PLP/SEC/NMR Study of Free Radical Copolymerization of Styrene and Glycidyl Methacrylate
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Bibliographic record
Abstract
Free radical copolymerization of glycidyl methacrylate (GMA) and styrene (ST) is systematically investigated using low conversion pulsed laser polymerization (PLP) experiments. It is shown that GMA, like other methacrylate monomers, undergoes significant depropagation at elevated temperatures. While ST/GMA copolymer composition is well represented by the terminal model, the copolymer-averaged propagation rate coefficient for the system is not; the latter quantity is represented using the implicit penultimate unit model. The PLP data are used to estimate GMA depropagation kinetics as well as ST/GMA monomer ( r ST = 0.31 and r GMA = 0.51) and radical ( s ST = 0.28 and s GMA = 1.05) reactivity ratios, which show no significant variation in the 50−140 °C temperature range examined. The GMA/ST copolymerization behavior is compared to that of butyl methacrylate (BMA) with ST; GMA monomer is more active toward styrene radicals than BMA, and a GMA unit in the penultimate position of styrene radicals reduces copolymerization propagation to a greater extent.
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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