Ultra-stretchable hydrogels with hierarchical hydrogen bonds.
Yujing You1, Jian Yang1, Qiang Zheng1
1School of Materials Science and Chemical Engineering, Ningbo University of Technology, 201 Fenghua Road, Jiangbei, Ningbo, 315211, Zhejiang, China.
Scientific Reports
|July 18, 2020
Summary
This study introduces a novel hydrogel with a hierarchical hydrogen bond system for advanced soft materials. These materials exhibit tunable mechanical properties, exceptional stretchability, and toughness, making them suitable for flexible electronics.
Area of Science:
- Materials Science
- Polymer Chemistry
Background:
- Hydrogels are crucial for intelligent soft materials and flexible electronics.
- Developing hydrogels with tunable mechanical properties is an ongoing challenge.
Purpose of the Study:
- To synthesize and characterize a novel hydrogel with a hierarchical hydrogen bond system.
- To explore the relationship between hydrogen bond balance and hydrogel properties.
Main Methods:
- Utilizing a hierarchical hydrogen bond system with weak (DMAA-AAc) and strong (2-ureido-4[1H]-pyrimidinone) interactions.
- Optimizing the ratios of N,N-dimethylacrylamides (DMAA) and acrylic acid (AAc).
Main Results:
- Achieved transparent hydrogels with tunable Young's modulus from 70 to 1,250 kPa.
- Demonstrated high stretchability (up to 4,340% strain) and toughness (10.8 kJ/m²).
- Exhibited notch insensitivity at high stretch ratios (λ = 19.6).
Conclusions:
- The developed hydrogel possesses a unique combination of properties suitable for advanced applications.
- The hierarchical hydrogen bond system offers a pathway to engineer high-performance hydrogels.
- These findings advance the design of materials for flexible electronics and soft robotics.
