Imidazolium Bromide Derivatives of Brominated Poly(isobutylene-<i>co</i>-<i>para</i>-methylstyrene): Synthesis of Peroxide-Curable Ionomeric Elastomers
Bibliographic record
Abstract
A series of new elastomeric ionomers is prepared through halide displacement from brominated poly(isobutylene- co - para -methylstyrene) (BIMS) by a range of N-substituted imidazoles. Studies of the dynamics of solvent-borne and solvent-free reactions demonstrate the influence of N-substituent structure on nucleophilicity, with alkyl and allyl groups providing greater reactivity than vinyl functionality. Ionomers bearing pendant styrenic, methacrylic, vinylic, and allylic functionality are cross-linked by standard peroxide initiators to give thermoset derivatives, with reaction rates and yields depending markedly on functional group structure. The discovery of a benzylic N -allylimidazolium ionomer is particularly important, as this material is amenable to solvent-free preparations, and provides a unique combination of moderate cross-linking rates and high cure extents, owing to a balance of radical addition and H-atom transfer reactivity. Physical properties of the resulting thermosets are a product of their hybrid ionic/covalent network, as the material response to deformation is affected by a stable covalent network as well as a labile network of aggregated ion pairs.
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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".