Synthesis and Characterization of Benzyl Methacrylate/Styrene Random Copolymers Prepared by NMP
Bibliographic record
Abstract
Abstract BzMA/styrene random copolymers were synthesized in bulk (molar feed compositions fBzMA,0 = 10–90 mol‐%) at 90 °C by NMP with about 10% free SG1 relative to BlocBuilder initiator. Reactivity ratios (rBzMA = 0.86 ± 0.36, rstyrene = 0.27 ± 0.14) were comparable to those reported by conventional radical polymerization. Linear $\overline M _{\rm n} $ increase with conversion was observed up to ∼50% conversion, and all copolymers had low $\overline M _{\rm w} /\overline M _{\rm n} $ = 1.2–1.4. The $\left\langle {k_{\rm p} } \right\rangle \left\langle K \right\rangle $ ($\left\langle {k_{\rm p} } \right\rangle $ = average propagation rate constant and $\left\langle K \right\rangle $ = average equilibrium constant) exponentially increased with increasing fBzMA,0. Chain extensions with styrene at 110 °C initiated by BzMA/styrene copolymers made with fBzMA,0 <80 mol‐% were highly living while macroinitatiors with fBzMA,0 >90 mol‐% were not, based on GPC and 31P NMR results. magnified image
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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) | 0.000 | 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) | 0.001 | 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".