High‐Molecular‐Weight Isobutene–Isoprene Copolymers Containing Unusually High Isoprene Content
Bibliographic record
Abstract
Abstract Summary: The 1:2 adduct of the highly electrophilic borane B(C 6 F 5 ) 3 with n ‐decanoic (stearic) acid, [ n ‐C 17 H 35 CO 2 H][B(C 6 F 5 ) 3 ] 2 exhibits sufficiently enhanced acidity that it is an excellent initiator for the carbocationic copolymerization of isobutene with isoprene in methylene chloride and methyl chloride. High conversions to gel free, high‐molecular‐weight copolymers containing up to 15 wt.‐% isoprene are readily obtained, consistent with the anion [ n ‐C 17 H 35 CO 2 {BC 6 F 5 ) 3 } 2 ] − being very weakly coordinating. Thus chain transfer following IP incorporation into the growing polymeric chain, which normally results in low average molecular weights, is much less of a factor here. The acidic 1:2 adduct of B(C 6 F 5 ) 3 with n ‐decanoic acid, [ n ‐C 17 H 35 CO 2 H][B(C 6 F 5 ) 3 ] 2 , as an initiator for the carbocationic copolymerization of isobutene with isoprene. magnified image The acidic 1:2 adduct of B(C 6 F 5 ) 3 with n ‐decanoic acid, [ n ‐C 17 H 35 CO 2 H][B(C 6 F 5 ) 3 ] 2 , as an initiator for the carbocationic copolymerization of isobutene with isoprene.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".