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Summary

Covalent adaptable networks (CANs) exhibit tunable stress relaxation kinetics influenced by dynamic exchange reactions. This study quantifies the interplay between Arrhenius behavior and diffusion in thiol-ene CANs, enabling novel sensor applications.

Keywords:
DLP 3D printingcovalent adaptable networkmodelingmultimaterialstress relaxation

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Area of Science:

  • Polymer Science
  • Materials Science
  • Chemical Engineering

Background:

  • Covalent adaptable networks (CANs) are dynamic polymer networks with tunable properties.
  • Dynamic exchange reactions enable malleability, weldability, and recyclability in CANs.
  • Kinetics of exchange reactions are influenced by dynamic link concentration and diffusion.

Purpose of the Study:

  • Investigate the exchange dynamics in photocurable thiol-ene CANs.
  • Quantify the contributions of Arrhenius behavior and Rouse diffusion to stress relaxation.
  • Explore the potential of these materials as temperature-time sensors.

Main Methods:

  • Studied thiol-thioester exchange mechanism in thiol-ene CANs.
  • Utilized dual-vat multimaterial DLP 3D printing to create diverse materials.
  • Evaluated creep performance and stress relaxation kinetics.

Main Results:

  • Demonstrated tunable stress relaxation kinetics by varying dynamic link concentration.
  • Identified the interplay between Arrhenius-like behavior and diffusion-controlled processes.
  • Successfully fabricated multimaterial samples with distinct mechanical responses.

Conclusions:

  • Thiol-ene CANs offer tunable mechanical properties through controlled dynamic exchange.
  • Understanding the balance between kinetic and diffusion factors is crucial for material design.
  • Multimaterial CANs can function as effective thermal-time sensors via thermal imprinting.