Degradation mechanisms of CF/PPS, CF/PEI, and CF/PEEK under combined UV radiation and condensation
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
From 1990 to 2020, the total weight of composites integrated in airplane structures increased from 5 to 50% contributing to reduce fuel consumption and CO 2 emission. However, environmental weathering conditions alter the stability and durability of load-bearing composite components. Three carbon fibre-reinforced high-performance thermoplastic composites — polyphenylene sulphide (PPS), polyether imide (PEI), and polyether ether ketone (PEEK) — used in aviation are exposed to combined ultraviolet radiation (UV), humidity and temperature, following ASTM D4329-21 for up to 28 days. To support characterisation, the corresponding neat polymer films of PPS, PEI, and PEEK were aged under the same conditions. The polymer matrix of the composites degraded following two distinct mechanisms. CF/PPS predominantly cross-linked, which resulted in increased brittleness, reduced crystallinity and increased in tensile strength after 28 days. In contrast, CF/PEI and CF/PEEK underwent primarily chain scission, leading to decreased T g (PEI), increased crystallinity (PEEK), and reduced tensile strength (CF/PEEK and CF/PEI) after exposure.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 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) | 0.000 | 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