TEMPO-Mediated <i>n</i>-Butyl Acrylate Polymerizations
Bibliographic record
Abstract
Polymerizations of n -butyl acrylate under stable free radical polymerization (SFRP) conditions, using TEMPO as the nitroxide mediator, are reported at reaction temperatures between 133 and 135 °C. The polymerizations proceed in a living manner under both bulk and miniemulsion conditions with polydispersities of around 1.3. Plots of number-average molecular weight vs conversion and ln([M] 0 /[M]) vs time are linear, indicating a controlled polymerization. It is argued that the ability of a particular nitroxide to control the polymerization of n -butyl acrylate is not only due to a favorable equilibrium constant ( K ) between the dormant and active polymeric species in the system but also due to the amount of excess nitroxide that is present. In these experiments excess TEMPO is controlled by the continuous addition of a dilute solution of ascorbic acid or an ascorbic acid derivative, leading to successful n -butyl acrylate polymerizations. Chain extension of a homopoly( n -butyl acrylate) prepared under miniemulsion conditions is demonstrated.
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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) | 0.001 | 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 | 0.001 |
| 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".