The Role of Nitroxide Degradation on the Efficiency of the Controller in Nitroxide-Mediated Radical Polymerization (NMP) of Styrene
Bibliographic record
Abstract
The effect of nitroxide degradation on polymerization rate and molar mass development in the nitroxide-mediated radical polymerization (NMP) of styrene is studied using electron spin resonance (ESR) spectroscopy and a mathematical model based on the method of moments. The stability of two nitroxides, 3,3-diphenyl-1,1-dimethyl azabutane N-oxide (azabutane) and 2,2,5-trimethyl-4-phenyl-azahexane N-oxide (TIPNO), is followed by ESR spectroscopy, and the products present in the final mixture are separated and analyzed. Significant nitroxide degradation is observed in both cases. The rate of azabutane degradation is about 100 times faster than that of TIPNO. Although a degradation mechanism is proposed, it is assumed in the model, for simplicity, that a new type of radical and a nitroso compound are produced. This new radical can propagate and terminate. Its participation is properly addressed in the polymerization scheme and its corresponding model. The model is validated using experimental data of styrene polymerization mediated by alkoxyamines derived from azabutane and TIPNO at 120 °C. Azabutane degradation significantly affects polymerization rate, initial molar mass, and end-group functionality of the polymer. The model provides a good representation of the effect of nitroxide degradation on NMP of styrene.
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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 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".