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Ice-Template Crosslinked PVA Aerogels Modified with Tannic Acid and Sodium Alginate

With the commitment to reducing environmental impact, bio-based and biodegradable aerogels may be one approach when looking for greener solutions with similar attributes to current foam-like materials. This study aimed to enhance the mechanical, thermal, and flame-retardant behavior of poly(vinyl al...

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Autores principales: De la Cruz, Lucía G., Abt, Tobias, León, Noel, Wang, Liang, Sánchez-Soto, Miguel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9321210/
https://www.ncbi.nlm.nih.gov/pubmed/35877504
http://dx.doi.org/10.3390/gels8070419
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author De la Cruz, Lucía G.
Abt, Tobias
León, Noel
Wang, Liang
Sánchez-Soto, Miguel
author_facet De la Cruz, Lucía G.
Abt, Tobias
León, Noel
Wang, Liang
Sánchez-Soto, Miguel
author_sort De la Cruz, Lucía G.
collection PubMed
description With the commitment to reducing environmental impact, bio-based and biodegradable aerogels may be one approach when looking for greener solutions with similar attributes to current foam-like materials. This study aimed to enhance the mechanical, thermal, and flame-retardant behavior of poly(vinyl alcohol) (PVA) aerogels by adding sodium alginate (SA) and tannic acid (TA). Aerogels were obtained by freeze-drying and post-ion crosslinking through calcium chloride (CaCl(2)) and boric acid (H(3)BO(3)) solutions. The incorporation of TA and SA enhanced the PVA aerogel’s mechanical properties, as shown by their high compressive specific moduli, reaching up to a six-fold increase after crosslinking and drying. The PVA/TA/SA aerogels presented a thermal conductivity of 0.043 to 0.046 W/m·K, while crosslinked ones showed higher values (0.049 to 0.060 W/m·K). Under TGA pyrolytic conditions, char layer formation reduced the thermal degradation rate of samples. After crosslinking, a seven-fold decrease in the thermal degradation rate was observed, confirming the high thermal stability of the formed foams. Regarding flammability, aerogels were tested through cone calorimetry. PVA/TA/SA aerogels showed a significant drop in the main parameters, such as the heat release rate (HRR) and the fire growth (FIGRA). The ion crosslinking resulted in a further reduction, confirming the improvement in the fire resistance of the modified compositions.
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spelling pubmed-93212102022-07-27 Ice-Template Crosslinked PVA Aerogels Modified with Tannic Acid and Sodium Alginate De la Cruz, Lucía G. Abt, Tobias León, Noel Wang, Liang Sánchez-Soto, Miguel Gels Article With the commitment to reducing environmental impact, bio-based and biodegradable aerogels may be one approach when looking for greener solutions with similar attributes to current foam-like materials. This study aimed to enhance the mechanical, thermal, and flame-retardant behavior of poly(vinyl alcohol) (PVA) aerogels by adding sodium alginate (SA) and tannic acid (TA). Aerogels were obtained by freeze-drying and post-ion crosslinking through calcium chloride (CaCl(2)) and boric acid (H(3)BO(3)) solutions. The incorporation of TA and SA enhanced the PVA aerogel’s mechanical properties, as shown by their high compressive specific moduli, reaching up to a six-fold increase after crosslinking and drying. The PVA/TA/SA aerogels presented a thermal conductivity of 0.043 to 0.046 W/m·K, while crosslinked ones showed higher values (0.049 to 0.060 W/m·K). Under TGA pyrolytic conditions, char layer formation reduced the thermal degradation rate of samples. After crosslinking, a seven-fold decrease in the thermal degradation rate was observed, confirming the high thermal stability of the formed foams. Regarding flammability, aerogels were tested through cone calorimetry. PVA/TA/SA aerogels showed a significant drop in the main parameters, such as the heat release rate (HRR) and the fire growth (FIGRA). The ion crosslinking resulted in a further reduction, confirming the improvement in the fire resistance of the modified compositions. MDPI 2022-07-05 /pmc/articles/PMC9321210/ /pubmed/35877504 http://dx.doi.org/10.3390/gels8070419 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
De la Cruz, Lucía G.
Abt, Tobias
León, Noel
Wang, Liang
Sánchez-Soto, Miguel
Ice-Template Crosslinked PVA Aerogels Modified with Tannic Acid and Sodium Alginate
title Ice-Template Crosslinked PVA Aerogels Modified with Tannic Acid and Sodium Alginate
title_full Ice-Template Crosslinked PVA Aerogels Modified with Tannic Acid and Sodium Alginate
title_fullStr Ice-Template Crosslinked PVA Aerogels Modified with Tannic Acid and Sodium Alginate
title_full_unstemmed Ice-Template Crosslinked PVA Aerogels Modified with Tannic Acid and Sodium Alginate
title_short Ice-Template Crosslinked PVA Aerogels Modified with Tannic Acid and Sodium Alginate
title_sort ice-template crosslinked pva aerogels modified with tannic acid and sodium alginate
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9321210/
https://www.ncbi.nlm.nih.gov/pubmed/35877504
http://dx.doi.org/10.3390/gels8070419
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