Development of a novel flax soy-based polyurethane prepreg composite
Bibliographic record
Abstract
High performance composite materials are mostly synthesized from non-renewable resources with a detrimental environmental impact. In this work an innovative flax fiber-reinforced soy-based polyurethane composite prepreg was developed from a soy-based polyol crosslinked with glycerin and isocyanate. The flax reinforcement was manufactured by binding unidirectional flax strings with short flax fibers. Composite prepregs were fabricated using a three rolls mill and oven pre-curing to obtain a beta stage. Vacuum assisted molding was used to manufacture laminates with a fiber volume fraction up to 41 %. Electron beam and optical microscope images of the composite cross-section indicated an adequate microstructure. Tensile strength (209 MPa), flexural strength (231 MPa), and short beam shear strength (25 MPa) demonstrated that the composites had good specific mechanical properties comparable with composites containing glass fibers studied in previous works, while having a significantly lower expected environmental impact. These properties demonstrate the appropriateness of the eco-responsible composite material.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 source (direct Gemma or distilled Codex), 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".