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Microcellular thermosetting polyurethane foams / C. Brondi in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 3 (07/2020)
[article]
Titre : Microcellular thermosetting polyurethane foams Type de document : texte imprimé Auteurs : C. Brondi, Auteur ; M. R. Di Caprio, Auteur ; Ernesto Di Maio, Auteur ; T. Mosciatti, Auteur ; S. Cavalca, Auteur ; V. Parenti, Auteur ; S. Iannace, Auteur Année de publication : 2020 Article en page(s) : p. 326-330 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Mousses microcellulaires
Mousses plastiques
Polyuréthanes
Procédés de fabricationIndex. décimale : 668.4 Plastiques, vinyles Résumé : Thermosetting polyurethane foams are nowadays produced with typical bubble size, d > 150 μm, with plenty of room for improvement towards the cellular structure refinement, to gain, among others, in the thermal insulation performances. We herein report a first example of a microcellular thermosetting polyurethane foam, i. e. with bubble size below 5 μm, produced via the gas foaming technology. In particular, high-pressure CO2, N2 and their mixtures were utilized as blowing agents: solubilized separately into the polymer precursors, they were brought into a supersaturated state by a pressure reduction to induce the bubble nucleation and growth. To achieve microcellular foams, we made use of a novel two-stage pressure reduction program, concurrent to the polymer curing. The first stage is a pressure quench O (10–2 s) from the saturation pressure to an intermediate pressure to induce the nucleation of a large amount of dense bubbles. The second stage is a slow O (102 s) further pressure decrease to ambient pressure, allowing for a slow bubble growth, designed to reach ambient pressure exactly when the curing reached completion. DOI : https://doi.org/10.3139/217.3936 En ligne : https://drive.google.com/file/d/1ElR0vxpReESyOoYTj3SwEYdYLtC9p09x/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34497
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 3 (07/2020) . - p. 326-330[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21818 - Périodique Bibliothèque principale Documentaires Disponible Pizza foaming - a delicious study from Naples / Emilia di Lorenzo in PLASTICS INSIGHTS, Vol. 113, N° 6 (2023)
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Titre : Pizza foaming - a delicious study from Naples : High-pressure foaming of thermosets Type de document : texte imprimé Auteurs : Emilia di Lorenzo, Auteur ; Pietro Renato Avallone, Auteur ; Paolo Laccarino, Auteur ; Rossana Pasquino, Auteur ; Nino Grizzuti, Auteur ; Ernesto Di Maio, Auteur Année de publication : 2023 Article en page(s) : p. 42-45 Langues : Anglais (eng) Catégories : Moussage (chimie)
Mousses plastiques
Polyuréthanes
ThermodurcissablesIndex. décimale : 668.4 Plastiques, vinyles Résumé : At the University of Naples Federico II scientists tested a new foaming method on a special thermosetting polymer : pizza dough. This is a very complex viscoelastic heterogeneous polymeric mixture that forms bubbles in several hours thanks to the presence of the biochemical blowing agent yeast. The dough cures in the oven at 300 to 400 °C in a few tens of seconds. Possibility to concomitantly foam and bake, reducing the overall timing, is explored through comparison with the much faster polyurethane foaming. Note de contenu : - Manufacture of Polyurethane Foams
- Gas Foaming for Higher Insulating Performances
- Separation of the Two Key Foaming Stages
- The Case of Pizza Dough
- Fig. 1 : A new foaming method was tested on a special thermosetting polymer : pizza dough
- Fig. 2 : The specially designed autoclave for testing a full-size pizza, 25 cm in diameter
- Fig. 3 : Measuring results of the pizza test
- Fig. 4 : First tests were successfully carried out with laboratory equipment on small dough balls of 1 cm diameter, cooked and foamed in 4 min at 137 °C and pressures up to 6 bar
- Fig. 5 : Comparison between standard PU and high-pressure PUEn ligne : https://drive.google.com/file/d/18PxMDBZzKiwxGMsuRLnGdqLjjxDmvL4R/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39993
in PLASTICS INSIGHTS > Vol. 113, N° 6 (2023) . - p. 42-45[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24151 - Périodique Bibliothèque principale Documentaires Disponible TPU-based porous heterostructures by combined techniques / Alessandra Longo in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 4 (2022)
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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
ThermogravimétrieIndex. 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 investigationDOI : 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37917
in INTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 4 (2022) . - p. 415-426[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23739 - Périodique Bibliothèque principale Documentaires Disponible