Secondary Reactions in the High-Temperature Free Radical Polymerization of Butyl Acrylate
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Bibliographic record
Abstract
Secondary reactions have a marked effect on butyl acrylate polymerization rate and polymer structure under the high-temperature free radical reaction conditions typically used for production of solvent-based acrylic coatings resins. The low monomer concentrations characteristic of semibatch starved-feed reactor operation lead to significant rates of intramolecular transfer, resulting in a tertiary radical center capable of termination, monomer addition, or β-scission. The rate coefficients for these reactions are estimated from monomer concentrations, polymer molecular weights, and NMR analyses of quaternary branch points and macromer end groups for a series of semibatch experiments with varying monomer and polymer concentrations. A classical free radical polymerization model is insufficient for the description of this complex system. Thus, a mechanistic model including the additional reactions has been formulated and is shown to provide a good representation of the experimental results.
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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 it