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Understanding silicone elastomer curing and adhesion for stronger soft devices.

Te Faye Yap1,2, Jasmine Klinkao1, Sofia Urbina1

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Researchers developed a new framework to control adhesion in silicone elastomers for soft machines and biomedical devices. This method optimizes interfacial adhesion, improving robotic actuator performance and 3D-printed part strength.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Robotics

Background:

  • Silicone elastomers are crucial for biomedical devices and soft machines due to their flexibility and biocompatibility.
  • Current fabrication methods struggle to control interfacial adhesion, especially across varying temperatures.
  • Robust interfaces are essential for reliable soft-robotic and biomedical device performance.

Purpose of the Study:

  • To introduce a predictive framework for interfacial adhesion in silicone elastomers.
  • To establish a relationship between adhesion strength, time, and temperature.
  • To enable the design of robust soft materials and devices with enhanced interfacial properties.

Main Methods:

  • Development of a dimensionless reaction coordinate linking time and temperature to adhesion.
  • Experimental validation using silicone elastomer fabrication.
  • Fabrication of elastomeric robotic actuators and 3D printed parts using direct ink writing.

Main Results:

  • A framework predicting the transition from bulk to adhesive failure was established.
  • Elastomeric robotic actuators showed a 50% increase in curvature.
  • 3D printed parts demonstrated over 200% improvement in interlayer adhesion.

Conclusions:

  • The developed framework effectively optimizes interfacial adhesion in silicone elastomers.
  • This approach enhances the performance and durability of soft materials and devices.
  • The study provides a valuable tool for diverse fabrication strategies in soft robotics and biomedical engineering.