Air convective drying and curing of polyurethane-based paints on sheet molding compound surfaces / S. Vessot in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 882 (07/1998)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 70, N° 882 (07/1998) . - p. 67-76 Titre : Air convective drying and curing of polyurethane-based paints on sheet molding compound surfaces Type de document : texte imprimé Auteurs : S. Vessot, Auteur ; J. Andrieu, Auteur ; Jocelyne Galy, Auteur ; J. F. Gérard, Auteur ; P. Laurent, Auteur Année de publication : 1998 Article en page(s) : p. 67-76 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cinétique chimique Matériaux -- Imprégnation Polymérisation Polyuréthanes Réticulation (polymérisation) Revêtements Revêtements bi-composant Index. décimale : 667.9 Revêtements et enduits Résumé : In this study the kinetics and phase changes which occurred during the convective drying of a model car paint based on the polyurethane chemistry is described. The competition between the kinetics of the solvent removal and the phase changes, such as the gelation and/or the vitrification of the polyurethane, needs to be taken into account to avoid the defects in the resulting dried coating. The kinetics of polycondensation of a two-component polyurethane based on polyester triol and triisocyanate in a mixture of various solvents was studied as a 100 μm thick layer on sheet molding compound (SMC) and zinc plated steel plates. Differential scanning calorimetry (DSC) and Fourier-Transform infrared spectrometry (FTIR) and thermogravimetric analysis (TGA) during isothermal curings allowed us to determine the rate constants and the activation energies by using second and third order autocatalytic models. Note de contenu : - EXPERIMENTAL : Reagents and substrates - RESULTS AND DISCUSSION : Effect of temperature - Effect of the stoichiometric ratio - Effect of the substrate nature Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18018 [article]

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Morphology and mechanical properties of compatibilized bio-sourced PA/plasticized starch grafted PP ternary polymer blends / F. Teyssandier in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 452-460 Titre : Morphology and mechanical properties of compatibilized bio-sourced PA/plasticized starch grafted PP ternary polymer blends Type de document : texte imprimé Auteurs : F. Teyssandier, Auteur ; Philippe Cassagnau, Auteur ; J. F. Gérard, Auteur ; N. Mignard, Auteur Année de publication : 2012 Article en page(s) : p. 452-460 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Alliages polymères -- propriétés mécaniques Bioplastiques Biopolymères Copolymères greffés Epoxydes Extrudeuse bi-vis Matières plastiques -- Extrusion:Polymères -- Extrusion Morphologie (matériaux) Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Polypropylène Index. décimale : 668.9 Polymères Résumé : Polymer blends of biosourced polyamide (Rilsan XD) and thermoplastic starch grafted polypropylene (LAB4270) were processed by means of a co-rotating twin-screw extruder, using a solid epoxy resin (D.E.R. 664UE) as a compatibilizer. Morphologies as well as rheological, thermal and mechanical properties of the blends were characterized. The morphology of the reference blend was characterized by nodules of the micron order of magnitude of the dispersed phase (LAB4270) embedded in the polyamide matrix. Even though the morphologies of the blends were not impacted by the addition of the epoxy resin, the mechanical properties as well as the impact resilience were proved to be enhanced. The thermal properties of the blends were as well influenced. A shift of the crystallization temperatures and a decrease of the crystallization enthalpies of both the polypropylene and the PA XD were observed. Thus the addition of the epoxy resin as compatibilizer had proved to be truly effective to obtain a material mostly biosourced with mechanical properties that tend towards combined optimal properties of the different components of the blend. DOI : 10.3139/217.2576 En ligne : https://drive.google.com/file/d/13wFyUPS9SNpF7UzbhHAgK5145IGu-rR9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15768 [article]

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