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 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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.003 | 0.003 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.004 |
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; both teacher heads agree on what is shown here.
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".