extra fillers, padding and thick gelcoats, leading to weight and labour savings. Here is a case study describing how the Finnish company Baltic Yachts successfully improved their composite hulls through the use of Spread Tow Fabrics. Note de contenu : - Surface smoothness of composites
- Practical case study
- Measurements and analysis
- Benefits of spread tow fabricsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13764
in JEC COMPOSITES MAGAZINE > N° 63 (03/2011) . - p. 21-22[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013161 - Périodique Bibliothèque principale Documentaires Disponible Change in surface chemistry of the cuticle of human hair by chemical and photochemical oxidation / Sigrid B. Ruetsch in IFSCC MAGAZINE, Vol. 7, N° 4 (10-11-12/2004)
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Titre : Change in surface chemistry of the cuticle of human hair by chemical and photochemical oxidation Type de document : texte imprimé Auteurs : Sigrid B. Ruetsch, Auteur ; Yash K. Kamath, Auteur Année de publication : 2004 Article en page(s) : p. 299-307 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Chemical and photochemical oxidation' 'surface lipids (F-layer)' microfluorometry 'single fiber surface wettability scanning' 'fiber-to-fiber friction force measurements' 'X-ray photoelectron spectroscopy' Index. décimale : 668.5 Parfums et cosmétiques Résumé : This is a multifaceted study on the characterization and quantification of damage to the hair fiber surface caused by photochemical and cosmetic chemical oxidative processes. Unique techniques were used, including a microfluorometric method that had been adapted to characterize and quantify the delipidation and acidification of the human hair surface during light exposure and cosmetic chemical grooming processes such as bleaching. During photochemical and chemical oxidation, breakdown of the lipid domains (also called the F-layer) of the outer b-layer occurs on the exposed scale faces and cysteic acid groups are generated on the cuticle cell surface. The newly formed acid functionalities can be tagged with the cationic fluorochrome Rhodamine B, allowing not only quantification of the level of progressive acidification but also localization of the newly formed acid functionalities. On the other hand, the negative charges generated on the hair surface by oxidation can also bind low molecular weight quaternary cationic conditioning compounds such as cetyltrimethylammonium bromide. This process can be considered a relipidation by adsorption. We have shown that the entire process of delipidation/acid formation and subsequent relipidation by adsorption on the scale faces can be quantified by X-ray photoelectron spectroscopy. Since X-ray photoelectron spectroscopy analysis is highly sensitive and able to detect atomic species at the very surface of the hair fibers, receiving signals from an escape depth as shallow as 25 Å, it appeared ideal for the characterization of treatment-induced changes in the hair surface. However, X-ray photoelectron spectroscopy provides an average elemental composition of the hair surface including scale faces and scale edges. The microfluorometric technique, on the other hand, can distinguish progressive delipidation of the scale faces from changes occurring at the broken scale edges. This distinction was shown and characterized in detail by slow speed microfluorometric scanning of the hair surface. Chemical and photochemical oxidative processes at the hair surface result in certain collateral effects. Particularly changes in surface wettability and fiber friction are of significance to the cosmetic chemist because they affect the spreading and wicking of products in hair as well as the managability and the body of hair assemblies. Methods of characterizing these effects are discussed briefly. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10483
in IFSCC MAGAZINE > Vol. 7, N° 4 (10-11-12/2004) . - p. 299-307[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003885 - Périodique Bibliothèque principale Documentaires Disponible Determination of thermal response on mold surface and recommendation of feasible heating time and gas flow rate for a circular cavity by gas preheating / S.-W. Chang in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 1 (03/2012)
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Titre : Determination of thermal response on mold surface and recommendation of feasible heating time and gas flow rate for a circular cavity by gas preheating Type de document : texte imprimé Auteurs : S.-W. Chang, Auteur ; Y. H. Lee, Auteur Année de publication : 2012 Article en page(s) : p. 30-39 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Moules d'injection Tags : 'Surface moule' 'Temps chauffage' 'Préchauffage haute température gaz' 'Réponse thermique' 'Modèle mathématique' 'Transfert masse' bi-fluide' 'Analyse dimensionnelle' Index. décimale : 668.9 Polymères Résumé : This paper studies the thermal response on the mold surface of a circular cavity in the preheating process by high-temperature gas via a numerical approach, where the heat and mass transfer inside the cavity and mold are predicted by a two-fluid model. The dimensionless parameter group is identified from a dimensional analysis of the gas preheating problem. The correlations among dimensionless parameters are established by a least square method applied to the numerical predictions. The upper limit of the temperature rise on the cavity surface at a given gas flow rate is found approximately proportional to the square root of Q* and h*, respectively. The lower limit of gas flow rate to achieve a given temperature rise on the cavity surface is inversely proportional to h* but grows with (Q*)1.5. The first limiting line to describe the dependence of Q* on t* is independent of h* and T*, but the second one is governed by Q*c. For reaching a specified temperature rise on the cavity surface, the growth in the thickness of thermal resistive layer reduces the required preheating time but increases the corresponding gas flow rate. The dependence of (t∗ƒ, Q∗ƒ) on the parameter group (T*, h*) is given in this study to obtain the reasonable combinations of (t*ƒ , Q*ƒ) based on the balance between the allowable preheating time and heating capacity. Note de contenu : - MATHEMATICAL MODEL : Governing equations - Boundary conditions - Numerical scheme
- DESCRIPTION OF STUDIED CASEDOI : 10.3139/217.2500 En ligne : https://drive.google.com/file/d/1Ek2BafMIA1ak7SI7Jm5gXPBhWvYVbtNc/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13719
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 1 (03/2012) . - p. 30-39[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13722 - Périodique Bibliothèque principale Documentaires Disponible UV radiation curing of surface coatings based on ENR-cycloaliphatic diepoxide-glycidyl methacrylate system by cationic photoinitiators-optimization of process variables through response surface methodology / R. N. Kumar in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 896 (09/1999)
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Titre : UV radiation curing of surface coatings based on ENR-cycloaliphatic diepoxide-glycidyl methacrylate system by cationic photoinitiators-optimization of process variables through response surface methodology Type de document : texte imprimé Auteurs : R. N. Kumar, Auteur ; Woo Choon Kong, Auteur ; Abusamah Abubakar, Auteur Année de publication : 1999 Article en page(s) : p. 79-88 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Matériau revêtement' Peinture Durcissement 'Rayonnement UV' 'Caoutchouc naturel époxydé' Diépoxyde 'Epoxyde résine' 'Méthacrylate de glycidyle copolymère' Photoamorceur 'Propriété mécanique' Feuil 'Etude expérimentale' 'Surface réponse' Index. décimale : 667.9 Revêtements et enduits Résumé : This paper reports on the results of the ultraviolet curing of surface coatings based on cycloaliphatic diepoxide-epoxidized natural rubber (ENR)-glycidyl methacrylate (GMA) system with a cationic photoinitiator. The results reported in our earlier publication showed that ENR acts as a toughening agent for the otherwise brittle epoxy resin, and that GMA functions as a crosslinking agent in the system and promotes adhesion between the elastomeric domain and the resin matrix. In this paper, the results of the effect of operating variables on the properties of the cured film are reported. Response surface methodology (RSM) was employed to collect data and to establish the functional relationships between operating variables and performance characteristics of the cured coatings. The data are represented in three-dimensional response surface plots. These plots not only enable the interpretation of results, but also allow the determination of the optimum treatment combinations required to maximize the properties of the surface coatings. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17942
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 896 (09/1999) . - p. 79-88[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003564 - Périodique Bibliothèque principale Documentaires Disponible Impact de gouttes de fluides à seuil : rhéologie, splash et cratères / Li-Hua Luu in RHEOLOGIE, Vol. 20 (12/2011)
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Titre : Impact de gouttes de fluides à seuil : rhéologie, splash et cratères Type de document : texte imprimé Auteurs : Li-Hua Luu, Auteur ; Yoël Forterre, Auteur Année de publication : 2012 Article en page(s) : n. p. Note générale : Bibliogr. Langues : Français (fre) Catégories : Elastoviscoplasticité
Fluides à seuils
RhéologieTags : 'Fluide seuil' 'Elasto-visco-plasticité' 'Impact gouttes' 'Surface super-hydrophobe' 'Micro-gel Carbopol' Index. décimale : 532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) Résumé : Les fluides à seuil (boue, dentifrice, béton frais...) se caractérisent par l'existence d'une contrainte seuil Tc, en-dessous de laquelle ils se comportent comme un solide élastique et au-dessus de laquelle ils coulent. Leur comportement en écoulement est relativement bien décrit par le modèle de Hershel-Bulkley en régime stationnaire : T=Tc + K (dY/dt)n quand T>Tc, où K est la consistance du fluide et n est un paramètre sans dimension. Dans quelles mesures les rhéologies simples obtenues en rhéomètres permettent-elles de décrire des écoulement complexes ? Cette thèse porte sur l'étude expérimentale de l'impact des gouttes de différents fluides à seuil modèles sur des surfaces rigides ou meubles. Au-delà des applications (impression à jet d'encre solide, modélisation d'impact solide à grandes vitesses), cette configuration hydrodynamique est un moyen original de sonder la rhéologie à temps court de ces fluides complexes. En particulier, l'écoulement fortement instationnaire durant l'impact révèle les propriétés viscoélastiques du micro-gel Carbopol. Note de contenu : - Impact sur une surface solide : rôle de l'élasticité à temps court
- Etalements géants et réduction de trainée apparente
- Impact sur une surface meuble : formation de cratèresEn ligne : http://tel.archives-ouvertes.fr/docs/00/58/09/81/PDF/TheseLihua-2011.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13043
in RHEOLOGIE > Vol. 20 (12/2011) . - n. p.[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13519 - Périodique Bibliothèque principale Documentaires Disponible Performance of paint systems after UHP (part 3) / Philippe Le Calvé in PROTECTIVE COATINGS EUROPE (PCE), Vol. 4, N° 1 (01-02-03/2012)
PermalinkConception de panneaux de grandes particules / Frédéric Bos in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 9, N° Hors série (1999)
PermalinkCuticular damage to african-american hair during relaxer treatments - A microfluorometric and SEM study - / Sigrid B. Ruetsch in IFSCC MAGAZINE, Vol. 11, N° 2 (04-05/2008)
PermalinkFrom contact angle titration to chemical force microscopy : a new route to assess the pH-dependent character of the stratum corneum / Matthieu wagner in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 34, N° 1 (02/2012)
PermalinkGonflement tri-dimensionnel : Formulation par la méthode des tubes de courant et résultats numériques / Magdeleine Normandin in LES CAHIERS DE RHEOLOGIE, Vol. XI, N° 3-4 (10/1993)
PermalinkImportance of substrate roughness for in-vitro sun protection assessment / Louis Ferrero in IFSCC MAGAZINE, Vol. 9, N° 2 (04-05-06/2006)
PermalinkMeasuring the gloss of curved surfaces / B. Duncan in SURFACE COATINGS INTERNATIONAL, Vol. 79, N° 4 (04/1996)
PermalinkSynthesis, characterization and thermodynamic parameters of anionic gemini surfactants with different spacer groups / H. El-sharkawy Ali in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 5/2007 (10-11/2007)
PermalinkVisible skin condition and perception of human facial appearance / N. Samson in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 32, N° 3 (06/2010)
PermalinkConception d'une cellule de Couette excentrée transparente pour l'étude du comportement d'écoulement de fluides visqueux à l'interface avec la paroi / P. Thirunavukkarasu in RHEOLOGIE, Vol. 39 (06/2021)
PermalinkEffect of alkyl substitution on styling and conditioning properties of co(Vinyl pyrrolidone - DMAPMA - DMAPMA+ - C12H25Cl-) / J. Jachowicz in IFSCC MAGAZINE, Vol. 5, N° 1 (01-02-03/2002)
PermalinkLight switchable adhesives debond on demand / Daniel Jacobsson in ADHESION - ADHESIVES + SEALANTS, N° 1/2010 (2010)
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