Physical Aging as the Driving Force for Brittle–Ductile Transition of Polylactic Acid
Bibliographic record
Abstract
Abstract Polylactic acid (PLA) is an inherently brittle polymer, exhibiting a high Young's modulus and minimal elongation‐at‐break. To transition its failure mode to one that is much more ductile without loss in strength is challenging. A new strategy combining physical aging with ultraviolet (UV) radiation is carried out to reach the desired mechanical properties of PLA. Characterization of the modified resin is done by mechanical, rheological, and acoustic analysis. With the new processing strategy, the elongation‐at‐break of PLA increases from below 5% up to 18% by conditioning at −40 °C for 48 h followed by UV irradiation for 30 h. Correspondingly, results demonstrate that the yield strength and Young's modulus remain statistically unchanged. The interlocked entanglements inhibit the formation and evolution of subordered structures, which are attributed to the gained ductility. The high entanglement density and few subordered structures in the modified polymer system contribute to the unusual elongation‐at‐break without alteration of the modulus.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.000 | 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 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".