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Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps.

Felix Bouchard1, Marcos Soldera1,2, Robert Baumann1

  • 1Institut für Fertigungstechnik, Technische Universität Dresden, George-Baehr-Str. 3c, 01069 Dresden, Germany.

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Summary

Researchers created hierarchical microstructures on plastic (PET) using laser writing and hot embossing. This novel technique enhances surface properties, significantly increasing water contact angles for functionalized plastic applications.

Keywords:
direct laser interference patterningdirect laser writinghierarchical structureshot embossingpolyethylene terephthalatepolymerstainless steelwater contact angle

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Polymer Science

Background:

  • Increasing demand for functionalized plastics requires advanced surface modification techniques.
  • Hot embossing offers an industry-compatible method for polymer surface structuring.
  • Laser-based methods enable precise micro- and nanostructuring for tailored material properties.

Purpose of the Study:

  • To develop an industry-compatible strategy for creating hierarchical microstructures on polyethylene terephthalate (PET).
  • To investigate the accurate transfer of these hierarchical textures to PET foils via hot embossing.
  • To evaluate the impact of hierarchical surface patterns on the wettability of PET.

Main Methods:

  • Fabrication of a stainless steel stamp master using three laser-based steps: Direct Laser Writing (DLW) for dimples, laser remelting for smoothing, and Direct Laser Interference Patterning (DLIP) for hole-like substructures.
  • Hot embossing of PET foils using the structured stainless steel stamp under controlled temperature and pressure.
  • Characterization of transferred microstructures using optical confocal microscopy and scanning electron microscopy (SEM).
  • Wettability assessment using a drop shape analyzer to determine water contact angles.

Main Results:

  • Hierarchical microstructures were successfully fabricated on the stainless steel stamp and accurately transferred to PET foils.
  • Optical and SEM analyses confirmed the fidelity of the transferred hierarchical textures.
  • Wettability studies demonstrated significantly increased water contact angles on textured PET surfaces compared to untreated PET.
  • The highest water contact angle reached was 105°, a substantial increase from the 77° of untreated PET.

Conclusions:

  • The developed laser-based structuring and hot embossing process enables the efficient production of hierarchical microstructures on PET.
  • Hierarchical surface texturing significantly enhances the hydrophobicity of PET surfaces.
  • This approach provides a viable industrial solution for producing functionalized plastic surfaces with tailored wettability.