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Article

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

1
Centre Català del Plàstic, Universitat Politècnica de Catalunya Barcelona Tech (EEBE-UPC), Av. d’Eduard Maristany, 16, 08019 Barcelona, Spain
2
Key Laboratory of Advanced Textiles Composites of Ministry of Education, Tiangong University, Binshui West Road 399, Xiqing District, Tianjin 300387, China
*
Author to whom correspondence should be addressed.
Academic Editor: Richard G. Weiss
Gels 2022, 8(7), 419; https://doi.org/10.3390/gels8070419
Received: 8 June 2022 / Revised: 25 June 2022 / Accepted: 2 July 2022 / Published: 5 July 2022
(This article belongs to the Special Issue Current Research and Technological Advances on Aerogels)
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 (CaCl2) and boric acid (H3BO3) 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. View Full-Text
Keywords: aerogel; tannic acid; fire resistance; crosslinking; lyophilization aerogel; tannic acid; fire resistance; crosslinking; lyophilization
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    Link: https://doi.org/10.5281/zenodo.6699900
    Description: Table S1: Aerogel compositions. Figure S1: Aerogel monoliths for (a) Fire testing and (b) the rest of the characterizations. Figure S2:TA effect on the microstructure of (a) P5T2A3 Vs. (b) P5T3A3 aerogels. Figure S3: FTIR comparison of all the aerogels compositions. Figure S4: Thermal degradation behavior of (a) uncrosslinked and (b) crosslinked aerogels. Figure S5: HRR curves of (a) uncrosslinked and (b) crosslinked PVA/TA/SA aerogels. Video S1: P5 aerogel during vertical burning. Video S2: P5T3A3 uncrosslinked aerogel during vertical burning. Video S3: Self-extinguished performance of P5T3A3 crosslinked aerogel (part 1). Video S4: Self-extinguished performance of P5T3A3 crosslinked aerogel (part 2).
MDPI and ACS Style

De la Cruz, L.G.; Abt, T.; León, N.; Wang, L.; Sánchez-Soto, M. Ice-Template Crosslinked PVA Aerogels Modified with Tannic Acid and Sodium Alginate. Gels 2022, 8, 419. https://doi.org/10.3390/gels8070419

AMA Style

De la Cruz LG, Abt T, León N, Wang L, Sánchez-Soto M. Ice-Template Crosslinked PVA Aerogels Modified with Tannic Acid and Sodium Alginate. Gels. 2022; 8(7):419. https://doi.org/10.3390/gels8070419

Chicago/Turabian Style

De la Cruz, Lucía G., Tobias Abt, Noel León, Liang Wang, and Miguel Sánchez-Soto. 2022. "Ice-Template Crosslinked PVA Aerogels Modified with Tannic Acid and Sodium Alginate" Gels 8, no. 7: 419. https://doi.org/10.3390/gels8070419

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