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Three-Dimensional Printed Hydrogels with High Elasticity, High Toughness, and Ionic Conductivity for Multifunctional
Ziwei Deng1,2,3,4,5, Tianbao Qian1,2,3,4,5,6, Fei Hang1,2,3,4,5
1School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, P. R. China.
ACS Biomaterials Science & Engineering
|December 15, 2020
Summary
Researchers developed a tough, printable hydrogel using poly(ethylene glycol) diacrylate (PEGDA) and chitosan (CS). This double-network material offers enhanced mechanical properties and electrical conductivity for advanced applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Materials Engineering
Background:
- Hydrogels possess unique physical and biological properties but often suffer from low mechanical strength and poor processability.
- Emerging 3D printing technologies for hydrogels necessitate improved formability and controllable mechanical behaviors.
- Developing advanced hydrogels is crucial for applications in tissue engineering and wearable devices.
Purpose of the Study:
- To create a novel double-network biocompatible hydrogel with enhanced mechanical properties and 3D printability.
- To investigate the ionic-covalent cross-linking strategy using poly(ethylene glycol) diacrylate (PEGDA) and chitosan (CS).
- To explore the potential of the developed hydrogel for applications in vascular and cartilage tissue engineering, and wearable devices.
Main Methods:
- A two-step method involving UV curing of PEGDA and CS followed by immersion in an anionic solution (citrate) was employed.
- The double-network hydrogel was constructed through ionic-covalent cross-linking and hydrogen bonding between PEGDA and CS.
- Mechanical properties, 3D printing capability, and electrical conductivity were characterized.
Main Results:
- The double-network hydrogel exhibited superior mechanical properties: elastic modulus (3.84 ± 0.4 MPa), tensile strength (7.23 ± 0.2 MPa), and tensile strain (162 ± 7%).
- The hydrogel demonstrated excellent 3D printing capability with precision, flexibility, and complex structure formation via extrusion.
- The material showed good electrical conductivity due to the presence of citrate ions in the ionic network.
Conclusions:
- The developed PEGDA-CS double-network hydrogel offers a promising combination of mechanical strength, toughness, printability, and conductivity.
- This novel hydrogel addresses the limitations of conventional hydrogels for advanced applications.
- The material shows significant potential for use in vascular engineering, cartilage tissue engineering, and wearable electronic devices.
