A “green” technique for high performance elastomers – fundamental investigation for hydrogenation of nitrile butadiene rubber in supercritical carbon dioxide
Bibliographic record
Abstract
NBR hydrogenation, catalyzed by OsHCl(CO)(O2)(PCy3)2 is investigated in supercritical carbon dioxide (SC-CO2). The experiments were carried out in a volume-changeable SFT Phase Monitor with a view window. It was found that the catalyst could maintain steady activity in SC-CO2 for a long time and no deactivation or decomposition of the catalyst was observed during the experimental operation periods. The reaction reached a conversion of 98% within 2.5 hours at 150°C. Increasing the temperature, specific area of NBR, CO2 density and catalyst concentration favours higher hydrogenation degree, but the effect of hydrogen pressure is complicated and attention must be given to find the optimal hydrogen pressure. The results suggest that NBR hydrogenation could be possibly realized in SCFs in place of conventional organic solvents.
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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) | 0.000 | 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) | 0.000 | 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".