Preparation and Characterization of Spherical Polyimide Aerogel Microparticles

Kwon, Jinuk; Kim, Jin‐Young; Yoo, Taewon; Park, Dongmyung; Han, Haksoo

doi:10.1002/mame.201400010

Cited by 24 publications

(14 citation statements)

References 28 publications

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“…[ 7–9 ] Recently, organic polymeric aerogels such as polyurethanes and polyimides attracted scientist's attention due to their potential to achieve enhanced ductility over the inorganic counterparts. [ 10–14 ] Among the organic aerogels, only the polyimides were able to present the required high thermal stability of up to 400 °C. [ 13–15 ] Such high service temperature makes the polyimide aerogels a suitable candidate for firefighting insulation applications such as the insulation layer of Fire Approach and Fire Proximity firefighting gears with required heat resistance of 93 and 260 °C, respectively.…”

Section: Introductionmentioning

confidence: 99%

Double Dianhydride Backbone Polyimide Aerogels with Enhanced Thermal Insulation for High‐Temperature Applications

Mosanenzadeh

Alshrah

Saadatnia

et al. 2020

Macro Materials & Eng

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Aerogels owe their high thermal insulation and other unique properties to their nanostructure configuration. However, controlling the aerogels' morphology is always a scientific challenge. In this study, double dianhydride backbone (double backbone) polyimide aerogels with tailored nanostructure assembly are created for the first time. This is achieved by controlled polymerization reaction of oligomers with distinct dianhydride monomers. Combining the two oligomers through a controlled polymerization reaction is a successful strategy for tailoring the aerogels nanostructure assembly as well as other properties. The fabricated double backbone aerogel presents 40% reduced thermal conductivity of 19.7 mW mK−1 over previously studied polyimide aerogels along with the compression modulus of 1.64 MPa at a relatively low density of 0.068 g cm−3. Such low thermal conductivity is comparable with the inorganic counterparts. Light in weight and high thermally insulated polyimide aerogels with suitable mechanical properties and high service temperature are an appropriate replacement for current fireproof insulation materials.

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Section: Introductionmentioning

confidence: 99%

Double Dianhydride Backbone Polyimide Aerogels with Enhanced Thermal Insulation for High‐Temperature Applications

Mosanenzadeh

Alshrah

Saadatnia

et al. 2020

Macro Materials & Eng

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“…Previous researches on PI aerogels have tended to improve the mechanical strength and overcome the inherent brittleness by adding cross-linking agents and freeze-drying methods, which can construct continuous 3-dimensional structure to bear stress. [11][12][13] However, the improvement of mechanical properties is almost accompanied by the obvious increase of density and the deterioration of heat insulation performance. 14 Liu et al…”

Section: Introductionmentioning

confidence: 99%

SiC whiskers‐reinforced polyimide aerogel composites with robust compressive properties and efficient thermal insulation performance

Hou

Li²,

Luo

et al. 2020

J of Applied Polymer Sci

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Polyimide (PI) aerogels enable promising application in many fields but are always inhibited by their weak resistance to high temperature and low mechanical properties. Herein, novel PI aerogel composites with efficient heat insulation and high compressive performance are prepared by introducing Silicon carbide whiskers (SiCw) as reinforcement. The SiCw in aerogel function as shrinkage inhibitor and high temperature stabilizer. The addition of SiCw exhibits obvious enhancement and toughening effect, the compressive strength of the PI aerogel composites increases from 1.09 to 1.96 MPa. These PI aerogel composites also show enhanced high temperature stability. The as-prepared PI aerogel composites possess integrated properties of high-temperature resistance, low thermal conductivity, and high compressive strength, which can be the candidate for the application in aerospace.

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“…Regardless, the pore size distribution can also be verified by SEM images. The nitrogen adsorption method and mercury injection method have also been widely used to evaluate the multiscale pore size distribution of aerogel materials [ 31 , 32 , 33 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

Experimental Characterization of the Thermal Conductivity and Microstructure of Opacifier-Fiber-Aerogel Composite

Zhang

et al. 2018

Molecules

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Due to their high-porosity, nanoporous structure and pores, aerogel materials possess extremely low thermal conductivity and have broad potential in the thermal insulation field. Silica aerogel materials are widely used because of their low thermal conductivity and high temperature resistance. Pure silica aerogel is very fragile and nearly transparent to the infrared spectrum within 3–8 μm. Doping fibers and opacifiers can overcome these drawbacks. In this paper, the influences of opacifier type and content on the thermal conductivity of silica fiber mat-aerogel composite are experimentally studied using the transient plane source method. The thermal insulation performances are compared from 100 to 750 °C at constant pressure in nitrogen atmosphere among pure fiber mat, fiber mat-aerogel, 20% SiC-fiber mat-aerogel, 30% ZrO2-fiber mat-aerogel and 20% SiC + 30% ZrO2-fiber mat-aerogel. Fiber mat-aerogel doped with 20% SiC has the lowest thermal conductivity, 0.0792 W/m·K at 750 °C, which proves that the proper type and moderate content of opacifier dominates the low thermal conductivity. The pore size distribution indicates that the volume fraction of the micropore and mesopore is also the key factor for reducing the thermal conductivity of porous materials.

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Preparation and Characterization of Spherical Polyimide Aerogel Microparticles

Cited by 24 publications

References 28 publications

Double Dianhydride Backbone Polyimide Aerogels with Enhanced Thermal Insulation for High‐Temperature Applications

Double Dianhydride Backbone Polyimide Aerogels with Enhanced Thermal Insulation for High‐Temperature Applications

SiC whiskers‐reinforced polyimide aerogel composites with robust compressive properties and efficient thermal insulation performance

Experimental Characterization of the Thermal Conductivity and Microstructure of Opacifier-Fiber-Aerogel Composite

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