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Article

Synthesis and Characterization of High-Performing Sulfur-Free Tannin Foams

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Forest Products Technology & Timber Constructions Department, Salzburg University of Applied Sciences, Marktstrasse 136a, 5431 Kuchl, Austria
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Salzburg Center for Smart Materials, Jakob-Haringer-Strasse 2a, 5020 Salzburg, Austria
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Physics Department, University of Calabria, Via Pietro Bucci, cubo 31C, 87036 Rende (CS), Italy
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Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14-km 163,5 in AREA Science Park, 34149 Trieste, Basovizza, Italy
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Land, Environment, Agriculture and Forestry Department, University of Padua, Viale dell’Università 16, 35020 Legnaro (PD), Italy
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Author to whom correspondence should be addressed.
Polymers 2020, 12(3), 564; https://doi.org/10.3390/polym12030564
Received: 3 February 2020 / Revised: 27 February 2020 / Accepted: 1 March 2020 / Published: 4 March 2020
(This article belongs to the Special Issue State-of-the-Art Polymer Science and Technology in Italy (2019,2020))
Tannin foams are green lightweight materials that have attracted industrial interest for the manufacturing of sandwich panels for insulation purposes. However, the dimensions of the cells and the presence of sulfur in the formulation developed until now have discouraged their upscaling. In this work, we present the synthesis and the characterization of the more promising small cell and sulfur-free materials. It was observed that, with respect to standard ones, foams catalyzed with nitric acid present similar physical properties and more phenolic character, which favors the absorption of ionic pollutants. Conversely, the foams blown with aliphatic solvents and surfactants present smaller pores, and higher mechanical and insulating properties, without affecting the chemical properties or the heating value. The combined foam produced with nitric acid as a catalyst and petroleum ether as a blowing agent result in sulfur-free and small cell material with overall improved features. These foams have been produced at 30 × 30 × 3 cm3, with high homogeneity and, to date, they represent the most suitable formulation for industrial upscaling. View Full-Text
Keywords: polyphenols; flavonoids; furanics; sulphur; bio-polymers; pentane; heating value polyphenols; flavonoids; furanics; sulphur; bio-polymers; pentane; heating value
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MDPI and ACS Style

Eckardt, J.; Neubauer, J.; Sepperer, T.; Donato, S.; Zanetti, M.; Cefarin, N.; Vaccari, L.; Lippert, M.; Wind, M.; Schnabel, T.; Petutschnigg, A.; Tondi, G. Synthesis and Characterization of High-Performing Sulfur-Free Tannin Foams. Polymers 2020, 12, 564. https://doi.org/10.3390/polym12030564

AMA Style

Eckardt J, Neubauer J, Sepperer T, Donato S, Zanetti M, Cefarin N, Vaccari L, Lippert M, Wind M, Schnabel T, Petutschnigg A, Tondi G. Synthesis and Characterization of High-Performing Sulfur-Free Tannin Foams. Polymers. 2020; 12(3):564. https://doi.org/10.3390/polym12030564

Chicago/Turabian Style

Eckardt, Jonas, Jonas Neubauer, Thomas Sepperer, Sandro Donato, Michela Zanetti, Nicola Cefarin, Lisa Vaccari, Marcel Lippert, Matthias Wind, Thomas Schnabel, Alexander Petutschnigg, and Gianluca Tondi. 2020. "Synthesis and Characterization of High-Performing Sulfur-Free Tannin Foams" Polymers 12, no. 3: 564. https://doi.org/10.3390/polym12030564

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