Identifying variations in cross-linked epoxies / Kiersten M. Smith in ADHESION - ADHESIVES + SEALANTS, Vol. 19, N° 3/2022 (2022)  

[article]  inADHESION - ADHESIVES + SEALANTS > Vol. 19, N° 3/2022 (2022) . - p. 18-22 Titre : Identifying variations in cross-linked epoxies Type de document : texte imprimé Auteurs : Kiersten M. Smith, Auteur ; Thomas D. Lazzara, Auteur ; Raymond H. Fernando, Auteur Année de publication : 2022 Article en page(s) : p. 18-22 Langues : Multilingue (mul) Catégories : Adhésifs -- Propriétés mécaniques Adhésifs -- Propriétés thermiques Analyse mécanique dynamique Epoxydes Humidité -- Absorption Réticulation (polymérisation) Index. décimale : 668.3 Adhésifs et produits semblables Résumé : The thermal and mechanical properties of an epoxy resin are derived from the structure and chemistry of its cross-linked network. Dynamic mechanical analysis can be used to measure transition temperatures of epoxies, including the primary transition : the glass transition temperature. Secondary transitions can provide additional insights into the structure property of epoxies. Note de contenu : - Materials and methods - Thermomechanical evaluation of an epoxy - Epoxy transition temperatures measured by DMA - Effect of temperature on primary and secondary transitions - Reversible solvent absorption - Table 1 : Some commercially available epoxies tested (purchased at online retailer in pre-packaged cartridges or small bottle products) - Fig. 1 : Thermomechanical analysis of a type A (left) and B epoxies (right). Type B epoxies have secondary transitions - Fig. 2 : Type B epoxies have secondary transitions, which are apparent when applying peak deconvolution techniques (Igor Pro software used for data processing) - Fig. 3 : The type A epoxy (ID5, Table 1) was mixed at different ratios to demonstrate that the primary transition changes with A:B ratio. Schematic representation of a cross-linked network, from bottome to top : excess part A (resin) to excess part B (hardener) - Fig. 4 : A type B epoxy was exposed at different temperatures showing that the secondary transition peak eventually merges with the primary transition peak - Fig. 5 : Epoxies of type A and type B exposed to boiling water for 1 h to evaluate if moisture absorption can be detected by DMA measurements En ligne : https://drive.google.com/file/d/10T9KnsKTwYgXKQXugJX-IevwhT9pewis/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38007 [article]

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