Arborescent Polystyrene-<i>g</i><i>raft</i>-poly(2-vinylpyridine) Copolymers as Unimolecular Micelles. Synthesis from Acetylated Substrates
Bibliographic record
Abstract
Branched copolymers with a dendritic structure were synthesized by grafting poly(2-vinylpyridine) (P2VP) side chains onto linear and arborescent polystyrene substrates of generations G0−G2 randomly functionalized with acetyl groups. The P2VP side chains were generated in tetrahydrofuran using 1,1-diphenyl-3-methylpentyllithium as the initiator. The living polymer was then titrated with a solution of acetylated substrate to yield the copolymer. The grafting yield reached 92−96% in the 0−25 °C range with LiCl as a reactivity modifier for the P2VP anions. Arborescent copolymers with M w ≈ 5000 or 30 000 P2VP side chains were synthesized. The copolymers with short side chains contain 82−92 mol % P2VP units. For the long side chain systems, the P2VP content reaches over 97 mol %. These materials are characterized by a very compact structure, a narrow molecular weight distribution ( M w / M n = 1.06−1.08), and a roughly geometric increase in branching functionality and molecular weight for successive generations. The copolymers derived from the linear polystyrene substrate aggregate when dissolved in aqueous HCl solutions. In contrast, copolymers based on G0−G2 substrates give unimolecular micellar solutions under the same conditions.
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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) | 0.001 | 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 | 0.001 |
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".