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Researchers developed new biodegradable and recyclable elastomers from bio-based polymers. These advanced materials offer thermal reprocessability and end-of-life recyclability for sustainable applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biotechnology

Background:

  • Cross-linked elastomers are typically non-recyclable and non-biodegradable.
  • Medium-chain-length polyhydroxyalkanoates (mcl-PHAs) are bio-based polymers with potential for biodegradable elastomers.
  • Covalent adaptable networks offer a route to recyclable thermosets through dynamic covalent bond rearrangement.

Purpose of the Study:

  • To develop biodegradable and recyclable elastomers by integrating covalent adaptable networks into mcl-PHAs.
  • To utilize biologically produced mcl-PHAs with specific chemical handles for creating novel materials.
  • To create PHA-based vitrimers with enhanced environmental properties.

Main Methods:

  • Engineered *Pseudomonas putida* to produce mcl-PHAs with pendent terminal alkenes.
  • Employed thiol-ene chemistry to incorporate boronic ester (BE) cross-links.
  • Characterized the resulting PHA-based vitrimers for mechanical properties and recyclability.

Main Results:

  • Successfully created PHA-based vitrimers by cross-linking mcl-PHAs with boronic esters.
  • Achieved a soft, elastomeric material at low cross-link density (<6 mole %).
  • Demonstrated thermal reprocessability, biodegradability, and denetworking capabilities.

Conclusions:

  • Developed novel biodegradable and recyclable elastomers from mcl-PHAs.
  • The PHA-based vitrimers exhibit properties suitable for adhesives, soft robotics, and electronics.
  • This work presents a sustainable alternative to conventional cross-linked elastomers.