Studying a Slow Polymerization: A Kinetic Investigation of the Living Anionic Polymerization of PC Bonds
Bibliographic record
Abstract
The n -butyllithium-initiated living anionic polymerization of MesP CPh 2 (Mes = 2,4,6-trimethylphenyl) was studied at a variety of temperatures ( T = 296.3, 301.8, 307.4, 313.0, 318.6, and 324.2 K) with a fixed monomer-to-initiator ratio (50:1). The consumption of monomer and formation of polymer n Bu[MesP−CPh 2 ] n Li was monitored by 31 P NMR spectroscopy, and the conversion data obtained were analyzed using first-order kinetics. Up to 50% conversion, the plot of ln [M] 0 /[M] vs time was linear, and apparent propagation rate constants ( k p ) were extracted ( k p = 21−150 L mol -1 h -1, T = 296−324 K). These rate constants were used to construct an Arrhenius plot, and the apparent activation energy for the propagation of P C bonds was estimated ( E a = 14.0 ± 0.9 kcal mol -1 ).
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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 | 0.001 |
| 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".