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Sustainable Sheep Wool/Soy Protein Biocomposites for Sound Absorption

The wool fibers of the Latxa sheep breed were combined with a soy protein isolate (SPI) matrix to develop sustainable biocomposites with acoustic properties, adding value to Latxa sheep wool, which is currently considered a residue. Samples with 7, 10, 15, and 20 wt % wool were prepared by freeze dr...

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Autores principales: Urdanpilleta, Marta, Leceta, Itsaso, Guerrero, Pedro, de la Caba, Koro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9740274/
https://www.ncbi.nlm.nih.gov/pubmed/36501630
http://dx.doi.org/10.3390/polym14235231
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author Urdanpilleta, Marta
Leceta, Itsaso
Guerrero, Pedro
de la Caba, Koro
author_facet Urdanpilleta, Marta
Leceta, Itsaso
Guerrero, Pedro
de la Caba, Koro
author_sort Urdanpilleta, Marta
collection PubMed
description The wool fibers of the Latxa sheep breed were combined with a soy protein isolate (SPI) matrix to develop sustainable biocomposites with acoustic properties, adding value to Latxa sheep wool, which is currently considered a residue. Samples with 7, 10, 15, and 20 wt % wool were prepared by freeze drying in order to develop porous structures, as shown by SEM analysis. Additionally, XRD analysis provided the evidence of a change toward a more amorphous structure with the incorporation of wool fibers due to the interactions between the soy protein and keratin present in wool fibers, as shown by the relative intensity changes in the FTIR bands. The biocomposites were analyzed in a Kundt’s tube to obtain their sound absorption coefficient at normal incidence. The results showed an acoustic absorption coefficient that well-surpassed 0.9 for frequencies above 1000 Hz. This performance is comparable to that of the conventional synthetic materials present in the market and, thus, sheep wool/SPI biocomposites are suitable to be used as acoustic absorbers in the building industry, highlighting the potential of replacing not only synthetic fibers but also synthetic polymers, with natural materials to enhance the sustainability of the building sector.
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spelling pubmed-97402742022-12-11 Sustainable Sheep Wool/Soy Protein Biocomposites for Sound Absorption Urdanpilleta, Marta Leceta, Itsaso Guerrero, Pedro de la Caba, Koro Polymers (Basel) Article The wool fibers of the Latxa sheep breed were combined with a soy protein isolate (SPI) matrix to develop sustainable biocomposites with acoustic properties, adding value to Latxa sheep wool, which is currently considered a residue. Samples with 7, 10, 15, and 20 wt % wool were prepared by freeze drying in order to develop porous structures, as shown by SEM analysis. Additionally, XRD analysis provided the evidence of a change toward a more amorphous structure with the incorporation of wool fibers due to the interactions between the soy protein and keratin present in wool fibers, as shown by the relative intensity changes in the FTIR bands. The biocomposites were analyzed in a Kundt’s tube to obtain their sound absorption coefficient at normal incidence. The results showed an acoustic absorption coefficient that well-surpassed 0.9 for frequencies above 1000 Hz. This performance is comparable to that of the conventional synthetic materials present in the market and, thus, sheep wool/SPI biocomposites are suitable to be used as acoustic absorbers in the building industry, highlighting the potential of replacing not only synthetic fibers but also synthetic polymers, with natural materials to enhance the sustainability of the building sector. MDPI 2022-12-01 /pmc/articles/PMC9740274/ /pubmed/36501630 http://dx.doi.org/10.3390/polym14235231 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Urdanpilleta, Marta
Leceta, Itsaso
Guerrero, Pedro
de la Caba, Koro
Sustainable Sheep Wool/Soy Protein Biocomposites for Sound Absorption
title Sustainable Sheep Wool/Soy Protein Biocomposites for Sound Absorption
title_full Sustainable Sheep Wool/Soy Protein Biocomposites for Sound Absorption
title_fullStr Sustainable Sheep Wool/Soy Protein Biocomposites for Sound Absorption
title_full_unstemmed Sustainable Sheep Wool/Soy Protein Biocomposites for Sound Absorption
title_short Sustainable Sheep Wool/Soy Protein Biocomposites for Sound Absorption
title_sort sustainable sheep wool/soy protein biocomposites for sound absorption
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9740274/
https://www.ncbi.nlm.nih.gov/pubmed/36501630
http://dx.doi.org/10.3390/polym14235231
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