Nonlinear rheology of hyperbranched polyisobutylene
Why this work is in the frame
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Bibliographic record
Abstract
The nonlinear shear rheology of a hyperbranched polyisobutylene (PIB) with narrow molecular weight distribution (Mw/Mn=1.3) was compared to that of a polydisperse (Mw/Mn=2.5) linear PIB. After adjusting the respective measurement temperatures to yield equal shear viscosities, the rheology was found to be quite similar for the two polymers, notwithstanding their markedly different structures. These similarities persisted in capillary extrusion experiments at moderate shear rates, on the compounds reinforced with carbon black. However, at higher shear rates, the linear PIB exhibits a greater elastic response, with consequently larger extrudate swell.
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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) | 0.000 | 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) | 0.008 | 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