Polyvinyl alcohol composite aerogel with remarkable flame retardancy, chemical durability and self-cleaning property

Zhang, Qiaoran; Wang, Xiaoyang; Tao, Xiaojun; Li, Zhiwei; Li, Xiaohong; Zhang, Zhijun

doi:10.1016/j.coco.2019.07.003

Cited by 47 publications

(16 citation statements)

References 35 publications

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“…It may also be related to the high skeleton strength caused by the strong adhesion of PVA. 42 High magnification showed that the network structure of the aerogel provided a good space for the in situ generation of MH. MH was embedded and semi-embedded in the pore network of the aerogel and supported the skeleton of the aerogel carrier ( Fig.…”

Section: Resultsmentioning

confidence: 99%

In situ nanoarchitectonics of magnesium hydroxide particles for property regulation of carboxymethyl cellulose/poly(vinyl alcohol) aerogels

Xia

Guo

et al. 2021

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

In situ nanoarchitectonics of magnesium hydroxide particles for property regulation of carboxymethyl cellulose/poly(vinyl alcohol) aerogels

Xia

Guo

et al. 2021

RSC Adv.

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“…It is well known that

increases with moisture content. The aerogel moisture absorption can be minimized by applying a hydrophobic coating to the aerogel surfaces [ 34 , 35 ].…”

Section: Resultsmentioning

confidence: 99%

“…It is well known that λ increases with moisture content. The aerogel moisture absorption can be minimized by applying a hydrophobic coating to the aerogel surfaces [34,35]. In the uncrosslinked aerogels, pure PVA (P5 sample) showed the lowest values (λ = 0.030 W/m•K) and the lowest apparent density (ρ app = 0.075 ± 0.005 g/cm 3 ), whereas P5T3A3 presented the highest conductivity (λ = 0.046 W/m•K) as well as the highest density (ρ app = 0.144 ± 0.009 g/cm 3 ).…”

Section: Thermal Conductivitymentioning

confidence: 99%

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

Cruz

Abt

León

et al. 2022

Gels

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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.

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“…During combustion, the amide group and other nitrogen-containing groups in LSW decompose endothermically, producing an extensively large amount of nonflammable gases such as HCN, NH 3 , CO 2 , and HCNO to prevent combustion. , Simultaneously, LSW is rapidly carbonized during combustion to form a carbon layer, which prevents air from entering, and further inhibits the progress of combustion. Figure b illustrates the comparative analysis of the fire safety and mechanical strength of some biomass-based aerogels, such as PVA/boron nitride (BNNS) and ammonium polyphosphate (APP), PVOH/clay, PVA/cellulose/APP, PVA/melamine–formaldehyde (MF), PVA/clay, and cellulose/graphene oxide (GO) . A desirable aerogel should be located close to the upper right corner displaying both mechanical robustness and reliable fire safety.…”

Section: Resultsmentioning

confidence: 99%

Leather Solid Waste/Poly(vinyl alcohol)/Polyaniline Aerogel with Mechanical Robustness, Flame Retardancy, and Enhanced Electromagnetic Interference Shielding

Zhang

Zeng

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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Renewable biobased aerogels display a promising potential to fulfill the surging demand in various industrial sectors. However, its inherent low mechanical robustness, flammability, and lack of functionality are still huge obstacles in its practical application. Herein, a novel integrated leather solid waste (LSW)/ poly(vinyl alcohol) (PVA)/polyaniline (PANI) aerogel with high mechanical robustness, flame retardancy, and electromagnetic interference (EMI) shielding performance was successfully prepared. Amino carboxyl groups in LSW could be effectively exposed by solid-state shear milling (S 3 M) technology to form strong hydrogen-bond interactions with the PVA molecular chains. This led to a change in the compressive strength and the temperature of the initial dimensional change to 15.6 MPa and 112.7 °C at a thickness of 2.5 cm, respectively. Moreover, LSW contains a large number of N elements, which ensures a nitrogen-based flame-retardant mechanism and increase in the limit oxygen index value of LSW/PVA aerogel to 32.0% at a thickness of 2.5 mm. Notably, by the cyclic coating method, a conductive PANI layer could be polymerized on the surface of LSW/PVA aerogel, which led to the construction of a sandwich structure with impressive EMI shielding capability. The EMI shielding effectiveness (SE) reached more than 40 dB, and the specific shielding effectiveness (SSE) reached 73.0 dB cm 3 g −1 . The inherent dipoles in collagen fibers and the conductive PANI synergistically produced an internal multiple reflection and absorption mechanism. The comprehensive performance of LSW/PVA/PANI aerogel not only demonstrates a new strategy to recycle LSW in a more value-added way but also sheds some more light on the development of biomass aerogels with high-performance, environmentally friendly, and cost-effective properties.

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Polyvinyl alcohol composite aerogel with remarkable flame retardancy, chemical durability and self-cleaning property

Cited by 47 publications

References 35 publications

In situ nanoarchitectonics of magnesium hydroxide particles for property regulation of carboxymethyl cellulose/poly(vinyl alcohol) aerogels

In situ nanoarchitectonics of magnesium hydroxide particles for property regulation of carboxymethyl cellulose/poly(vinyl alcohol) aerogels

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

Leather Solid Waste/Poly(vinyl alcohol)/Polyaniline Aerogel with Mechanical Robustness, Flame Retardancy, and Enhanced Electromagnetic Interference Shielding

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