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Area of Science:

  • Polymer Science
  • Materials Science
  • Additive Manufacturing

Background:

  • Material extrusion 3D printing (ME3DP), including fused deposition modeling (FDM), is a versatile additive manufacturing technique for complex geometries.
  • Developing new polymeric materials compatible with ME3DP remains a significant challenge.
  • Thermoplastic elastomers (TPEs) offer unique properties but require careful material design for 3D printing.

Purpose of the Study:

  • To develop ME3DP-compatible thermoplastic elastomeric (TPE) materials from polypropylene (PP) and styrene-(ethylene-butylene)-styrene (SEBS) block copolymers.
  • To investigate the properties of 3D printed TPEs and compare them with injection-molded counterparts.
  • To understand the relationship between morphology and properties in PP/SEBS blends for additive manufacturing.

Main Methods:

  • A straightforward blending approach was used to create tailorable PP/SEBS TPE materials.
  • Material extrusion 3D printing (ME3DP) was employed to fabricate samples.
  • Properties of 3D printed TPEs were compared to injection-molded samples using mechanical testing and rheological analysis.
  • Phase morphologies were analyzed and correlated with material properties.
  • Carbon black was incorporated as a reinforcing agent to enhance mechanical performance.

Main Results:

  • 3D printed TPEs exhibited lower tensile strength and Young's modulus compared to injection-molded samples.
  • No significant differences were observed in melt rheological properties at high frequencies or in dynamic mechanical behavior between 3D printed and injection-molded TPEs.
  • Incorporating carbon black at lower loadings effectively balanced elastomeric and mechanical properties in 3D printed TPEs.
  • The preferential location of carbon black within blend phases was theoretically predicted using wetting parameters.

Conclusions:

  • ME3DP-compatible PP/SEBS TPE materials can be successfully developed through a simple blending approach.
  • The study provides insights into the morphology-property relationships crucial for optimizing TPEs in additive manufacturing.
  • Carbon black reinforcement offers a viable strategy to enhance the mechanical performance of 3D printed TPEs while maintaining elastomeric characteristics.