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Silicone boronates reversibly crosslink using Lewis acid-Lewis base amine complexes
Laura Dodge1, Yunqing Chen, Michael A Brook
1Department of Chemistry and Chemical Biology, McMaster University, 1280 Main St. W., Hamilton ON, L8S 4M1 (Canada).
Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 3, 2014
Summary
Researchers developed recyclable silicone elastomers using reversible amine-boronate chemistry. This approach allows for dynamic B-N bond reformation, enabling material disassembly and reformation for sustainable applications in silicone materials.
Area of Science:
- Polymer Chemistry
- Materials Science
- Supramolecular Chemistry
Background:
- Traditional silicone elastomers are thermosets, limiting their recyclability and repurposing.
- Existing thermoplastic silicones rely on less robust reversible covalent or non-covalent interactions.
- Developing sustainable alternatives for silicone materials is crucial.
Purpose of the Study:
- To introduce a novel method for creating reversible crosslinked silicone elastomers.
- To explore the use of amine-boronate complex formation for dynamic silicone networks.
- To demonstrate the recyclability and reformability of these novel silicone materials.
Main Methods:
- Synthesized silicone elastomers functionalized with amine and boronate groups.
- Characterized network structures using Shore-hardness, swelling, and rheological analyses.
- Investigated dynamic bond reformation via B-N interactions at elevated temperatures (60°C).
Main Results:
- Successfully created reversible crosslinked silicone networks through amine-boronate complexation.
- Demonstrated that compressive stress can be relieved via dynamic B-N bond reformation at 60°C.
- Showcased full material disassembly with n-butylamine and successful reformation upon its removal.
Conclusions:
- Amine-boronate complexation offers a straightforward and adaptable route to recyclable silicone elastomers.
- The dynamic nature of B-N bonds allows for stress relaxation, disassembly, and reformation.
- This method provides a promising pathway towards sustainable silicone materials with enhanced end-of-life options.
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