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

Abstract

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.

Novel, flexible, and transparent thin film polyimide aerogels with enhanced thermal insulation and high service temperature

“…12,13 Organic-based aerogels, such as polyimide (PI), [14][15][16][17][18] polyamide, 19,20 and polyurethane (PU), 21,22 can be promising alternatives, as they exhibit more ductility and flexibility. In this context, PI aerogels with the thermal stability of up to 400 1C 14,23,24 are the only promising candidate for high service temperature.…”

Polyimide aerogels with novel bimodal micro and nano porous structure assembly for airborne nano filtering applications

“…9,[15][16][17] Moreover, the polyimide aerogels presented a higher service temperature of up to 400 C over the other organic aerogels. [18][19][20] Furthermore, moisture resistant polyimide aerogels are reported by using varying chemicals and specic monomers, such as dimethylbenzidine (DMBZ). [21][22][23][24] These together suggested the high capability of polyimide aerogels to be used as airborne nanoparticle lters in different industrial applications with a wide range of environmental conditions and operating temperatures.…”

Hierarchical Cellular Poly(m‐phenylene isophthalamide) with High Flame Retardancy, Mechanical Robustness, and Heat Resistance at Extreme Situation

“…The 15.4%PMIA had a modulus of 14.2 MPa, which was higher than that of reported PI cellular materials with similar density, such as PI/CNT foams (>2.5 MPa) [34] and PI aerogels (2.40 MPa). [35] Their specific compressive strength (14.1 kN m -1 kg -1 ) at ε = 60% of 15.4%PMIA was higher than that of reported foams, such as PI/graphene foam (2.6 kN m -1 kg -1 ), [36] poly(p-phenylene terephthalamide) aerogel (6.6 kN m -1 kg -1 ), [28] poly urethaneimide foam (3.1-3.9 kN m -1 kg -1 ), [37,38] and polystyrene foam (3.9 kN m -1 kg -1 ). [39] Cyclic compression tests under 10% and 30% strain were conducted to the mechanical resilience of foams (Figure 4c,d).…”