A Capping Method for Nitrogen Anion Initiated Living Anionic Polymerization for Synthesizing Alkyl Methacrylate Macromonomers
Bibliographic record
Abstract
Lithium alkylamides are important functional initiators for anionic polymerization of methacrylates, but only sterically hindered ones can initiate a successful living polymerization. A capping method is reported here to modify nitrogen anion initiators (capping reaction) for living anionic polymerization of alkyl methacrylates. Dimethylacrylamide (DMA) and tert -butyl methacrylate ( t BMA) were found to be effective capping agents for lithium diallylamide. After capped with DMA or t BMA, the initiator efficiency of lithium diallylamide was increased from 0.1 to 0.9 for various monomers. Monosubstituted lithium alkylamides (vinyloxypropylamide and allylamide) could not directly initiate the polymerization of methacrylates due to severe reaction with the carbonyl groups in the monomers. After capped with DMA, the initiators polymerized methacrylates with initiator efficiency about 0.4−0.6, depending on the monomer type. t BMA was not suitable as capping agent for the monosubstituted lithium amides. Using these capped initiators, we subsequently synthesized block copolymers. 1 H NMR demonstrated that all the polymers prepared had terminal unsaturated groups from the initiators.
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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 | 0.000 | 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".