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3D Printed Silicones with Shape Memory.

Amanda S Wu1, Ward Small Iv2, Taylor M Bryson3

  • 1Lawrence Livermore National Laboratory, Materials Engineering Division, Livermore, CA, 94550, USA. wu36@llnl.gov.

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|July 7, 2017
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Summary
This summary is machine-generated.

Direct ink writing creates porous structures. Varying microsphere glass transition temperature (Tg) impacts mechanical properties and shape recovery, offering potential for complex shape memory polymers.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Additive Manufacturing

Background:

  • Direct ink writing (DIW) is a 3D printing technique for fabricating ordered, porous structures.
  • The mechanical properties of DIW structures are influenced by their architecture and the constituent materials.
  • Pore formers are crucial for creating porosity and tailoring material properties.

Purpose of the Study:

  • To investigate the effect of microsphere shell stiffness and glass transition temperature (Tg) on the compressive behavior and compression set of siloxane-based DIW structures.
  • To evaluate the potential of polymer microspheres as pore formers in creating functional materials with tunable mechanical responses.

Main Methods:

  • Direct ink writing (DIW) was used to fabricate siloxane matrix structures incorporating two types of gas-filled polymer microspheres with different shell stiffness and Tg.
  • Compressive testing was performed on the printed structures.
  • Thermal analysis was conducted to evaluate the glass transition temperature (Tg) and its effect on structural recovery.

Main Results:

  • Structures with lower Tg microspheres exhibited significant compression set when heated near or above their Tg, but showed full structural recovery upon reheating without constraint.
  • Structures incorporating higher Tg microspheres demonstrated reduced compression set and no recovery upon reheating.
  • The shell stiffness and Tg of the microspheres were identified as key parameters influencing the mechanical behavior and shape memory effects.

Conclusions:

  • Polymer microspheres can be effectively used as pore formers in DIW to tune the mechanical properties of printed structures.
  • The differential compression set and recovery behavior based on microsphere Tg highlight their potential for developing advanced materials.
  • These findings suggest that polymer microspheres are promising candidates for creating complex shape memory elastomers with potential applications in tandem shape memory polymer systems.