Dynamic cross-linked topological network reconciles the longstanding contradictory properties of polymers.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40106568.
- Also identified by DOI 10.1126/sciadv.adt0825 and PMC identifier 11922047.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
There is usually a trade-off between high-tensile properties and processability in polymers because the mechanisms of these properties are mutually exclusive. Here, we design a chemically coupled four-arm dynamic polymer cross-link site to overcome this challenge. By concurrently increasing cross-link sites and dynamic bond contents, this approach fabricates polymer networks with high cross-link density yet low processing temperature, challenging the conventional structure-property relationship where cross-linking inherently limits plasticity. Notably, the material demonstrates remarkable processability, evidenced by the ratio of <i>G</i><b>'</b><sub>max</sub> to <i>G</i><b>'</b><sub>min</sub> with a temperature differential (Δ<i>T</i>) of 120°C (which signifies the soft-to-hard transition capability). This ratio reaches 153.3, higher than all reported cross-linked polyurethanes. This work represents a molecular strategy that combines electronic effect and topology network design to modulate materials' properties, and it will be useful for developing next-generation materials.