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Surface quenching induced microstructure transformations in extrusion foaming of porous sheets / A. Gandhi in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
[article]
Titre : Surface quenching induced microstructure transformations in extrusion foaming of porous sheets Type de document : texte imprimé Auteurs : A. Gandhi, Auteur ; Naresh Bhatnagar, Auteur Année de publication : 2015 Article en page(s) : p. 397-402 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Matières plastiques -- Refroidissement
Morphologie (matériaux)
Mousses plastiques -- Extrusion
Polymères -- Surfaces
Surfaces (technologie)Index. décimale : 668.4 Plastiques, vinyles Résumé : In this article, a new technology is described to manufacture open cell thermoplastic foamed sheets with the aid of surface-quenching phenomenon during an extrusion process. As the gas laden polymer extrudate exits the slit die, its surface is rapidly quenched which results in freezing of cells on the surface, while the cells at the core continue to grow and leads to development of open-cellular microstructure at the core. Influence of chill roll temperature was found to be extremely significant in developing porous morphological attributes. Subsequently, synergistic effect of physical blowing agent (N2) content and chill roll temperature was examined for their expansion ratio and foam thickness. Fascinatingly, with reduced chill roll temperatures open-cell microstructure and high expansion ratio was obtained although its thickness was observed to decrease. Further, influence of chill roll rotating speed on foam microstructure and expansion ratio was studied. Lower chill roll rotational speed resulted in development of open-cellular microstructure; while at higher speeds, closed cell morphology was obtained. The results coherently demonstrate that by controlling the chill roll temperatures ; open-cellular microstructure can be developed in sheet extrusion foaming process. Note de contenu : - EXPERIMENTAL : Materials - Foaming methodology - Foam characterization
- RESULTS AND DISCUSSIONS : Influence of surface quenching on foam morphology - Synergistic effect of blowing agent content and surface quenching on open cell microstructure development - Influence of chill roll rotational speed on open cell microstructure developmentDOI : 10.3139/217.3057 En ligne : https://drive.google.com/file/d/1ZdtFspE921BkZifuo1NnEHi5DBDGXFFX/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24335
in INTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 3 (07/2015) . - p. 397-402[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible Des surfaces antibactériennes et autostériles / Francis Rondelez in L'ACTUALITE CHIMIQUE, N° 10 (10/1999)
[article]
Titre : Des surfaces antibactériennes et autostériles Type de document : texte imprimé Auteurs : Francis Rondelez, Auteur ; Pascal Bezou, Auteur Année de publication : 1999 Article en page(s) : p. 4-8 Note générale : Bibliogr. Langues : Français (fre) Catégories : Ammoniums quaternaires
Antibactériens
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.
Chlorure de polyvinyle
Couches minces
Greffage (chimie)
Matières plastiques
Surfaces (technologie)Index. décimale : 671.7 Finissage et traitement des surfaces Résumé : A new approach of soft chemistry in solution is proposed which allows the elaboration of materials with exceptional biocidal properties. In the near future, they should offer better control of the bacteria growth in our surroundings. On the contrary to the systems presently available ont the market, in which biocidal molecules are gradualy released, thecrux of the method is to functionalize the substrate with biocidal molecules covalently bonded to the solid surface. We haveused the recent developments of self-assembled monolayers to form ultra thin layers of long-chain quarternary ammonium compounds, with controlled architecture. The thickness is monomolecular and the grafting density is large. The high local concentration of biocidal molecules creates conditions rarely encountered in classical bacteriology. Such materials constitute a new weapon against bacteria infections in operating rooms, in our food, or in our living quarters. En ligne : https://new.societechimiquedefrance.fr/numero/des-surfaces-antibacteriennes-et-a [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7263
in L'ACTUALITE CHIMIQUE > N° 10 (10/1999) . - p. 4-8[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 002153 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Les surfaces Evolon Type de document : texte imprimé Année de publication : 2001 Langues : Multilingue (mul) Catégories : Hydrophilie
Nontissés -- Propriétés mécaniques
Nontissés -- Propriétés physiques
Résistance à la déchirure
Surfaces (technologie)
Textiles et tissus à usages techniques
Traction (mécanique)Index. décimale : 677.6 Tissus obtenus par des procédés spéciaux, quelle que soit leur composition : jacquard, feutres tissés et non tissés, tapisseries, tissus ajourés Résumé : Le concept de base du projet Evolon a été de produire, par une technique "nontissée", une surface textile qui s'apparenterait le plus possible aux surfaces textiles tissées et tricotées. Ces surfaces acceptent les finitions mécaniques et chimiques classiques et trouvent leurs applications en ameublement et habillement, en particulier dans le domaine du vêtement de sport grâce à leur haute capillarité, leur caractère hydrophile (absorption et élimination de la transpiration) et leur confort. Note de contenu : - PROPRIETES DES SURFACES TEXTILES : Drapabilité - Rupture - Déchirure amorcée - Charges de traction en nontissés - Filage direct de très faibles titres
- LA TECHNOLOGIE EVOLON :
- Fig. 1 : Propriétés textiles et mécaniques d'Evolon comparées aux nontissés et textiles classiques
- Fig. 2 : La technique Evolon
- Tableau : Propriétés textiles/physiques des nontissés EvolonEn ligne : https://drive.google.com/file/d/1-1W6InT6eixrP4NOMmKYSbVZVsP9a9ic/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40739
in TEXTILES A USAGES TECHNIQUES (TUT) > N° 41 (3e trimestre 2001)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22242 - Périodique Bibliothèque principale Documentaires Disponible 010156 - Périodique Bibliothèque principale Documentaires Disponible Surfactant-induced growth of a calcium hydroxide coating at the concrete surface / Eléonore Gueit in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)
[article]
Titre : Surfactant-induced growth of a calcium hydroxide coating at the concrete surface Type de document : texte imprimé Auteurs : Eléonore Gueit, Auteur ; Evelyne Darque-Ceretti, Auteur ; Patrick Tintillier, Auteur ; Matthieu Horgnies, Auteur Année de publication : 2012 Article en page(s) : p. 337-346 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chaux
Matériaux cimentaires -- Revêtements protecteurs
Matériaux hautes performances
Surfaces (technologie)
SurfactantsIndex. décimale : 667.9 Revêtements et enduits Résumé : In addition to its remarkable mechanical properties, high-performance concrete (HPC) also exhibits a very smooth surface with low porosity, which makes it particularly suitable for esthetic applications. Unfortunately, the constant environmental aggressions to which the urban buildings are exposed (organic or inorganic particles, algae, micro-organisms, staining from various sources) are a threat to their structural and esthetic durability. This article proposes an innovative method to protect HPC surfaces based on Ca(OH)2 growth at the fresh concrete/formwork interface. With the adequate surfactants used as demolding agents, it is possible to grow a continuous layer of Ca(OH)2 at the concrete surface which closes the porosity, reduces the water uptake, and gives the surface super-hydrophilic properties, facilitating self-cleaning mechanisms. Note de contenu : - MATERIALS AND METHODS : Preparation of mortar samples - Scanning electron microscopy - Image analysis - Water absorption
- RESULTS : Influence of the surfactants on the Ca(OH)2 crystals - Influence of the portlandite on mortar surface properties
- DISCUSSION : Influence of the surfactants on Ca(OH)2 nucleation - Influence of the surfactants on Ca(OH)2 structure - Influence of the Ca(OH)2 crystals on mortar surface propertiesDOI : 10.1007/s11998-011-9368-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9368-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15964
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 337-346[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14188 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of fluorinated acrylate polymer and preparation and properties of antifouling coating / Yan Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 1 (01/2015)
[article]
Titre : Synthesis of fluorinated acrylate polymer and preparation and properties of antifouling coating Type de document : texte imprimé Auteurs : Yan Zhang, Auteur ; Yu-hong Qi, Auteur ; Zhan-ping Zhang, Auteur ; Guang-yu Sun, Auteur Année de publication : 2015 Article en page(s) : p. 215-223 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fluoropolymères
Polyacrylates
Polyacryliques
Polymères -- Propriétés mécaniques
Revêtements antisalissures
Surfaces (technologie)
VernisIndex. décimale : 667.9 Revêtements et enduits Résumé : Fluorinated acrylate quadripolymer (QPFA), acrylate bipolymer (BPFA), and acrylate homopolymer (HPFA) were synthesized by free radical polymerization using different monomers. The three fluoropolymers (5%) were mixed respectively with acrylic varnish, and HPFA at different concentrations (1, 3, 5, 7, and 10 wt%) was mixed with acrylic varnish. The polymer films were characterized by differential scanning calorimetry, X-ray diffraction, water absorption rates, and contact angle analyses; the coatings were characterized by confocal laser scanning microscopy, mechanical analyses, water contact angles, water absorption rates, and biofouling analyses. Results indicate that the three coatings containing different fluoropolymers have comparable mechanical properties. The QPFA coating featured the lowest resistance to benthic diatom adhesion because of its low fluorine content. With increasing fluorine contents, the mechanical properties of the HPFA coatings decreased. However, the contact angles and resistance to adhesion increased. Though the HPFA particles lowered adhesion between the matrix and coating, they simultaneously generated rough surfaces. Note de contenu : - EXPERIMENTAL METHOD AND MATERIALS : Raw materials - Synthesis of fluorinated acrylate polymers - Synthesis of fluorinated acrylate quadripolymer (QFPA) - Synthesis of fluorinated acrylate bipolymer (BFPA) - Synthesis of fluorinated acrylate homopolymer (HPFA) - Preparation of coating - Characterization
- RESULTS AND DISCUSSION : Polymer film properties - Coating performanceDOI : 10.1007/s11998-014-9623-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9623-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23220
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 1 (01/2015) . - p. 215-223[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16952 - Périodique Bibliothèque principale Documentaires Disponible Synthesis of fluorinated polyacrylic acrylate oligomer for the UV-curable coatings / Jianbing Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)
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