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Controlling the dynamics of elastomer networks with multivalent brush architectures
Michika Onoda1,2, Fei Jia1, Yukikazu Takeoka2
1Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA. rmacfarl@mit.edu.
Soft Matter
|May 9, 2022
Summary
This study introduces a new strategy for creating stronger, dynamic polymer networks using multivalent brush polymers. These novel elastomers show improved mechanical properties and lower energy for flow, paving the way for advanced soft materials.
Area of Science:
- Polymer Chemistry
- Materials Science
- Soft Matter Physics
Background:
- Dynamic polymer networks offer tunable mechanical properties.
- Brush polymers present unique architectural advantages over linear polymers.
- Metal-ion coordination is a key mechanism for crosslinking in dynamic polymer networks.
Purpose of the Study:
- To develop mechanically enhanced and dynamic polymer networks.
- To investigate the effect of multivalent brush architecture on network properties.
- To explore the potential of these materials in self-healing and 3D-printable applications.
Main Methods:
- Blending imidazole-functionalized linear poly(n-butyl acrylate) (PnBA) and multivalent brush poly(poly(n-butyl acrylate)) (PPnBA) with Zn(II) ions.
- Systematically varying the ratio of PnBA to PPnBA to create elastomers with different network topologies.
- Characterizing the thermal, rheological, and mechanical properties of the resulting polymer networks.
Main Results:
- Increasing the weight fraction of PPnBA enhanced melting temperature, plateau modulus, and relaxation time.
- A decrease in the activation energy of flow (Ea) was observed with increasing PPnBA content, despite improved mechanical properties.
- Multivalent brush polymers enabled higher crosslinking density compared to linear polymers, even with lower imidazole content.
Conclusions:
- The multivalent brush architecture is crucial for achieving enhanced mechanical properties and reduced flow activation energy in dynamic polymer networks.
- This design strategy offers a promising route for creating advanced soft materials with tailored properties.
- The developed elastomers hold significant potential for applications in self-healing and 3D-printable technologies.
