Fluorinated Pyridine Aryl Ether Polymers with Defined Microstructures, Diverse Architectures, and Tunable Thermal Properties
Bibliographic record
Abstract
By utilizing the unique regioselective nucleophilic aromatic substitution (SNAr) of pentafluoropyridine with bisphenols, a series of 4-substituted tetrafluoropyridine (TFP) aryl ether monomers were prepared in nearly quantitative yields from a facile, base-promoted methodology. Sequential regioselective SNAr of TFP monomers with bisphenols afforded linear amorphous, solution-processable fluorinated pyridine aryl ether polymers as well as networks. Room-temperature kinetic experiments using 19 F NMR revealed high-molecular-weight polymers with nearly quantitative conversions. By the nature of the bisphenol substitution and its electronic effects, the polymer microstructure was tuned for a broad range of glass transition temperatures for optically transparent materials. This work will provide insights into synthetic routes toward TFP monomers, step-growth polymerization kinetics, molecular weight determination, and thermal properties.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 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) | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".