Cargando…

Nanocellulose Removes the Need for Chemical Crosslinking in Tannin-Based Rigid Foams and Enhances Their Strength and Fire Retardancy

[Image: see text] 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...

Descripción completa

Detalles Bibliográficos
Autores principales: Missio, André Luiz, Otoni, Caio G., Zhao, Bin, Beaumont, Marco, Khakalo, Alexey, Kämäräinen, Tero, Silva, Silvia H. F., Mattos, Bruno D., Rojas, Orlando J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9364407/
https://www.ncbi.nlm.nih.gov/pubmed/35966391
http://dx.doi.org/10.1021/acssuschemeng.2c02678
_version_ 1784765140834451456
author Missio, André Luiz
Otoni, Caio G.
Zhao, Bin
Beaumont, Marco
Khakalo, Alexey
Kämäräinen, Tero
Silva, Silvia H. F.
Mattos, Bruno D.
Rojas, Orlando J.
author_facet Missio, André Luiz
Otoni, Caio G.
Zhao, Bin
Beaumont, Marco
Khakalo, Alexey
Kämäräinen, Tero
Silva, Silvia H. F.
Mattos, Bruno D.
Rojas, Orlando J.
author_sort Missio, André Luiz
collection PubMed
description [Image: see text] 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.
format Online
Article
Text
id pubmed-9364407
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher American Chemical Society
record_format MEDLINE/PubMed
spelling pubmed-93644072022-08-11 Nanocellulose Removes the Need for Chemical Crosslinking in Tannin-Based Rigid Foams and Enhances Their Strength and Fire Retardancy Missio, André Luiz Otoni, Caio G. Zhao, Bin Beaumont, Marco Khakalo, Alexey Kämäräinen, Tero Silva, Silvia H. F. Mattos, Bruno D. Rojas, Orlando J. ACS Sustain Chem Eng [Image: see text] 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. American Chemical Society 2022-07-25 2022-08-08 /pmc/articles/PMC9364407/ /pubmed/35966391 http://dx.doi.org/10.1021/acssuschemeng.2c02678 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Missio, André Luiz
Otoni, Caio G.
Zhao, Bin
Beaumont, Marco
Khakalo, Alexey
Kämäräinen, Tero
Silva, Silvia H. F.
Mattos, Bruno D.
Rojas, Orlando J.
Nanocellulose Removes the Need for Chemical Crosslinking in Tannin-Based Rigid Foams and Enhances Their Strength and Fire Retardancy
title Nanocellulose Removes the Need for Chemical Crosslinking in Tannin-Based Rigid Foams and Enhances Their Strength and Fire Retardancy
title_full Nanocellulose Removes the Need for Chemical Crosslinking in Tannin-Based Rigid Foams and Enhances Their Strength and Fire Retardancy
title_fullStr Nanocellulose Removes the Need for Chemical Crosslinking in Tannin-Based Rigid Foams and Enhances Their Strength and Fire Retardancy
title_full_unstemmed Nanocellulose Removes the Need for Chemical Crosslinking in Tannin-Based Rigid Foams and Enhances Their Strength and Fire Retardancy
title_short Nanocellulose Removes the Need for Chemical Crosslinking in Tannin-Based Rigid Foams and Enhances Their Strength and Fire Retardancy
title_sort nanocellulose removes the need for chemical crosslinking in tannin-based rigid foams and enhances their strength and fire retardancy
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9364407/
https://www.ncbi.nlm.nih.gov/pubmed/35966391
http://dx.doi.org/10.1021/acssuschemeng.2c02678
work_keys_str_mv AT missioandreluiz nanocelluloseremovestheneedforchemicalcrosslinkingintanninbasedrigidfoamsandenhancestheirstrengthandfireretardancy
AT otonicaiog nanocelluloseremovestheneedforchemicalcrosslinkingintanninbasedrigidfoamsandenhancestheirstrengthandfireretardancy
AT zhaobin nanocelluloseremovestheneedforchemicalcrosslinkingintanninbasedrigidfoamsandenhancestheirstrengthandfireretardancy
AT beaumontmarco nanocelluloseremovestheneedforchemicalcrosslinkingintanninbasedrigidfoamsandenhancestheirstrengthandfireretardancy
AT khakaloalexey nanocelluloseremovestheneedforchemicalcrosslinkingintanninbasedrigidfoamsandenhancestheirstrengthandfireretardancy
AT kamarainentero nanocelluloseremovestheneedforchemicalcrosslinkingintanninbasedrigidfoamsandenhancestheirstrengthandfireretardancy
AT silvasilviahf nanocelluloseremovestheneedforchemicalcrosslinkingintanninbasedrigidfoamsandenhancestheirstrengthandfireretardancy
AT mattosbrunod nanocelluloseremovestheneedforchemicalcrosslinkingintanninbasedrigidfoamsandenhancestheirstrengthandfireretardancy
AT rojasorlandoj nanocelluloseremovestheneedforchemicalcrosslinkingintanninbasedrigidfoamsandenhancestheirstrengthandfireretardancy