Synthesis of thioether derivatives of brominated poly(isobutylene‐<i>co</i>‐isoprene): Direct coupling chemistry for silica reinforcement
Bibliographic record
Abstract
Abstract Thioether derivatives of brominated poly(isobutylene‐ co ‐isoprene) (BIIR) were prepared through base‐mediated nucleophilic substitution reactions of the elastomer with thiolate ions formed in situ from thiols. The characterization of the reaction products was accomplished with studies of a model compound, brominated 2,2,4,8,8‐pentamethyl‐4‐nonene, the reactivity of which was shown to be consistent with that of the polymer. The reaction of aliphatic thiols with the allylic bromide functionality of BIIR required a strong base, and base‐catalyzed air oxidation of the thiol to disulfide operated concurrently to reduce the yield of the desired substitution products. An efficient and direct method of coupling BIIR to silica with (3‐mercaptopropyl)trimethoxysilane improved filler dispersion, thereby overcoming problematic agglomeration of reinforcing siliceous fillers in these compounds. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 2937–2944, 2002
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How this classification was reachedexpand
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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.002 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".