Hyperbranched Poly(octadecyl Acrylate)s as Lubricant Additive Studied by Resonance Shear Measurement
Bibliographic record
Abstract
Polymer additives are commonly used in lubricants, yet previous studies have predominantly focused on those with linear chain structures. Generally, low viscosity lubricants are effective in the hydrodynamic lubrication regime, but they lead to increased friction and wear in the boundary lubrication regime. In this study, hyperbranched poly(octadecyl acrylate)s (HBPs) were proposed as a novel class of lubricant additives, and their performance was compared to that of linear polymers. HBPs with controlled macromolecular structures were synthesized by the organotellurium-mediated radical polymerization and evaluated as additives in a poly(α-olefin) (PAO) base oil. Viscosity measurements showed that HBP solutions maintained low fluid resistance comparable to PAO itself, unlike linear polymers, which increased in viscosity. Resonance shear measurements demonstrated superior nanoscopic lubrication efficiency for HBPs, HBPs > linear polymers > PAO, and macroscopic friction tests confirmed a significant reduction in the coefficient of friction in the boundary lubrication regime. These results revealed that HBPs offered effective lubrication for both the hydrodynamic and boundary lubrication regimes.
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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) | 0.001 | 0.001 |
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".