Characterization, thermal and mechanical properties and hydrophobicity of resorcinol-furfural/silicone hybrid aerogels synthesized by ambient-pressure drying

Cheng, Haiming; Xue, Huafei; Hong, Changqing; Zhang, Xinghong

doi:10.1039/c6ra09557g

Cited by 25 publications

(4 citation statements)

References 69 publications

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“…[7][8][9] Generally speaking, silica and alumina aerogels exhibited stable nano-porous network structures, and are attractive candidates for thermal insulation. 10 However, owing to their brittle nature and crystallizationinduced pulverization behavior, conventional oxide aerogels oen suffer from serious strength degradation and structural collapse under large thermal gradients or extended hightemperature exposure. 11 Compared with silica aerogels, alumina aerogels possess better mechanical and chemical stability, endowing them with great potential applications.…”

Section: Introductionmentioning

confidence: 99%

Robust monolithic polymer(resorcinol-formaldehyde) reinforced alumina aerogel composites with mutually interpenetrating networks

Zhong

Shao

et al. 2019

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Robust monolithic polymer(resorcinol-formaldehyde) reinforced alumina aerogel composites with mutually interpenetrating networks

Zhong

Shao

et al. 2019

RSC Adv.

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“…Moreover, as shown in Figure b, the compressive modulus of cPBO-20 aerogels was up to 84.68 MPa, which was superior to that of the P( o AI-a) aerogels and markedly higher than other aerogel materials, such as polyimide aerogels, porous aramid aerogels, chitosan aerogels, and hybrid aerogels . This means that because of their superior mechanical properties, cPBO aerogels can be used as structural materials.…”

Section: Resultsmentioning

confidence: 91%

Preparing Multifunctional High-Performance Cross-Linked Polybenzoxazole Aerogels from Polybenzoxazine

Wang

Zhan

et al. 2021

ACS Appl. Polym. Mater.

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Polybenzoxazole (PBO) aerogels have such valuable properties as excellent thermal and chemical stability, good fire resistance, and electronic transmission. However, the current processes to produce these aerogels tend to be complex and inefficient, and they are difficult to process into complex shapes. In this paper, we report a strategy to prepare cross-linked PBO (cPBO) aerogels by the polybenzoxazine. The polybenzoxazine aerogels were obtained first and then converted into cPBO aerogels through heat treatment. The prepared cPBO aerogels not only had low thermal conductivity (0.030 to 0.039 W m −1 K −1 ) but also possessed excellent mechanical properties (compressive modulus of 84.68 MPa) and low dielectric properties (1.51 at 1 kHz). These are attributable to the intrinsic structure of cPBO and the high porosity of aerogels in general. Because small-molecule ortho-functionalized benzoxazine has good solubility and can be used to prepare homogeneous solutions with various solid contents, this preparation strategy avoids the defect of directly using PBO resin, which has poor solubility and poor processability. Moreover, the pores of the cross-linked polybenzoxazine aerogels can be retained to the greatest extent during heat treatment. The preparation process is simple, efficient, and has a good application prospect.

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“…Additionally, we compared the compressive strength of CF/CS composites with other similar materials, as shown in Figure 8e,f, and detailed data are presented in Table S3 (Supporting Information). [21,32,[55][56][57][58][59][60][61][62] The compressive strength of CF/CS composites showed a significant advantage compared with other similar materials. To intuitively display the compression resistance of CF/CS composites, an adult with a weight of 70 kg could stand directly on the top of S2, as illustrated in Figure 8g.…”

Section: Mechanical Properties Of Cf/cs Compositesmentioning

confidence: 98%

Multifunctional Carbon Fiber Reinforced C/SiOC Aerogel Composites for Efficient Electromagnetic Wave Absorption, Thermal Insulation, and Flame Retardancy

Yang,

Dong,

Cui

et al. 2023

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Carbon fiber composites have great application prospects as a potential electromagnetic (EM) wave‐absorbing material, yet it remains extremely challenging to integrate multiple functions of EM wave absorption, mechanical strength, thermal insulation, and flame retardancy. Herein, a novel carbon fiber reinforced C/SiOC aerogel (CF/CS) composite is successfully prepared by sol‐gel impregnation combined with an ambient drying process for the first time. The density of the obtained CF/CS composites can be controlled just by changing sol‐gel impregnation cycles (original carbon fiber felt (S0), and samples with one (S1) and two (S2) impregnation cycles are 0.249, 0.324, and 0.402 g cm−3, respectively), allowing for efficient tuning of their properties. Remarkably, S2 displays excellent microwave absorption properties, with an optimal reflection loss of ‐65.45 dB, which is significantly improved than S0 (‐10.90 dB). Simultaneously, compared with S0 (0.75 and 0.30 MPa in the x/y and z directions), the mechanical performance of S2 is dramatically improved with a maximum compressive strength of 10.37 and 4.93 MPa in the x/y and z directions, respectively. Moreover, CF/CS composites show superior thermal insulation capability than S0 and obtain good flame‐retardant properties. This work provides valuable guidance and inspiration for the development of multifunctional EM wave absorbers.

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Characterization, thermal and mechanical properties and hydrophobicity of resorcinol-furfural/silicone hybrid aerogels synthesized by ambient-pressure drying

Abstract: In this work, a resorcinol-furfural/silicone hybrid aerogels is synthesized by ambient pressure drying with good thermal, mechanical properties and hydrophobicity.

Cited by 25 publications

References 69 publications

Robust monolithic polymer(resorcinol-formaldehyde) reinforced alumina aerogel composites with mutually interpenetrating networks

Robust monolithic polymer(resorcinol-formaldehyde) reinforced alumina aerogel composites with mutually interpenetrating networks

Preparing Multifunctional High-Performance Cross-Linked Polybenzoxazole Aerogels from Polybenzoxazine

Multifunctional Carbon Fiber Reinforced C/SiOC Aerogel Composites for Efficient Electromagnetic Wave Absorption, Thermal Insulation, and Flame Retardancy

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