An Improved Mimetic Compound for Styrene “Living” Free Radical Polymerization. An Initiator Containing the “Penultimate” Unit
Bibliographic record
Abstract
A new thermal initiator for living free radical polymerization (LFRP) has been synthesized photochemically by coupling of the free radical TEMPO with the 1,3-diphenyl-1-propyl radical. This initiator ( 4 ), which contains the penultimate monomer unit, is a much better mimetic compound than similar compounds derived from radicals with a single styrene moiety, such as the 1-phenylethyl radical (which yields adduct 2 ). In particular, 4 does not yield any disproportionation products, while other model compounds usually do. This is attributed to the lowest energy conformation of 4, which places the β-hydrogen atoms in an unfavorable stereoelectronic arrangement to give disproportionation products. It is anticipated that the same situation will prevail in the polymer, and it is instrumental in determining the low polydispersities achievable with LFRP. This report includes a detailed study of the properties of 4, including its thermal decomposition and relevant free radical kinetics, as well as a comparison of the rotational barrier of 4 with that of 2 .
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".