Macroscopic volume, van der waals volume and free volume after cure versus chemical conversion for a high-Tg epoxy/amine thermosetting system / R. A Venditti in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 844 (05/1995)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 844 (05/1995) . - p. 47-56 Titre : Macroscopic volume, van der waals volume and free volume after cure versus chemical conversion for a high-Tg epoxy/amine thermosetting system Type de document : texte imprimé Auteurs : R. A Venditti, Auteur ; J. K. Gillham, Auteur ; Y. Lou, Auteur ; Y. C. Jean, Auteur Année de publication : 1995 Article en page(s) : p. 47-56 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calorimétrie Dilatation (thermodynamique) Epoxydes Polyamines Positons -- Annihilation Réticulation (polymérisation) Thermodurcissables Transition vitreuse Index. décimale : 667.9 Revêtements et enduits Résumé : sothermal glassy-state properties of cured thermosetting materials pass through maximum and minimum values with increasing chemical conversion. In this work a diglycidyl ether of bisphenol A (a diepoxide) and trimethylene glycol di-p-aminobenzoate (a tetra-functional aromatic diamine) system (DGEBA/TMAB) has been investigated for the purpose of analyzing the behavior after cure of the isothermal properties of the glass with increasing conversion. The glass transition temperature (Tg) is used as a direct measure of conversion. The density, Tg, modulus, and free volume of the material after cure with increasing conversion was measured. The specific volume at 25°C after cure passes through a minimum and the modulus passes through a maximum with increasing conversion (Tg). The fractional fraction free volume at 25°C after cure passes through a minimum value with respect to conversion. The specific volume, modulus, and fractional free volume at 25°C versus conversion data qualitatively correlate Note de contenu : - EXPERIMENTAL : Chemical system - Mixing procedure - Cure procedure - Density measurements - DSC measurements - Thermal expansion coefficient measurements - positron annihilation spectroscopy - RESULTS AND DISCUSSION : Specific volume versus conversion - Packing density at 298K versus conversion - Comparison of van der waals volume and specific volume versus conversion - Free volume versus conversion - Antiplasticization Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18512 [article]

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A novel micro wall slip model based on chain length and temperature / Y. Lou in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 239-246 Titre : A novel micro wall slip model based on chain length and temperature Type de document : texte imprimé Auteurs : Y. Lou, Auteur ; J.-L. Bai, Auteur ; P.-Q. He, Auteur Année de publication : 2016 Article en page(s) : p. 239-246 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etat fondu (matériaux) Matières plastiques -- Moulage par injection Polypropylène Polystyrène Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : A micro chain length and temperature (MCLT) wall slip model of polymer was developed on the basis of chain length and temperature. The effectiveness and accuracy of the MCLT slip model were verified through a micro-square-column filling rate experiment for Polypropylene (PP) material and a micro-square-column pressure difference experiment for Polystyrene (PS) material. The difference between the simulated data of the MCLT slip model and the experimental data decreased with decreasing feature size. The accuracy of the MCLT slip model was enhanced by decreasing the feature size. When the feature size was decreased to 200 ?m, the maximum deviation between the simulated filling rate by the MCLT slip model and the experimental result was 8.67 %. Moreover, under different shearing rates, the simulated pressure drop by the MCLT slip model was closer to the experimental result than that by the conventional slip model. The micro-scale flow characteristics of the melt were also explored using the MCLT slip model. Melt flow velocity decreased from the center of the micro-channel to the wall, and the wall slip phenomenon was beneficial to the melt flow. Note de contenu : - Establishment of MCLT slip model - Micro-square-column injection filling rate experiment - Micro-square-column pressure difference experiment - Influence of wall slip on flow velocity distribution DOI : 10.3139/217.3191 En ligne : https://drive.google.com/file/d/15Vy55Jfde6m1wO2_vUNfclxtd41Y2P8z/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26182 [article]

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