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Superstretchable and Processable Silicone Elastomers by Digital Light Processing 3D Printing.

Tingting Zhao1,2, Ran Yu1, Shan Li3

  • 1Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China.

ACS Applied Materials & Interfaces
|March 27, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed new 3D printable silicone elastomers using digital light processing. These super-stretchable materials exhibit high resolution and excellent mechanical properties, with potential for advanced applications.

Keywords:
3D printingdigital light processingsilicone elastomerssuperstretchablethiol−ene click reaction

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Additive Manufacturing

Background:

  • Digital Light Processing (DLP) 3D printing enables complex object fabrication.
  • Silicone elastomers offer unique properties but often lack high stretchability in printed forms.
  • Thiol-ene click chemistry provides efficient network formation for polymers.

Purpose of the Study:

  • To develop novel photosensitive resins for DLP 3D printing of silicone elastomers.
  • To achieve tunable mechanical properties, including high stretchability, in printed silicone elastomers.
  • To explore the application of these super-stretchable elastomers in fabricating stretchable electronics.

Main Methods:

  • Synthesized photosensitive resins based on thiol-ene click reaction.
  • Utilized branched mercaptan-functionalized polysiloxane and vinyl-terminated poly(dimethylsiloxane) of varying molecular weights.
  • Employed digital light processing (DLP) 3D printing to fabricate silicone elastomer objects.
  • Characterized the mechanical properties, including break elongation, of the printed elastomers.
  • Integrated the elastomers with carbon nanotubes-doped hydrogel for stretchable electronics fabrication.

Main Results:

  • Successfully produced silicone elastomers with tunable hardness and mechanical properties via DLP 3D printing.
  • Achieved high printing resolution and excellent mechanical performance in the printed elastomeric objects.
  • Demonstrated a remarkable break elongation of up to 1400% for the silicone elastomers.
  • The developed elastomers exhibit superior stretchability compared to existing UV-cured and thermocuring silicone elastomers.
  • Fabricated functional stretchable electronics using the super-stretchable silicone elastomers.

Conclusions:

  • The developed photosensitive silicone elastomers are highly printable and processable using DLP.
  • The thiol-ene click chemistry approach allows for precise control over elastomer properties, achieving unprecedented stretchability.
  • These super-stretchable silicone elastomers hold significant promise for applications in soft robotics, flexible actuators, and medical implants.