TPU-based porous heterostructures by combined techniques / Alessandra Longo in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 4 (2022)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 4 (2022) . - p. 415-426 Titre : TPU-based porous heterostructures by combined techniques Type de document : texte imprimé Auteurs : Alessandra Longo, Auteur ; Deborah Giannetti, Auteur ; Daniele Tammaro, Auteur ; Salvatore Costanzo, Auteur ; Ernesto Di Maio, Auteur Année de publication : 2022 Article en page(s) : p. 415-426 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Calorimétrie Caractérisation Contraintes (mécanique) Essais dynamiques Hétérostructures Impression tridimensionnelle Masse volumique Morphologie (matériaux) Mousses plastiques Polyuréthanes Pression Rhéologie Température Thermogravimétrie Index. décimale : 668.4 Plastiques, vinyles Résumé : The production of thermoplastic polyurethane-based porous heterostructures combining physical foaming with fused deposition modeling is detailed in this contribution. The choice of combining these two techniques lies in the possibility of creating objects endowed with a dual-scale structure at millimeter scale by fused deposition modeling and at microscopic scale by gas foaming. Thermal stability and rheological properties of the neat polymer were studied prior to foaming to design a suitable processing protocol and three different combined techniques are proposed: pressure quench, temperature rise and direct 3D foam printing. Foam morphologies were evaluated by SEM and foamed samples were characterized by thermal and mechanical analyses to highlight the differences among the combined processing techniques. Samples foamed via pressure quench exhibit the highest degree of crystallinity and a uniform cell morphology, also resulting in the largest stiffness. The results presented in this contribution open up the possibility of producing objects with complex geometry and porosity architecture at the dual scale. Note de contenu : - MATERIALS AND METHODS : Materials - Samples preparation - Characterization - Processing methods - RESULTS : Rheological properties - Thermogravimetry - Morphologies - Density - Differential scanning calorimetry - Compression tests - Table 1 : Process parameters for the combined foaming processing methods - Table 2 : Densities of the samples under investigation DOI : https://doi.org/10.1515/ipp-2022-0026 En ligne : https://drive.google.com/file/d/14SiaJ8Y0pDQKi9ya2fwj2sG5jKoQQ1Qx/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37917 [article]

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