Cross-Linked Poly(methacrylic acid-<i>c</i><i>o</i>-poly(ethylene oxide) methyl ether methacrylate) Microspheres and Microgels Prepared by Precipitation Polymerization: A Morphology Study
Why this work is in the frame
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Bibliographic record
Abstract
We applied the concept of precipitation polymerization in organic solvents to the polar and hydrogen-bonding monomers methacrylic acid (MAA) and poly(ethylene glycol) methyl ether methacrylate (PEGMM), with ethylene dimethacrylate (EDMA) as cross-linker. Soluble copolymers, swellable microgels, microspheres, macrogels, and coagulum were observed after copolymerization in mixtures of methyl ethyl ketone and heptane. Increasing the amount of covalent cross-linker or decreasing the solvency of the reaction medium caused a change of morphology from microgels to microspheres. The ratio of acid to ethylene oxide groups present in the comonomers also dramatically changed the polymer−polymer interactions and hence the morphology. Three types of cross-linking are proposed to exist in this system: covalent cross-linking by EDMA and hydrogen-bonding cross-linking between two acid units as well as between acid and ethylene oxide groups. The size of the particles increased with decreasing solvency, decreasing EDMA concentration and increasing PEGMM concentration.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 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) | 0.003 | 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 it