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Encoding Force-Responsive Speed Bumps Into Slide-Ring Networks for Programmable Mechanical Properties
Haiyun Zhang1, Yichen Huang1, Siyu Jin1
1Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, Shaanxi, People's Republic of China.
Angewandte Chemie (International Ed. in English)
|July 30, 2026
Summary
This study introduces mechanically gated "speed bumps" into slide-ring (SR) materials, enabling controlled energy dissipation for enhanced toughness and adaptive mechanical properties in polymer networks.
Area of Science:
- Polymer Science and Engineering
- Materials Science
- Supramolecular Chemistry
Background:
- Slide-ring (SR) materials utilize mobile crosslinkers for superior toughness and fatigue resistance via the pulley effect.
- Conventional SR networks lack temporal and spatial control over energy dissipation due to passive macrocycle sliding.
Purpose of the Study:
- To introduce mechanically gated
- speed bumps
- into SR architectures for regulated energy dissipation.
- To develop a mechanically interlocked polyurethane network with spatiotemporal control over energy dissipation.
Main Methods:
- Synthesized a mechanically interlocked polyurethane network (PU-DP-TED-a) incorporating pillar[5]arene macrocycles (DP) and Diels-Alder adducts (TED).
- Investigated the effect of force-labile TED units acting as speed bumps on macrocycle sliding under tension.
- Analyzed the retro-Diels-Alder reaction triggered by macrocycle-TED interaction for energy dissipation.
Main Results:
- The developed SR material exhibits a force-triggered, sequential
- arrest-and-release
- mechanism for spatiotemporal energy dissipation.
- Young's modulus increased 9.9-fold, tensile strength 6.0-fold, elongation at break 2.9-fold, and toughness 16.6-fold compared to a control.
- Demonstrated significant enhancements in mechanical properties, including modulus, strength, elongation, and toughness.
Conclusions:
- Established a paradigm for active, force-programmable SR materials with multi-stage energy dissipation.
- The mechanically interlocked architecture provides adaptive mechanical behavior and enhanced material performance.
- This approach offers a new strategy for designing advanced polymer networks with tunable mechanical responses.
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