Influence of monomeric and polymeric structure on the physical properties of thermoplastic polyesters derived from hydroxy fatty acids
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Bibliographic record
Abstract
The physical properties of three vegetable oil derived medium and long chain poly(ω‐hydroxy fatty ester)s (P(Me‐ω‐ OHFA )s), namely poly(ω‐hydroxynonanoate) [P(Me‐ω‐ OHC9 )], poly(ω‐hydroxytridecanoate) [P(Me‐ω‐ OHC13 )] and poly(ω‐hydroxyoctadecanoate) [P(Me‐ω‐ OHC18 )] ( n = 8, 12 and 17, respectively), of the [−( CH 2 ) n − COO –] x polyester homologous series are presented. The effect of M n ( M n 10–40 kg mol −1 ) and n on the crystal structure and thermal and mechanical properties of the P(Me‐ω‐ OHFA )s were investigated by wide‐angle X‐ray diffraction ( WAXD ), TGA , DSC , dynamic mechanical analysis ( DMA ) and tensile analysis and are discussed in the context of the [−( CH 2 ) n − COO –] x polyester homologous series, contrasted with linear polyethylene ( PE ). For all P(Me‐ω‐ OHFA )s the WAXD data indicated an orthorhombic crystal phase reminiscent of linear PE with crystallinity ( X c = 50%−80%) depending strongly on M n . The glass transition temperature and Young's modulus for P(Me‐ω‐ OHFA )s increased with X c . The DSC , DMA and TGA studies for P(Me‐ω‐ OHFA )s ( n = 8, 12 and 17) indicated strong correlations between the melting, glass transition and thermal degradation behavior and n . The established predictive structure relationships can be used for the custom engineering of polyester materials suitable for specialty and commodity applications. © 2014 Society of Chemical Industry
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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 | 0.001 |
| 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 it