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Digital Light Processing 3D Printing of Enhanced Polymers via Interlayer Welding.

Guangda Zhu1, Yi Hou1, Jian Xu1,2

  • 1Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences (ICCAS), Beijing, 100190, P. R. China.

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Summary

Adding linear polymers to Digital Light Processing (DLP) 3D printing resins enhances mechanical properties without compromising printability. This simple method improves interlayer adhesion and strengthens printed objects for diverse applications.

Keywords:
3D printinglinear polymersmechanical properties

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Additive Manufacturing

Background:

  • Digital Light Processing (DLP) 3D printing offers high efficiency and resolution for complex structures.
  • However, DLP printing suffers from weak interlayer adhesion and anisotropic mechanical properties due to its layer-by-layer curing process.

Purpose of the Study:

  • To enhance the mechanical properties of DLP 3D printed objects.
  • To address the limitations of weak interlayer adhesion and anisotropy in DLP-fabricated parts.
  • To investigate a simple and effective method for improving material performance in DLP printing.

Main Methods:

  • Linear polymers, specifically polycaprolactone, were incorporated into commercial DLP resins.
  • 3D printed objects were fabricated using the modified resins via DLP.
  • Post-printing heat treatment was applied to facilitate polymer diffusion and entanglement between layers.
  • Mechanical properties, including tensile strength, were evaluated in various printing directions.

Main Results:

  • The addition of linear polymers effectively welded interlayers through diffusion and entanglement via heat treatment.
  • Incorporating 4.7 wt% polycaprolactone resulted in a ≈500% increase in tensile strength compared to neat samples.
  • The strategy improved both strengthening and toughening effects without negatively impacting DLP printability.
  • Enhanced mechanical properties were achieved across all printing directions, mitigating anisotropy.

Conclusions:

  • Introducing linear polymers into DLP resins is a viable strategy for improving the mechanical performance of 3D printed objects.
  • This method effectively enhances interlayer adhesion and material strength while maintaining DLP's resolution and efficiency.
  • The approach offers a simple yet powerful solution for producing high-performance parts via DLP 3D printing.