Well-Defined Chain-End Functionalized Polyethylenes with Different Macromolecular Architectures
Bibliographic record
Abstract
This study reports the synthesis of a wide library of α,ω-dihydroxy, ω-hydroxy (linear and 3-arm star), and ω-amine functionalized, as well as nonfunctionalized polyethylenes (linear and 3-arm star) via diimide hydrogenation of the corresponding polybutadiene precursors. All polyethylenes were synthesized using anionic polymerization high-vacuum techniques followed by suitable postpolymerization reactions and hydrogenation. Molecular characterization confirmed low 1,2-microstructures in the polybutadiene precursors, resulting in linear low-density polyethylene (LLDPE)-like architectures, after hydrogenation. Additionally, perfectly linear ω-hydroxy polymethylene (equivalent to polyethylene) samples, resembling high-density polyethylene (HDPE) structures, were synthesized via polyhomologation. Thermal analysis and X-ray diffraction measurements showed reduced crystallinity in the functionalized samples, likely due to hydrogen-bonding effects that disturb the crystalline packing. In contrast, the polyethylene synthesized via polyhomologation exhibited higher crystallinity values, resembling the structure of high-density polyethylene (HDPE). These findings underscore the influence of functional groups on polyethylene properties, motivating future studies on their thermal and dielectric behavior.
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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) | 0.003 | 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".