Mobility Control of Mechanical Bonds to Modulate Energy Dissipation in Mechanically Interlocked Networks

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: March 11, 2025

Mechanically interlocked networks (MINs) with dense mechanical bonds can amplify the dynamic behaviors of to exhibit decent properties. Energy dissipation resulting from bond motion is essential for improving toughness, yet effective strategies optimize this process remain underexplored. Here, by designing models controllable mobility, we establish a fortification strategy two key factors governing energy dissipation, host–guest recognition and sliding friction, thereby enabling property enhancement mechanically materials. Specifically, [2]rotaxanes in MIN-1 MIN-2 identical axle structures, incorporating small benzo-21-crown-7 ring large benzo-24-crown-8 ring. Strain rate-dependent cyclic tensile tests reveal that required drive 510 260 kJ/m3, respectively, indicating wheel size enhances recognition. Furthermore, apparent activation (11.0 kJ/mol) higher than (6.70 kJ/mol), suggesting increased friction MIN-1. Due these aspects, exhibits superior performance (damping capacity = 92%) compared (78%), translating toughness (7.50 vs 5.70 MJ/m3).

Language: Английский

---

Ring‐Toughened Polymer Networks: The Mighty Impact of Specially Designed Rings on Mechanical Properties

Chemistry - A European Journal, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Abstract Polymer network materials are gaining significance in daily life and industrial applications. Improving polymer materials’ mechanical properties has long been a focus for chemists scientists. Generally, rings networks viewed as adverse elements leading to reduced performance. In this conceptual article, recent advancements related strategies utilizing specially designed enhance the of summarized discussed. The article concludes by discussing current challenges future prospects field. We aim offer readers an overview ring‐toughened catalyze swift progress burgeoning area.

Language: Английский

---

Bioelectronics with Topological Crosslinked Networks for Tactile Perception

Advanced Physics Research, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 4, 2025

Abstract Bioelectronics, which integrate biological systems with electronic components, have attracted significant attention in developing biomimetic materials and advanced hardware architectures to enable novel information‐processing systems, sensors, actuators. However, the rigidity of conjugated molecular lack reconfigurability static crosslinked structures pose challenges for flexible sensing applications. Topological networks (TCNs) featuring dynamic interactions offer enhanced flexibility environmentally induced reconfigurability, decoupling competition between performances. Here, recent advances are summarized assembly methods bioelectronics different TCNs elaborate ion/electron‐transport mechanisms from perspective interactions. Decoupling effects can be achieved by comparing distinct their respective properties, an outlook is provided on a new range neuromorphic biocompatibility, self‐healing, self‐powered, multimodal‐sensing capabilities. The development TCN‐based significantly impact fields artificial perception devices, networks, systems.

Language: Английский

---

Polyurethane Elastomers Strengthened by Pseudo[1]rotaxanes Based on Pillararenes

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 23, 2024

Abstract As a unique property of the interlocked structures, rotaxane allows for intramolecular motions between its wheel and axle components. Introduction rotaxanes into polymers can endow them with distinctive macroscopic features outstanding mechanical properties. Here, we prepare copillar[5]arene hydroxyl an amino‐group on each end, which spontaneously form pseudo[1]rotaxane through hydrogen bonds. This possesses releasable extra alkyl chain, is then incorporated linear polyurethane by reacting diisocyanate to elastomers spring‐like structures. The results stress‐strain test dynamic analysis all indicate that sliding part in polymer skeleton greatly dissipate energy, endows higher toughness better fatigue resistance. Moreover, addition moderate amount cuprous bromide cuprous‐thioether coordination further improve

Language: Английский

---

Polyurethane Elastomers Strengthened by Pseudo[1]rotaxanes Based on Pillararenes

Angewandte Chemie, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 23, 2024

Abstract As a unique property of the interlocked structures, rotaxane allows for intramolecular motions between its wheel and axle components. Introduction rotaxanes into polymers can endow them with distinctive macroscopic features outstanding mechanical properties. Here, we prepare copillar[5]arene hydroxyl an amino‐group on each end, which spontaneously form pseudo[1]rotaxane through hydrogen bonds. This possesses releasable extra alkyl chain, is then incorporated linear polyurethane by reacting diisocyanate to elastomers spring‐like structures. The results stress‐strain test dynamic analysis all indicate that sliding part in polymer skeleton greatly dissipate energy, endows higher toughness better fatigue resistance. Moreover, addition moderate amount cuprous bromide cuprous‐thioether coordination further improve

Language: Английский

---