High Glass Transition of Fluorinated Polyimides Derived from 4‐(3,4‐Difluorophenyl)‐2,6‐bis(4‐aminophenyl)pyridine
Why this work is in the frame
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Bibliographic record
Abstract
Abstract A series of novel fluorinated polyimides ( PIs ) were prepared from 4‐(3,4‐difluorophenyl)‐2,6‐bis(4‐aminophenyl)pyridine ( FPAP ) and commercial aromatic dianhydrides via conventional two‐step thermal imidization technique. The structure of the monomer was confirmed by FT‐IR , NMR , and mass spectrometry. All of the obtained PIs were studied with FT‐IR , TGA , DSC , WAXD and contact angles analysis. These results showed that polymer materials presented excellent thermal properties with the glass transition temperature ( T g ) in the range of 336—434 °C, as well as T 5% , and T 10% decomposition temperature ranges of 543—600 °C and 562—622 °C in a nitrogen atmosphere, respectively. Moreover, they presented excellent mechanical properties with tensile strengths of 68—91 MPa , elongation at break of 5.6%—10.2%, and young's modulus of 1.8—2.4 GPa . Furthermore, they showed outstanding hydrophobicity with the contact angle in the range of 90.5°—96.6°, and the results of WAXD indicated all of the polymers presented amorphous structure.
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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 | 0.001 |
| 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 | 0.001 |
| Open science | 0.001 | 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