The First Example of a Poly(arylimidazole) by Polycondensation of AB-type Monomers: Control of Molecular Mass by End-Capping, and Functionalization to Poly(arylimidazolium)s
Bibliographic record
Abstract
In this work, the first AB-type primary-chain poly(arylimidazole) (AB-PAI) homopolymers were synthesized by Debus-Radziszewski polycondensation. Control of the number-average molecular mass ( M̅ n ) by ab initio stoichiometry of a monofunctional end-cap provides the first corroborating evidence for this polycondensation proceeding by Carothers’ Step-Growth mechanism. Quaternization of imidazole units in AB-PAI yields statistical poly(arylimidazolium) (AB-PAIm) ionenes. Steric protection of the electrophilic imidazolium C2 is encoded in the AB-type monomer. Exceptionally harsh alkaline conditions are required to quantify degradation of the sterically protected AB-PAIm derivative (in 40 wt % NaOD at 80 °C, 20% loss of imidazolium units is observed by NMR after 72 h). All the AB-PAI and the AB-PAIm are thermally stable up to 250 °C in air. The sterically encumbered, polycationic poly(2-[2,6-dimethylphenyl]-1,3-dimethyl-5-phenylimidazolium) hydroxide (IEC (OH) = 2.08 mmol g –1 ) is a transparent red glass that can be solvated by polar organic solvents and is insoluble in water and aqueous alkali metal hydroxides.
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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".