Making Highly Elastic and Tough Hydrogels from Doughs
Guodong Nian1, Junsoo Kim1, Xianyang Bao1,2
1John A. Paulson School of Engineering and Applied Sciences, Kavli Institute for Bionano Science and Technology, Harvard University, Cambridge, MA, 02138, USA.
Advanced Materials (Deerfield Beach, Fla.)
|September 20, 2022
Summary
This study introduces a novel dough-based method for creating tough, swell-resistant hydrogels. By densely entangling polymer chains before sparse crosslinking, these advanced hydrogels overcome traditional brittleness limitations.
Area of Science:
- Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Traditional hydrogels are fabricated via covalent crosslinking, resulting in networks that are swell-resistant but inherently brittle.
- A key challenge in hydrogel fabrication is balancing swell-resistance with mechanical toughness.
Purpose of the Study:
- To develop a novel method for fabricating hydrogels that are simultaneously swell-resistant, tough, and elastic.
- To overcome the brittleness typically associated with conventional crosslinking techniques.
Main Methods:
- A hydrogel precursor dough is formed by mixing long polymer chains with water and a photoinitiator.
- The dough undergoes kneading and annealing to achieve dense polymer chain entanglement.
- Sparse covalent crosslinking is induced via UV irradiation, followed by swelling to equilibrium.
Main Results:
- The resulting hydrogels exhibit exceptional toughness and swell-resistance, resolving the traditional conflict.
- These novel hydrogels demonstrate near-perfect elasticity, high strength, and superior fatigue resistance.
- The method was successfully demonstrated using poly(ethylene glycol) and cellulose, yielding unprecedented properties for these polymers.
Conclusions:
- The dough-based fabrication method offers a new paradigm for creating high-performance hydrogels.
- This approach is broadly applicable to various synthetic and natural polymers and compatible with industrial processes.
- The developed hydrogels present opportunities for sustainable, advanced material applications.
