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Published on: October 31, 2019
Skin-Inspired Tough Elastomer with Moisture-Triggered Switchable Mechanical Properties
Ruoyu Xu1, Jing Bai1, Shuai Zhou1
1School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composite Materials and Shanghai Key Lab of Electrical Insulation and Thermal Ageing, Shanghai Jiao Tong University, No.800 Dongchuan Road, Minhang District, Shanghai, 200240, China.
This study introduces novel soft composite materials combining elastomer and hydrogel phases. These materials exhibit remarkable strength and toughness in both wet and dry states, overcoming limitations of traditional synthetic tissues.
Area of Science:
- Materials Science
- Polymer Science
- Biomaterials Engineering
Background:
- Biological tissues possess excellent water-adaptive mechanical properties, maintaining strength and toughness in both wet and dry conditions.
- Synthetic hydrogels often become brittle when dry, limiting their applications.
- Developing synthetic materials that mimic the dual wet/dry mechanical adaptability of biological tissues remains a significant challenge.
Purpose of the Study:
- To engineer novel soft composite materials with continuous elastomer and hydrogel phases.
- To overcome the brittleness of dry hydrogels by integrating them with elastomers.
- To achieve materials with tunable mechanical properties adaptable to both wet and dry environments.
Main Methods:
- Utilizing iron-catechol complex (TA-Fe3+) as a crosslinking platform to combine distinct polymers (elastomer and hydrogel).
- Constructing heterogeneous phase structures with two continuous phases.
- Investigating the mechanical properties of the composite material in both wet and dry states.
- Exploring shape memory behaviors and photo-thermal properties.
Main Results:
- The developed composite material exhibits enhanced strength and toughness in the dry state due to the reinforced xerogel phase.
- In the wet state, the material functions as a high-performance hydrogel, with the elastomer phase providing load-bearing capacity.
- The heterogeneous phase structure successfully balances strength and toughness across different hydration levels.
- Demonstrated shape memory effects in both wet and dry states, linked to the photo-thermal properties of TA-Fe3+.
Conclusions:
- The TA-Fe3+ platform enables the creation of unique soft composite materials with dual continuous phases.
- These materials offer a promising strategy for designing synthetic tissues with adaptable mechanical properties.
- The demonstrated properties suggest potential applications in adaptive shape transformation and remote-controlled engineering tasks.
