RheoDSC analysis of hardening of semi-crystalline polymers during quiescent isothermal crystallization / V. Janssens in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 4 (09/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 4 (09/2010) . - p. 304-310 Titre : RheoDSC analysis of hardening of semi-crystalline polymers during quiescent isothermal crystallization Type de document : texte imprimé Auteurs : V. Janssens, Auteur ; C. Block, Auteur ; G. Van Assche, Auteur ; B. Van Mele, Auteur ; Peter Van Puyvelde, Auteur Année de publication : 2010 Article en page(s) : p. 304-310 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Calorimétrie Cristallisation Polymères semi-cristallins Rhéologie Index. décimale : 668.9 Polymères Résumé : The crystallization of semi-crystalline polymers is often analyzed by rheometry and calorimetry. By rheometry the viscosity evolution during crystallization can be followed, whereas from a calorimetric measurement, the evolution of the degree of crystallinity can be calculated. The time evolution of these material properties is valuable input for polymer processing simulation software and in order to combine the data in a reliable manner, hardening curves are used as a characterization tool. Such a hardening curve correlates the relative increase of the viscosity resulting from crystallization, to the advancing degree of crystallinity. In this study, these are extracted from simultaneous measurements on one sample using a RheoDSC device. The RheoDSC technique allows for the direct combination of the rheological and calorimetric signal without the need of combining separate stand-alone measurement results. In this study, isothermal crystallization experiments are used to discuss the benefits of this approach. This will lead to the recommendation that measuring the hardening effect in steady shear measurements at very low shear rates in a direct combined RheoDSC setup is the most reliable method to compile unambiguously a material specific hardening curve for semi-crystalline polymers. DOI : 10.3139/217.2374 En ligne : https://drive.google.com/file/d/1cnJN8rZnm6E-MZMtd51j4BzV5esbC1jN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9827 [article]

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Water permeation in coatings / E. Jalilian in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 6 (11/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 6 (11/2020) . - p. 1437–1445 Titre : Water permeation in coatings Type de document : texte imprimé Auteurs : E. Jalilian, Auteur ; H. Terryn, Auteur ; G. Van Assche, Auteur Année de publication : 2020 Article en page(s) : p. 1437–1445 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Anticorrosion Calorimétrie Caractérisation Gravimétrie (chimie analytique) Pénétration (physique) Perméation Revêtements Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : The objective of this work is to develop and evaluate experimental approaches with different analytical techniques to measure the permeability, diffusivity, and solubility of water in model coatings. These properties are of primary relevance in studies of coatings for corrosion protection. For water permeation measurements, setups were designed and prepared to facilitate measurements by microcalorimetry, gravimetry, and thermogravimetric analysis. For sorption measurements, films were prepared in various thicknesses to allow a proper analysis with Fourier-transform infrared spectroscopy in transmission mode and gravimetry. Both methods are successful in following water uptake kinetic curves, being complementary in film thickness ranges that can be analyzed. The validity of the permeabilities calculated from permeation measurements is compared to results from group contribution methods and reported values in the literature. Diffusivities were determined using data from the transient region in sorption and permeation measurements, as well as from the steady-state permeation rate and equilibrium solubility in permeation and sorption measurements, respectively. Note de contenu : - MATERIALS AND METHODS : Materials - Sorption measurements - Permeation measurements - RESULTS AND DISCUSSION : Materials - Sorption measurements - Permeation measurements DOI : https://doi.org/10.1007/s11998-020-00377-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00377-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34950 [article]

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