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Updated: Sep 5, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
Published on: December 16, 2022
Orthogonally deconstructable and depolymerizable polysilylethers via entropy-driven ring-opening metathesis
Alayna M Johnson1, Keith E L Husted1, Landon J Kilgallon1
1Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA. jaj2109@mit.edu.
Researchers developed new deconstructable polysilylethers using entropy-driven ring-opening metathesis polymerization. These polymers exhibit low glass transition temperatures and can be rapidly broken down using specific triggers.
Area of Science:
- Polymer Chemistry
- Materials Science
- Organic Synthesis
Background:
- Ring-opening metathesis polymerization (ROMP) is a versatile method for polymer synthesis.
- Developing polymers with tunable properties and controlled degradation is crucial for advanced applications.
- Cyclic silyl ether monomers offer unique structural possibilities for polymer design.
Purpose of the Study:
- To synthesize novel polysilylethers utilizing entropy-driven ring-opening metathesis polymerization (ED-ROMP).
- To investigate the thermal properties, deconstructability, and microstructure of the synthesized polymers.
- To explore the potential applications of this new class of deconstructable polymers.
Main Methods:
- Entropy-driven ring-opening metathesis polymerization (ED-ROMP) of cyclic bifunctional silyl ether-based monomers.
- Characterization of polymer thermal stability and glass transition temperature (Tg).
- Investigation of deconstruction mechanisms using acid, fluoride, and metathesis catalysts.
Main Results:
- Successful synthesis of novel polysilylethers with good thermal stability.
- Achieved ultra-low glass transition temperature (Tg) of -88 °C.
- Demonstrated rapid deconstruction via silicon-oxygen bond cleavage and partial depolymerization.
Conclusions:
- ED-ROMP provides a new route to polysilylethers with desirable properties.
- The synthesized polymers are rapidly deconstructable, offering environmental and recycling advantages.
- The regiorandom nature of the ED-ROMP process was elucidated, providing insights into polymer microstructure.
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