Nitroxide‐mediated radical polymerization of methacryloisobutyl POSS and its block copolymers with poly(<i>n</i>‐acryloylmorpholine)
Bibliographic record
Abstract
ABSTRACT Nitroxide‐mediated radical polymerization (NMP) of the bulky methacryloisobutyl‐polyhedral oligomeric silsesquioxane (POSS‐MA) is successfully achieved after optimizing reaction conditions such as selection of controlling comonomer, comonomer feed molar ratio, and temperature (10 mol % styrene (S) comonomer at 110 °C using the commercially available BlocBuilder as the NMP initiator). The P(POSS‐MA‐co‐S) with a molecular weight of ~8000 g/mol and dispersity Ж1.2 is afforded under the optimized reaction conditions. The chain‐end fidelity is verified by chain extension experiments with N‐acryloyl morpholine (ACM) via NMP that produces well‐defined amphiphilic hybrid P(POSS‐MA‐co‐S)‐b‐P(ACM)x block copolymers, where the subscript “x” represents the degree of polymerization of (ACM) block (182 < x < 695). The size exclusion chromatography (SEC) of the as‐synthesized samples reveals the presence of some dead P(POSS‐MA‐co‐S) chains that could be removed by a simple purification step. Kinetic investigations reveal a first‐order kinetics for the polymerization of ACM using P(POSS‐MA‐co‐S) as the macroinitiator under NMP conditions. The kinetic and SEC data confirms the controlled nature of the NMP of ACM. Being amphiphilic, the formed P(POSS‐MA‐co‐S)‐b‐P(ACM)x block copolymers self‐assembled in aqueous solution as revealed by the fluorescence spectroscopy experiments with pyrene as the probe for determination of the critical micelle concentration and dynamic light scattering studies. © 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 428–437
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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".