Poly (vinyl alcohol) assisted regulation of aramid nanofibers aerogel structure for thermal insulation and adsorption

Li, Jiaoyang; Huang, Jizhen; Li, Hua; Lu, Zhaoqing

doi:10.1016/j.micromeso.2022.111997

Cited by 20 publications

(23 citation statements)

References 48 publications

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“…A certain amount of PVA was vigorously stirred for 2 h at 90°C, then the ANF aqueous solution was mixed with PVA and CNF stirred evenly. The preparation of CNF/PVA/ANF composite gel and aerogel were similar with Li et al 6,10 …”

Section: Methodssupporting

confidence: 71%

“…Therefore, composition and freezing mode directly determine the shape of secondary pores in ANF-based nanofiber aerogel. 6 In addition, due to the synergistic effect of flexible PVA and semi-rigid CNF, ANF aerogel forms a layered ordered pore structure with ultra-light properties and excellent mechanical properties, which is similar to the anisotropic structure of natural wood. 16 Combined with the regulatory structure of CNF and PVA, ANF aerogel can acquire the characteristics of anisotropy and layered porous structure, and PVA can be used as a cross-linking agent, which can enter into the pores of ANF and CNF and serve as the skeleton of aerogel to enhance its layered structure.…”

Section: Resultsmentioning

confidence: 98%

“…When the ice crystals sublimate form layered pores and polygonal secondary pores. Therefore, composition and freezing mode directly determine the shape of secondary pores in ANF‐based nanofiber aerogel 6 . In addition, due to the synergistic effect of flexible PVA and semi‐rigid CNF, ANF aerogel forms a layered ordered pore structure with ultra‐light properties and excellent mechanical properties, which is similar to the anisotropic structure of natural wood 16 .…”

Section: Resultsmentioning

confidence: 99%

“…Thus, they cannot be used to insulate bodies with complex shapes. Polymer aerogels offer an alternative to inorganic aerogels 6 …”

Section: Introductionmentioning

confidence: 99%

“…Polymer aerogels offer an alternative to inorganic aerogels. 6 However, research on aerogels, particularly polymerbased aerogels, over the past few decades has been mainly focused on monolithic aerogels. 7 Reports on how to improve the application of polymer-based aerogel by regulating its microstructure are rare.…”

Section: Introductionmentioning

confidence: 99%

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‘Rigid‐soft’ synergistic effects to improve the microstructure and superflexibility properties of aramid nanofiber aerogel

Huang

et al. 2022

J of Applied Polymer Sci

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Designing aramid nanofiber (ANF) aerogel with excellent microstructure and high thermal insulation property is benefit for applications in integrated thermal management system. To obtain a structurally controllable ANF‐based aerogel, the cellulose nanofiber (CNF) and poly (vinyl alcohol) (PVA) were ‘stiff–soft’ synergistic to improve the microstructure. The cobweb like structures distributed in the honeycomb layered pores of the CNF/PVA/ANF composite aerogel which was conducive to the performance and application of composite aerogel. The resulting CNF1/PVA1/ANF composite aerogels are highly porous (99.12%) and tiny volume shrinkage (4.65%), leading to excellent thermal insulation performance (26.83 mW/m·K). The ‘stiff–soft’ feature endows the composite aerogels high flexibility as well as large compression strength. These favorable multi‐features make the CNF/PVA/ANF composite aerogels ideal advanced material for aerospace, industrial, and commercial applications.

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Section: Methodssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

“…Thus, they cannot be used to insulate bodies with complex shapes. Polymer aerogels offer an alternative to inorganic aerogels 6 …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

‘Rigid‐soft’ synergistic effects to improve the microstructure and superflexibility properties of aramid nanofiber aerogel

Huang

et al. 2022

J of Applied Polymer Sci

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Thermally Insulating and Moisture‐Resilient Foams Based on Upcycled Aramid Nanofibers and Nanocellulose

Di,

Schiele,

Hadi

et al. 2023

Advanced Materials

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Low‐density foams and aerogels based on upcycled and bio‐based nanofibers and additives are promising alternatives to fossil‐based thermal insulation materials. We have prepared super‐insulating foams from upcycled acid‐treated aramid nanofibers (upANFA) obtained from Kevlar® yarn and tempo‐oxidized cellulose nanofibers (CNF) from wood. The ice‐templated hybrid upANFA/CNF‐based foams with an upANFA content of up to 40 wt.% displayed high thermal stability and a very low thermal conductivity of 18–23 mW m−1 K−1 perpendicular to the aligned nanofibrils over a wide relative humidity (RH) range of 20% to 80%. The thermal conductivity of the hybrid upANFA/CNF foams was found to decrease with increasing upANFA content (5‐20 wt.%). The super‐insulating properties of the CNF‐upANFA hybrid foams were related to the low density of the foams and the strong interfacial phonon scattering between the very thin and partially branched upANFA and CNF in the hybrid foam walls. Defibrillated nanofibers from textiles are not limited to Kevlar®, and this study could hopefully inspire efforts to upcycle textile waste into high‐performance products.This article is protected by copyright. All rights reserved

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Poly Methyl Meta Acrylic/Electrospun PVA Nanofibers Composites for Denture Base Applications

Mohamed,

Kadhim,

Obaid

2024

Current Trends in Civil Engineering and Engineering Sciences 2024, Vol 2

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Poly (vinyl alcohol) assisted regulation of aramid nanofibers aerogel structure for thermal insulation and adsorption

Cited by 20 publications

References 48 publications

‘Rigid‐soft’ synergistic effects to improve the microstructure and superflexibility properties of aramid nanofiber aerogel

‘Rigid‐soft’ synergistic effects to improve the microstructure and superflexibility properties of aramid nanofiber aerogel

Thermally Insulating and Moisture‐Resilient Foams Based on Upcycled Aramid Nanofibers and Nanocellulose

Poly Methyl Meta Acrylic/Electrospun PVA Nanofibers Composites for Denture Base Applications

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