Novel Bio-based Thermoplastic Polyurethanes Derived From Oleanolic Acid
Bibliographic record
Abstract
A series of novel polyurethanes (PU) were synthesized by incorporation of erythrodiol (ErDO), produced by direct reduction of the naturally occurring pentacyclic triterpenoid oleanolic acid (OA). Polyaddition was performed with four different diisocyanates, including the bio-based 1,5-pentamethylene diisocyanate (PDI). PUs were obtained with Mn values up to 43 kg mol–1 (from size-exclusion chromatography), thermal stability up to 310 °C, and high glass-transition temperatures (Tg) up to approximately 250 °C. Copolymerization with 1,6-hexanediol produced a series of fully biobased, ternary ErDO/PDI-containing PUs with Tg ranging from 206 to 81 °C, without compromising thermal stability.
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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) | 0.001 | 0.000 |
| 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 | 0.001 | 0.001 |
| 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 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".