Understanding Olefin Solubility in Polyethylene from a Molecular Dynamics Simulation Perspective
Bibliographic record
Abstract
We investigated the sorption mechanisms of ethylene (ETH) and 1-hexene (HEX) in polyethylene (PE) using molecular dynamics (MD) simulations at 80 °C and various pressures. The simulations revealed that ETH molecules can hinder HEX-PE interactions, reducing HEX clustering with PE chains. This may explain the experimentally observed antisolvent effect of ETH on HEX. Conversely, HEX can enhance the sorption of ETH by acting as carriers, facilitating ETH interactions with PE chain ends. This cosolubility effect was captured by introducing a correction term, S indirect, which accounts for ETH molecules that interact indirectly with PE via HEX. Total ETH solubility is thus expressed as S ETH = S direct + γ S indirect, where S direct corresponds to ETH directly interacting with PE and γ represents the contribution from ETH molecules interacting simultaneously with HEX and PE. Our findings demonstrate that MD offer powerful insights into the molecular-level mechanisms governing sorption in complex, multicomponent systems, such as those encountered in polyolefin reactors.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 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 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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".