Shear in Surface Gel of Associative Polymer
Bibliographic record
Abstract
The normal and shear forces between adsorbed layers of telechelic associative polymer poly(ethylene oxide) end-terminated with octadecyl groups have been studied using a surface force balance. The normal forces profiles measured for polymer monolayers and surface gels were similar to those reported for the same polymer in earlier studies. The shear forces between the polymer-covered surfaces were very weak up to compression of ca. 0.27 of the original thickness of the polymer layers, corresponding to the effective friction coefficient μ < 0.04. Weak frictional forces were attributed to osmotic repulsion between poly(ethylene oxide) chains and shear thinning of the gelled polymer. At higher polymer compression the shear forces gradually increased due to compression-forced increase in interpenetration and entanglement of the macromolecules adhering to the two opposite surfaces and interactions between the octadecyl groups. Shear thinning was also observed for long-time shear and for shear velocity v s exceeding 600 nm/s. For strongly compressed polymer and v s < 600 nm/s the dependence of frictional forces on the shear velocity was weak, caused by a thinning of the interpenetration zone between the sheared polymer layers and/or a transition of the slip plane to the polymer−substrate interface.
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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 | 0.000 | 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) | 0.000 | 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 teacher head, 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".