Polysulfone-<i>g</i><i>raft</i>-poly(<i>tert</i>-butyl acrylate): Synthesis, Nanophase Separation, Poly(<i>tert</i>-butyl acrylate) Hydrolysis, and pH-Dependent Iridescence
Bibliographic record
Abstract
Polysulfone- graft -poly( tert -butyl acrylate) or PSf- g -P t BA samples were prepared by reacting lithiated Udel polysulfone (PSf) in THF at −78 °C with bromine-end-functionalized poly( tert -butyl acrylate) or P t BA-Br. In bulk, the P t BA branches segregated from the PSf backbone to form nanometer-sized domains. The P t BA domain shape changed from wormlike to cylindrical and to lamellar as its volume fraction increased from 19.2% to 44%. While the wormlike and cylindrical morphologies lacked long-range order, the alternating P t BA and PSf lamellae were packed regularly. The P t BA domains in such graft copolymer films could be hydrolyzed to yield poly(acrylic acid) or PAA chains without affecting film integrity. After P t BA hydrolysis, a sample with a P t BA volume fraction of 38% showed iridescence or a 1-D photonic stop band at ∼450 nm in basic water. The iridescence could be turned off and on by cycling pH between 2 and 10, for example.
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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".