Some properties of PP/PE multilayer and blends films
Bibliographic record
Abstract
In this study, we investigated the structure and properties of multilayer and blends films of polypropylene (PP) and polyethylene (PE) obtained from the blown film extrusion process. Three PP's and an LLDPE were used. The oriented crystalline structure of the PP's was such that b-axis oriented in ND-TD plane and c-axis oriented in MD. PE crystalline morphologies at the interface were different for the different PP's. PP had similar crystalline orientation for blended and co-extruded films but not PE. Tensile strength was larger in MD than TD and tear resistance higher in TD than MD. The modulus and strength were lower for the blend films. Haze depended strongly on the PP used and whether it was pure, multilayer or blended, with the lowest haze obtained for the multilayer films made of copolymer PP and the highest with the multilayer films with homopolymer PP. Oxygen permeability is the lowest for the PP homo and co-polymer films, followed by their multilayer films, then the blended films and the worst is the HMS films. The thermal properties from differential scanning calorimetry will also be discussed as well as some comparison with films made with clay nanoparticles in PP layer or film.
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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) | 0.001 | 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 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".