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Polymers 2018, 10(10), 1102;

Sustainable, Low Flammability, Mechanically-Strong Poly(vinyl alcohol) Aerogels

Department of Macromolecular Science & Engineering, Case Western Reserve University, Cleveland, OH 44106-7202, USA
Authors to whom correspondence should be addressed.
Received: 24 September 2018 / Revised: 2 October 2018 / Accepted: 2 October 2018 / Published: 5 October 2018
(This article belongs to the Special Issue Polymer and Composite Aerogels)
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Poly(vinyl alcohol) (PVA), tannic acid (TA) and sodium hydroxide (NaOH) were used to prepare low-flammability, mechanically-strong aerogels via an environmentally-friendly freeze-drying method. Because of the strong interaction between TA and PVA through hydrogen bonds, PVA/TA/NaOH aerogels exhibited compressive moduli as high as 12.7 MPa, 20 times that of the control PVA aerogel. The microstructure of the aerogels in this study showed that the addition of NaOH disrupted the typical “card of house” aerogel structure, while the samples with TA showed a stereoscopic uniform structure. The thermal stabilities of aerogels were tested by thermogravimetric analysis, showing both a decrease on the onset of decomposition temperature, and a reduction in decomposition rate after initial char formation. The peak heat release rate and total heat release, as measured by cone calorimetry, dropped by 69% and 54%, respectively, after adding TA and NaOH. View Full-Text
Keywords: aerogels; poly(vinyl alcohol); flammability; tannic acid aerogels; poly(vinyl alcohol); flammability; tannic acid

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Cheng, Z.; DeGracia, K.; Schiraldi, D.A. Sustainable, Low Flammability, Mechanically-Strong Poly(vinyl alcohol) Aerogels. Polymers 2018, 10, 1102.

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