Atom Transfer Radical Polymerization of Poly(ethylene glycol) Dimethacrylate
Bibliographic record
Abstract
Reported is an experimental investigation on the atom transfer radical polymerization (ATRP) of poly(ethylene glycol) dimethacrylate (PEGDMA) initiated by an alkyl halide. The polymerization behaviors of PEGDMA in ATRP and in a conventional free radical polymerization were compared with respect to polymerization rate and gel formation. The ATRP of PEGDMA proceeded with a low rate and no observable autoacceleration, while benzoyl peroxide initiated free radical polymerization showed a strong autoacceleration from the beginning of the reaction. The radical signals, as well as copper(II) signals, in the ATRP system were observed by electron spin resonance, confirming the participation of radical intermediates in the ATRP process. At the early stage of polymerization (<40% conversion), the ATRP process proceeded in a living manner with a low and constant radical concentration. However, as the reaction continued, the increased diffusion resistance restricted the mobility of the catalyst/ligand complexes and interrupted the equilibrium between growing radicals and dormant species, resulting in a transition of the reaction mechanism to a conventional free radical polymerization process.
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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 | 0.001 |
| 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".