Self-Complexation of Poly(ethylene oxide)-<i>b</i><i>lock</i>-poly(methacrylic acid) Studied by Fluorescence Spectroscopy
Bibliographic record
Abstract
The evolution of the self-complexation of poly(ethylene oxide)- block -poly(methacrylic acid), PEO- block -PMAA, as a function of the degree of ionization has been studied by means of fluorescence spectroscopy and dynamic light scattering. Pyrene and naphthalene singly labeled block copolymers were used, with two different methacrylic acid block lengths. The conformation of the block copolymers changes with varying degree of ionization due to the hydrophobic nature of the methyl group of the methacrylic acid units as well as due to the hydrogen bonding that takes place between the methacrylic acid units and ethylene oxide units. The limiting degrees of ionization between the states where the block copolymers are molecularly dissolved or intra- or intermolecularly complexed were determined. The chain exchange between the self-complex particles at low degree of ionization was observed to take place via two mechanisms. Insertion and expulsion of the single chains is responsible of the faster exchange event whereas the slower chain exchange occurs by merging and splitting of the self-complex particles.
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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) | 0.000 | 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".