Reversible sacrificial hydrogen bonds enhanced ultra-high strength polybenzoxazine aerogel for thermal insulation

Long, Xin; Tang, Pengkai; Zhou, Lichun; Chen, Wei; Ren, Shi‐Bin; Qiu, Yuhong; Sui, Luxi; Wei, Xiongbang; Liao, Jiaxuan

doi:10.1016/j.apsusc.2022.156004

Cited by 23 publications

(7 citation statements)

References 38 publications

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“…At a fracture strain of 82.63%, the maximum compression stress of H2F-SA is as high as 26.40 MPa (Figure b). In terms of the compression specific strength and fracture strain, H2F-SA is superior to other aerogels with excellent mechanical properties (Figure c), ,,− emphasizing its excellent mechanical resistance to compression. Also, with this special structure, H2F-SA also achieves the coexistence of high strength and excellent processability.…”

Section: Resultsmentioning

confidence: 97%

SiO₂ Nanostructure-Based Aerogels with High Strength and Deformability for Thermal Insulation

Long

Wei

et al. 2023

ACS Appl. Nano Mater.

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Conventional SiO 2 aerogels composed of 0-dimensional nanoparticles do not have large-scale compression, tensile, and shear deformation capabilities, and the poor mechanical properties hinder their further development and application. We report a scalable strategy to construct the nanoporous network of a SiO 2 aerogel by alternately linking octa(aminophenyl)-T8-POSS and hexaphthalic acid. The resulting SiO 2 aerogel exhibits high strengths (compression, tensile and shear strengths are 26.4, 9.16, and 8.31 MPa, respectively), excellent deformabilities (fracture compression, tensile, and shear strains are 82.63%, 57.81% and 108.02%, respectively), flexbile processability and good structural stability (only 1.7% plastic deformation occurs after 100 load−unload cycles at a large compression strain of 70%). Also, the mesoporous interconnected nanoskeleton with high porosity and the composition of fully hydrophobic groups also give the aerogel low thermal conductivities (0.02854 W/(m K) at 25 °C and 0.04638 W/(m K) at 300 °C) and superhydrophobic properties (hydrophobic angle 160°and saturated mass moisture absorption rate about 0.375%). The combination of these excellent properties ensures that the aerogel can be used as an efficient thermal insulation material for extreme environments, such as those where comprehensive mechanical and hydrophobic properties are strictly required.

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Section: Resultsmentioning

confidence: 97%

SiO₂ Nanostructure-Based Aerogels with High Strength and Deformability for Thermal Insulation

Long

Wei

et al. 2023

ACS Appl. Nano Mater.

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“…S3 for structure). The benzoxazine monomer 2 was prepared in the laboratory using a method described in the literature 14 . The other materials were purchased from suppliers.…”

Section: Main Materialsmentioning

confidence: 99%

“…In order to further improve the mechanical properties of aerogels, researchers have attempted to prepare aerogels using polymers with rigid structures 14 .Yunyun Xiao et al successfully prepared aerogels with excellent mechanical properties (at 70% strain, with stresses up to 15 MPa) and ame retardant and thermal insulation properties of composites 15 . However, the thermal conductivity of the aerogel was relatively high, reaching 0.069 W/(m•K).…”

Section: Introductionmentioning

confidence: 99%

Double Cross-Linking Strategy for High-Performance, Thermally Stable Aerogels: A Breakthrough in Extreme Environment Applications

Ren,

Liu,

Long

et al. 2024

Preprint

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High-performance insulating aerogels are optimal thermal protection materials for extreme environments such as aerospace. However, the large-scale application of traditional inorganic aerogels is constrained by their brittleness, hygroscopicity, and complex process conditions. Furthermore, the temperature resistance of organic aerogels is limited, despite their high mechanical strength and low-cost advantages. In this study, a composite aerogel material with a double cross-linking structure and strong interactions was successfully prepared by acid-catalysed ring-opening and supercritical drying processes using methyltrimethoxysilane as the silicon source, combined with phenylaminoated polybenzoxazine monomers and carboxylated cellulose nanofibers as the reinforcement materials, and introducing fumed hydrophobic silica. The material displays excellent mechanical properties, with a compressive strength of up to 34 MPa, and is capable of withstanding more than 500 ml of water without significant deformation. Furthermore, the aerogel exhibits a low density (0.175–0.232 g/cm³), good hydrophobicity (contact angle of 142°), and excellent thermal stability. This study presents a novel approach to the development of thermal protection materials that combine high strength and excellent thermal insulation properties.

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“…Polybenzoxazine, as a relatively new member of highperformance thermosetting resins, is attracting more and more attention from academia and industrial communities due to its high molecular design flexibility, high thermal resistance, high modulus, flame retardance, good dielectric properties, and low dimensional change during curing. [1][2][3][4][5][6][7][8][9][10] It shows good potential in automobile industry, rail traffic, electronic materials, and aerospace. [11][12][13][14][15] However, the phenolic Mannich bridge structure generated by ring-opening polymerization of benzoxazine monomers favors the formation of intramolecular six-membered hydrogen bonding, the strong six-membered hydrogen bonding would hinder the chain-propagation and cross-linking, and the low crosslinking density would further hamper the toughness of polybenzoxazine.…”

Section: Introductionmentioning

confidence: 99%

“…Polybenzoxazine, as a relatively new member of high‐performance thermosetting resins, is attracting more and more attention from academia and industrial communities due to its high molecular design flexibility, high thermal resistance, high modulus, flame retardance, good dielectric properties, and low dimensional change during curing 1‐10 . It shows good potential in automobile industry, rail traffic, electronic materials, and aerospace 11‐15 .…”

Section: Introductionmentioning

confidence: 99%

Polybenzoxazine modified by phenolphthalein‐based poly(arylene ether nitrile): Better thermal, mechanical, and dielectric properties

Zhang,

He,

Liu

et al. 2023

J of Applied Polymer Sci

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Polybenzoxazine, as a ring‐opening polymerized thermosetting resin, suffers from poor toughness. Blending with thermoplastic polymers is a convenient and efficient approach to improve the toughness, however, at the cost of thermal and mechanical properties. In this work, a high‐performance thermoplastic polymer poly(arylene ether nitrile) (PEN) with Tg higher than polybenzoxazine's was used to modify the polybenzoxazine poly(BA‐a). It was found that the PEN improved the mechanical properties, with elongation at break value increased from 1.75% to 3.11% and tensile strength increased from 17.99 to 32.19 MPa when 30 wt% of PEN was introduced. Moreover, due to the better thermal resistance and thermal stability of PEN, Tg of the composites increased from 205.6 to 220.5°C, chary yield at 800°C (Yc) increased from 28% to 46.4%. It was also noted that homogeneous blend was formed at low loading of PEN but phase separation occurred at high content of PEN, with PEN forming isolated spheres. Due to the voids formed between continuous phase and the isolated PEN spheres, the dielectric constant decreased from 3.84 to 3.30 at 1 MHz.

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Reversible sacrificial hydrogen bonds enhanced ultra-high strength polybenzoxazine aerogel for thermal insulation

Cited by 23 publications

References 38 publications

SiO₂ Nanostructure-Based Aerogels with High Strength and Deformability for Thermal Insulation

SiO₂ Nanostructure-Based Aerogels with High Strength and Deformability for Thermal Insulation

Double Cross-Linking Strategy for High-Performance, Thermally Stable Aerogels: A Breakthrough in Extreme Environment Applications

Polybenzoxazine modified by phenolphthalein‐based poly(arylene ether nitrile): Better thermal, mechanical, and dielectric properties

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Reversible sacrificial hydrogen bonds enhanced ultra-high strength polybenzoxazine aerogel for thermal insulation

Cited by 23 publications

References 38 publications

SiO2 Nanostructure-Based Aerogels with High Strength and Deformability for Thermal Insulation

SiO2 Nanostructure-Based Aerogels with High Strength and Deformability for Thermal Insulation

Double Cross-Linking Strategy for High-Performance, Thermally Stable Aerogels: A Breakthrough in Extreme Environment Applications

Polybenzoxazine modified by phenolphthalein‐based poly(arylene ether nitrile): Better thermal, mechanical, and dielectric properties

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Product

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About

SiO₂ Nanostructure-Based Aerogels with High Strength and Deformability for Thermal Insulation

SiO₂ Nanostructure-Based Aerogels with High Strength and Deformability for Thermal Insulation