Supramolecular Cross-Linking of Hydrocarbon Polymers for the Formation of High-Performance and Recyclable Materials
Bibliographic record
Abstract
Thanks to their excellent thermomechanical properties, cross-linked polymers are widely used for a myriad of applications. However, due to the presence of covalent cross-links, these polymers are usually considered nonrecyclable. For hydrocarbon polymers, this problem is particularly acute because, due to the lack of functional groups, the few known cross-linking strategies are based on highly stable covalent bonds. To address this problem, we propose here a strategy to physically cross-link a polymer by adding a supramolecular host, which can complex two pendant alkyl groups of a macromolecular chain. We demonstrate that dimethoxypillar[5]arene (DM-P[5]A) possesses this unique ability. Taking advantage of this phenomenon, poly(1-decene) (PD) is conveniently cross-linked upon the addition of DM-P[5]A, thus transforming a viscous liquid into an elastomer. Furthermore, reversible cross-linking is also efficient in the solid state: for example, high- T g poly(5-hexyl-2-norbornene) (PNBE) becomes cross-linked when containing DM-P[5]A, resulting in polymers with greater mechanical properties. Remarkably, DM-P[5]A can be simply washed out with a suitable solvent, allowing the recovery of the pristine polymer free of cross-links. This very straightforward strategy thus allows any polymer containing pendant alkyl groups to be reversibly cross-linked, thus essentially solving the problem of recyclability of cross-linked polymers.
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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) | 0.000 | 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".