Nitroxide-Mediated Living Radical Polymerization of 2-Hydroxyethyl Acrylate and the Synthesis of Amphiphilic Block Copolymers
Why this work is in the frame
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Bibliographic record
Abstract
Nitroxide-mediated radical polymerizations of 2-hydroxyethyl acrylate (HEA) were performed in bulk, in organic solvent ( N, N -dimethylformamide), and in aqueous media at 100−120 °C, using an alkoxyamine initiator based on N - tert -butyl- N -(1-diethyl phosphono-2,2-dimethylpropyl) nitroxide, SG1. By the addition of free nitroxide (6−12 mol% with respect to the initiator), the polymerizations were controlled, exhibiting a linear relationship of ln([M] 0 /[M]) vs time and M n vs conversion up to 50−60% conversion. Poly(HEA) with M n ≈ 90 000 and M w / M n < 1.3 can be obtained by bulk polymerization. Solution polymerizations of HEA in N, N -dimethylformamide and in water exhibit comparable kinetics to those of HEA bulk polymerizations at the same temperature. Chain transfer to polymer produced up to 1.7 mol% branches for poly(HEA) depending on the reaction conditions, with a trend of increasing long chain branching with conversion. Amphiphilic block copolymers of poly(BA- b -HEA) with different molecular weights and block composition were synthesized from a poly( n -butyl acrylate) (pBA) macroinitiator.
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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 | 0.001 |
| 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 it