Phosphorus‐Containing Block Copolymers from the Sequential Living Anionic Copolymerization of a Phosphaalkene with Methyl Methacrylate
Bibliographic record
Abstract
Abstract Although living polymerization methods are widely applicable to organic monomers, their application to inorganic monomers is rare. For the first time, we show that the living poly(methylenephosphine) ( PMP n − ) anion can function as a macroinitiator for olefins. Specifically, the phosphaalkene, MesP=CPh 2 ( PA ), and methyl methacrylate (MMA) can be sequentially copolymerized using the BnLi‐TMEDA initiator system in toluene. A series of PMP n ‐ b ‐PMMA m copolymers with narrow dispersities are accessible ( Đ =1.05–1.10). Analysis of the block copolymers provided evidence for ‐P‐CPh 2 ‐CH 2 ‐CMe(CO 2 Me)‐ switching groups. Importantly, this indicates that the ‐P‐CPh 2 − anion directly initiates the anionic polymerization of MMA and stands in stark contrast to the isomerization mechanism followed for the homopolymerization of PA . For the first time, the glass transition of a PMP n homopolymer has been measured ( T g =45.1 °C, n= 20). The PMP n ‐ b ‐PMMA m copolymers do not phase separate and show a single T g which increases with higher PMMA content.
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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 | 0.001 | 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) | 0.022 | 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".