Synthesis and characterization of novel phenolic resin/silicone hybrid aerogel composites with enhanced thermal, mechanical and ablative properties

Yin, Rongying; Cheng, Haiming; Hong, Changqing; Zhang, Xinghong

doi:10.1016/j.compositesa.2017.07.012

Cited by 102 publications

(35 citation statements)

References 48 publications

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“…It is easy to notice that the intensity of characteristic peaks of 1106 cm ‐1 that belong to C−N stretching of the Mannich bridges and Si‐O‐Si asymmetric stretching increases gradually with the growth of Si content in samples. Besides, the absorption at 461 cm −1 belonging to the Si‐O‐Si bending stretching appears in PBO/SiO 2 ‐1, ‐2, ‐3 aerogels but absence in the PBO aerogels as expected 39–40 …”

Section: Resultsmentioning

confidence: 52%

“… 12–13 The peak of 3429 cm ‐1 in PBO aerogels is more evident than that in PBO/SiO 2 aerogels, indicating the structure of Si‐O‐C(Ph) is formed by the reaction between phenolic O‐H and Si‐OH, which is in accord with the appearance of Si‐O‐C(Ph) peak at 957 cm ‐1 in all PBO/SiO 2 aerogels except PBO aerogels 38–39 . Meanwhile, the characteristic peak at 1226 cm ‐1 implies that the Si‐OH grafts the O−H in PBO by Si‐O‐C bridges, also part of Si‐OH self‐polycondensed to generate Si‐O‐Si 39–41 . It is easy to notice that the intensity of characteristic peaks of 1106 cm ‐1 that belong to C−N stretching of the Mannich bridges and Si‐O‐Si asymmetric stretching increases gradually with the growth of Si content in samples.…”

Section: Resultsmentioning

confidence: 69%

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In situ co‐polymerization of high‐performance polybenzoxazine/silica aerogels for flame‐retardancy and thermal insulation

Xiao

Cai

et al. 2020

J of Applied Polymer Sci

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Materials with high‐performance thermal insulation and excellent flame‐resistance are incredibly desirable for energy conservation and fire safety. In this study, a novel hybrid nanostructure network polybenzoxazine/silica (PBO/SiO2) aerogels were fabricated through facile in situ co‐polymerization sol‐gel methods with ambient pressure drying using benzoxazine (BO) monomers and SiO2 sol as reaction source, N, N‐dimethylformamide (DMF) as the solvent and hydrochloric acid (HCl) as the catalyst. The hybrid nanostructure network was retained by polymerization–induced nanoscale phase separation of PBO and SiO2. The resulting PBO/SiO2 aerogels exhibited finer microstructure, lower density (0.18 g/cm3), thermal conductivity (0.031 W/m·K), and better flame‐resistance in comparison with PBO aerogels. They demonstrated an excellent compressive strength of 0.81 to 1.12 MPa at 10% deformation. The remarkable improvement in thermal insulation and flame‐resistance of PBO/SiO2 aerogels could be attributed to the combined effects of finer microstructure and formation of SiO2 that was “in‐situ” interpenetrated and interacted with silanols (Si‐OH) in the PBO network during the combustion process. The successful synthesis of PBO/SiO2 aerogels highlights the possibility of fabricating a novel high‐performance thermal insulation and excellent flame‐resistance used for energy‐efficient buildings.

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Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 69%

In situ co‐polymerization of high‐performance polybenzoxazine/silica aerogels for flame‐retardancy and thermal insulation

Xiao

Cai

et al. 2020

J of Applied Polymer Sci

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“…The compressive strength of BANF aerogel reached 825 kPa at a compressive strain of 80%, which is about five times greater than the values measured for graphene‐, carbon nanotube‐, and cellulose‐based aerogels 84–87 . Compressive strength normalized by the density is 102 MPa/cm 3 ·g for BANF aerogels, which is also much larger than that of other aerogels; even the strongest hybrid aerogels reported the state‐of‐the‐art in the field 29,38,86,88–100 (Figure 5D) while demonstrating excellent flexibility (Figure S6). These combinations of mechanical properties can also be attributed to the cartilage‐like percolated network structure.…”

Section: Resultsmentioning

confidence: 81%

Biomimetic nanoporous aerogels from branched aramid nanofibers combining high heat insulation and compressive strength

et al. 2021

SmartMat

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Materials combining efficient thermal insulation and high mechanical properties are needed in many areas of technology. Various aerogels provide a convenient design framework for thermal insulators, but they are often brittle. Furthermore, the spectrum of advanced properties is constantly expanding while requirements to the degree of control of the three-dimensional gel-forming network is constantly increasing. Here, we report on biomimetic aramid nanofibers aerogels with the structure replicating articular cartilage, prepared by supercritical drying of 3D networks held together by hydrogen bonds. Owing to the branching morphology of the nanofibers, the three-dimensional nanoscale networks with extensive percolation and high interconnectivity can be obtained. The aerogels showed high porosity with an average open pore size of 21.5 nm and correspondingly low specific density of 0.0081 g/cm 3. The aerogels also possess a high compressive strength of 825 kPa at a strain of 80%. Due to the unique aramid chemistry of the parent nanofibers, aramid aerogels combine low thermal conductivity of 0.026 W/m•K with high thermal stability up to 530°C, which is unusually high for polymeric and composite materials of any type, opening a broad range of applications from electronics to space travel.

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“…According to previous literature, carbon bonded carbon fiber composites (CBCF) have attracted much attention due to their low density and low thermal conductivity, and are considered a promising candidate for thermal insulation. CBCF is commonly prepared by vacuum or pressure filtration followed the pyrolysis method using chopped carbon fibers and phenolic resin (PR) as raw materials [2,3]. Although numerous efforts have been made to research CBCF composites, the intrinsic problems of CBCF composites severely restrict them for practical application, namely weak mechanical and poor oxidation resistance under high-temperature conditions [4].…”

Section: Introductionmentioning

confidence: 99%

Strong and Thermostable Boron-Containing Phenolic Resin-Derived Carbon Modified Three-Dimensional Needled Carbon Fiber Reinforced Silicon Oxycarbide Composites with Tunable High-Performance Microwave Absorption Properties

Sun

2020

Applied Sciences

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This paper focuses on the preparation of boron-containing phenolic resin (BPR)-derived carbon modified three-dimensional (3D) needled carbon fiber reinforced silicon oxycarbide (SiOC) composites through a simple precursor infiltration and pyrolysis process (PIP), and the influence of PIP cycle numbers on the microstructure, mechanical, high-temperature oxidation resistance. The electromagnetic wave (EMW) absorption properties of the composites were investigated for the first time. The pyrolysis temperature played an important role in the structural evolution of the SiOC precursor, as temperatures above 1400 °C would cause phase separation of the SiOC and the formation of silicon carbide (SiC), silica (SiO2), and carbon. The density and compressive strength of the composites increased as the PIP cycle number increased: the value for the sample with 3 PIP cycles was 0.77 g/cm3, 7.18 ± 1.92 MPa in XY direction and 9.01 ± 1.25 MPa in Z direction, respectively. This composite presented excellent high-temperature oxidation resistance and thermal stability properties with weight retention above 95% up to 1000 °C both under air and Ar atmosphere. The minimal reflection loss (RLmin) value and the widest effective absorption bandwidth (EAB) value of as-prepared composites was −24.31 dB and 4.9 GHz under the optimization condition for the sample with 3 PIP cycles. The above results indicate that our BPR-derived carbon modified 3D needled carbon fiber reinforced SiOC composites could be considered as a promising material for practical applications.

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Synthesis and characterization of novel phenolic resin/silicone hybrid aerogel composites with enhanced thermal, mechanical and ablative properties

Cited by 102 publications

References 48 publications

In situ co‐polymerization of high‐performance polybenzoxazine/silica aerogels for flame‐retardancy and thermal insulation

In situ co‐polymerization of high‐performance polybenzoxazine/silica aerogels for flame‐retardancy and thermal insulation

Biomimetic nanoporous aerogels from branched aramid nanofibers combining high heat insulation and compressive strength

Strong and Thermostable Boron-Containing Phenolic Resin-Derived Carbon Modified Three-Dimensional Needled Carbon Fiber Reinforced Silicon Oxycarbide Composites with Tunable High-Performance Microwave Absorption Properties

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