Nanocellulose Removes the Need for Chemical Crosslinking in Tannin-Based Rigid Foams and Enhances Their Strength and Fire Retardancy
Missio AL, Otoni CG, Zhao B, Beaumont M, Khakalo A, Kämäräinen T, Silva SH, Mattos BD, Rojas OJ (2022)
Publication Type: Journal article
Publication year: 2022
Journal
Book Volume: 10
Pages Range: 10303-10310
Journal Issue: 31
DOI: 10.1021/acssuschemeng.2c02678
Abstract
Thermal insulation and fire protection are two of the most critical features affecting energy efficiency and safety in built environments. Together with the associated environmental footprint, there is a strong need to consider new insulation materials. Tannin rigid foams have been proposed as viable and sustainable alternatives to expanded polyurethanes, traditionally used in building enveloping. Tannin foams structure result from polymerization with furfuryl alcohol via self-expanding. We further introduce cellulose nanofibrils (CNFs) as a reinforcing agent that eliminates the need for chemical crosslinking during foam formation. CNF forms highly entangled and interconnected nanonetworks, at solid fractions as low as 0.1 wt %, enabling the formation of foams that are ca. 30% stronger and ca. 25% lighter compared to those produced with formaldehyde, currently known as one of the best performers in chemically coupling tannin and furfuryl alcohol. Compared to the those chemically crosslinked, our CNF-reinforced tannin foams display higher thermal degradation temperature (peak shifted upward, by 30-50 °C) and fire resistance (40% decrease in mass loss). Furthermore, we demonstrate partially hydrophobized CNF to tailor the foam microstructure and derived physical-mechanical properties. In sum, green and sustainable foams, stronger, lighter, and more resistant to fire are demonstrated compared to those produced by formaldehyde crosslinking.
Authors with CRIS profile
Involved external institutions
Federal University of Pelotas / Universidade Federal de Pelotas (UFPEL)
Brazil (BR)
Universidade Federal de São Carlos (UFSCar) / Federal University of São Carlos
Brazil (BR)
Aalto University Espoo
Finland (FI)
Universität für Bodenkultur Wien (BOKU) / University of Natural Resources and Life Sciences, Vienna
Austria (AT)
VTT Technical Research Centre of Finland
Finland (FI)
Brazil (BR)
Universidade Federal de São Carlos (UFSCar) / Federal University of São Carlos
Brazil (BR)
Aalto University Espoo
Finland (FI)
Universität für Bodenkultur Wien (BOKU) / University of Natural Resources and Life Sciences, Vienna
Austria (AT)
VTT Technical Research Centre of Finland
Finland (FI)
How to cite
APA:
Missio, A.L., Otoni, C.G., Zhao, B., Beaumont, M., Khakalo, A., Kämäräinen, T.,... Rojas, O.J. (2022). Nanocellulose Removes the Need for Chemical Crosslinking in Tannin-Based Rigid Foams and Enhances Their Strength and Fire Retardancy. ACS Sustainable Chemistry & Engineering, 10(31), 10303-10310. https://doi.org/10.1021/acssuschemeng.2c02678
MLA:
Missio, André Luiz, et al. "Nanocellulose Removes the Need for Chemical Crosslinking in Tannin-Based Rigid Foams and Enhances Their Strength and Fire Retardancy." ACS Sustainable Chemistry & Engineering 10.31 (2022): 10303-10310.
BibTeX: Download