Atom Transfer Radical Polymerization of Methyl Methacrylate Mediated by Copper Bromide−Tetraethyldiethylenetriamine Grafted on Soluble and Recoverable Poly(ethylene-<i>b</i>-ethylene glycol) Supports
Bibliographic record
Abstract
Polyethylene (PE) and polyethylene- block- poly(ethylene glycol) (PE-PEG) grafted with N, N, N ‘, N ‘ -tetraethyldiethylenetriamine (TEDETA) were used as soluble and recoverable supports for copper bromide mediated atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA). The PE chain length and poly(ethylene glycol) (PEG) spacer strongly affected the catalytic activity and control of the polymerization. With PE as a catalyst support, the catalytic activity and control of the polymerization were low and decreased as the PE support's chain length increased. The adverse effects of the PE support were minimized by using PEG as spacer to graft the catalyst onto the PE support. The PE 25 -PEG 4 -TEDETA-CuBr and PE 16 -PEG 10 -TEDETA-CuBr were found effectively mediated ATRP of MMA. The recycled PE-supported catalysts had low activity because of catalyst side reactions and/or catalyst loss, but the PE 25 -PEG 4 -TEDETA-CuBr retained 90% activity upon recycling and had good control over the polymerization.
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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".