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Star-Polymer-DNA Gels Showing Highly Predictable and Tunable Mechanical Responses
Masashi Ohira1, Takuya Katashima1, Mitsuru Naito2
1Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8685, Japan.
Advanced Materials (Deerfield Beach, Fla.)
|January 16, 2022
Summary
New DNA gels built with star-polymer-DNA precursors exhibit predictable, tunable mechanical properties. These dynamically crosslinked materials demonstrate self-healing and hysteresis-less behavior, ideal for advanced applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Dynamically crosslinked gels are materials with time-dependent mechanical properties.
- DNA duplexes offer tunable crosslinking but often result in unpredictable gel behavior.
- Developing gels with predictable mechanics is crucial for advanced applications.
Purpose of the Study:
- To create a DNA gel with a homogeneous network and predictable mechanical responses.
- To utilize star-polymer-DNA precursors with presimulated DNA sequences for controlled gel formation.
- To investigate the relationship between DNA crosslinker thermodynamics and macroscopic gel properties.
Main Methods:
- Synthesis of star-polymer-DNA precursors with specific DNA sequences.
- Melting curve analysis to validate DNA crosslinker thermodynamics.
- Stress-relaxation tests and dissociation kinetics to determine mechanical properties.
- Durability tests under thermal and mechanical stimuli.
Main Results:
- The DNA gel exhibited a homogeneous network and predictable mechanical behavior.
- Melting curve analysis confirmed the correspondence between DNA crosslinker thermodynamics and simulations.
- Macroscopic relaxation time matched DNA crosslinker lifetime across four orders of magnitude.
- The gels demonstrated hysteresis-less and self-healable properties under repeated stimuli.
Conclusions:
- Star-polymer-DNA precursors enable the creation of gels with predictable and tunable viscoelastic properties.
- These gels possess excellent durability, including self-healing capabilities.
- The developed materials show significant potential for applications like stress-response matrices, injectable solids, and soft robotics.
