Double‐Phase‐Networking Polyimide Hybrid Aerogel with Exceptional Dimensional Stability for Superior Thermal Protection System

Small, Journal Year: 2024, Volume and Issue: 20(44)

Published: July 2, 2024

Abstract Polyimide aerogels have been extensively used in thermal protection domain because they possess a combination of intrinsic characteristics and unique features polyimide. However, polyimide still suffer significant thermally induced shrinkage at temperatures above 200 °C, restricting their application high temperature. Here, novel “double‐phase‐networking” strategy is proposed for fabricating lightweight mechanically robust hybrid aerogel by forming silica–zirconia‐phase networking skeletons, which exceptional dimensional stability high‐temperature environments superior insulation. The rational mechanism responsible the formation double‐phase‐networking further explained, generally attributing to chemical crosslinking reactions supramolecular hydrogen bond interactions derived from main chains silane/zirconia precursor/sol. as‐prepared exhibit excellent (270 °C) (5.09% ± 0.16%), anti‐thermal‐shock properties, low conductivity. Moreover, hydrophobic treatment provides water resistance with contact angle 136.9°, suggestive moisture content 3.6% after exposure 70 °C 85% relative humidity 64 h. solution significantly enhancing insulation great supporting foundation high‐performance organic as materials aerospace.

Language: Английский

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Structurally resilient carbon nanofiber aerogels from aramid nanofibers for thermal insulation under extreme conditions

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 159507 - 159507

Published: Jan. 1, 2025

Language: Английский

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Preparing hydrophobic silica aerogels with superior thermal insulation and fire safety by introducing sepiolite

Construction and Building Materials, Journal Year: 2025, Volume and Issue: 461, P. 139905 - 139905

Published: Jan. 1, 2025

Language: Английский

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A flexible, thermal-insulating, and fire‐resistant bagasse-derived cellulose aerogel prepared via a refrigerator freezing combined ambient pressure drying technique

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 498, P. 155466 - 155466

Published: Sept. 3, 2024

Language: Английский

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Preparation and characterization of micro-cellular melamine foam supported SiO2 aerogel for building thermal insulation

Energy and Buildings, Journal Year: 2024, Volume and Issue: 320, P. 114617 - 114617

Published: Aug. 3, 2024

Language: Английский

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High‐Temperature Resistant Polyimide Aerogels With Extreme Condition Tolerance Constructed by In Situ Skeleton Encapsulation Growth

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 25, 2025

Abstract Polyimide aerogel (PIA) can enable to withstand the extreme conditions in a great measure due their exceptional thermal stability and excellent mechanical toughness properties derived from rigid‐ring structures, which are rather promising alternatives terms of high‐performance protection materials for aerospace field. However, PIA usually suffers poor dimensional at high‐temperature atmosphere, accordingly leading into degradation macroscopic features, eventually restricting extreme‐ambient applications. Here, an situ skeleton encapsulation growth strategy is proposed modulate networking construction pattern, namely forming binary organic–inorganic nature skeletons originated nanoscale structures encapsulated with polymethylsilsesquioxane. The resulting demonstrates superior (linear shrinkage down 1.11% even experiencing 300 °C 3000 s) despite facing heat flux shock, suggesting resistant ability depending upon Si‐O‐phase‐layer formation intrinsic strong chemical bonds polyimide chains. Further, aerogels own extreme‐condition tolerance when subjected shock cycling (−196 °C—300 °C), fantastic flame retardancy 1200 °C. This approach developing broadens applicability holds significant potential protection, particularly conditions.

Language: Английский

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Mechanically robust poly(urethane-imide) aerogels with excellent thermal insulation and sound absorption by ambient drying

Reactive and Functional Polymers, Journal Year: 2024, Volume and Issue: 201, P. 105944 - 105944

Published: May 24, 2024

Language: Английский

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Ultralow shrinkage polyimide hybrid aerogel composite enhanced with organic fibers for thermal protection

Journal of Applied Polymer Science, Journal Year: 2024, Volume and Issue: 141(32)

Published: May 23, 2024

Abstract Polyimide (PI) aerogels possess a rather potential in thermal protection material for aircraft, owing to their low conductivity, high stability, and bulk density. However, the large shrinkage of pure PI is still challenge complete preparation process. Herein, kind hybrid aerogel composite was prepared successfully by introducing polyurethane fiber as reinforcing agent. The could realize enhancement from micro/macroscopic perspective, ultimately ensuring ultralow rate 3.52%. Due inhibition characteristic, obtained achieved excellent insulation, especially retaining temperature 40.7°C despite hot surface reached up 150°C. Besides, lightweight low‐density, exceptional flame resistance, self‐extinguishing properties were reflected constructed, including outstanding hydrophobic feature (water contact angle 120°). may be used management aircraft great measure, illustrating feasible strategy fabricating PI‐based composites.

Language: Английский

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“Cocktail-like” double-layered polyimide/alumina composite aerogels via side-direction freezing method as designable high-temperature thermal insulations

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 157052 - 157052

Published: Oct. 1, 2024

Language: Английский

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Enhanced thermal insulation of polyimide aerogels in extreme environments tailored by rigid-flexible coupling synergy

Composites Communications, Journal Year: 2024, Volume and Issue: 53, P. 102225 - 102225

Published: Dec. 12, 2024

Language: Английский

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