Fabrication of Polyimide Aerogels Cross-Linked by a Cost-Effective Amine-Functionalized Hyperbranched Polysiloxane (NH<sub>2</sub>–HBPSi)
Why this work is in the frame
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Bibliographic record
Abstract
Polyimide (PI) aerogels were prepared from anhydride end-capped polyamic acid oligomers cross-linked by a low-cost lab-made amine-functionalized hyperbranched polysiloxane macromer (NH2–HBPSi). NH2–HBPSi was synthesized via the hydrolysis–condensation reaction between phenyltrimethoxysilane, tetraethoxysilane, and γ-aminopropylmethyldiethoxysilane, which are all cheap commercially available silane-coupling agents. To determine the effects of the NH2–HBPSi cross-linker on the formation and properties of aerogels, two different PI oligomers, synthesized from relatively flexible 4,4′-oxidianiline and rigid-rod 2,2′-dimethylbenzidine, were investigated. The resulting PI aerogels showed comparable properties with the triamine cross-linked PI aerogels, such as low densities (0.12 to 0.20 g cm–3), high BET specific surface areas (279 to 460 m2 g–1), low thermal conductivities (29–32 mW m–1 K–1), and excellent mechanical and thermal properties across the range of NH2–HBPSi cross-linker concentrations used (2.5 to 12.5 wt %). Moreover, the thermal insulation, dielectric, and CO2 uptake performances were also investigated, demonstrating the broad range of potential applications for these multifunctional cross-linked PI aerogels. Considering the low-cost and facile synthesis for this NH2–HBPSi macromer cross-linking agent, we anticipate that this work can overcome the drawbacks of expensive conventional PI cross-linkers and offer a simple approach to produce low-cost PI aerogels at scale.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it