Functionalization of plastic parts by replication of variable pitch laser-induced periodic surface structures

Leonardo Piccolo, Marco Sorgato, Afif Batal, Stefan Dimov, Giovanni Lucchetta, Davide Masato*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)
149 Downloads (Pure)

Abstract

Surface functionalization of plastic parts has been studied and developed for several applications. However, demand for the development of reliable and profitable manufacturing strategies is still high. Here we develop and characterize a new process chain for the versatile and cost-effective production of sub-micron textured plastic parts using laser ablation. The study includes the generation of different sub-micron structures on the surface of a mold using femtosecond laser ablation and vario-thermal micro-injection molding. The manufactured parts and their surfaces are characterized in consideration of polymer replication and wetting behavior. The results of the static contact angle measurements show that replicated Laser-Induced Periodic Surface Structures (LIPSSs) always increase the hydrophobicity of plastic parts. A maximum contact angle increase of 20% was found by optimizing the manufacturing thermal boundary conditions. The wetting behavior is linked to the transition from a Wenzel to Cassie–Baxter state, and is crucial in optimizing the injection molding cycle time.
Original languageEnglish
Article number429
Number of pages15
JournalMicromachines
Volume11
Issue number4
DOIs
Publication statusPublished - 20 Apr 2020

Bibliographical note

Funding Information:
Funding: This work was supported by the University of Massachusetts Lowell (Provost Office Start-Up funds to Prof. Davide Masato).

Publisher Copyright:
© 2020 by the authors.

Keywords

  • laser-induced periodical surface structures
  • micro-injection molding
  • replication
  • surface wettability
  • Micro-injection molding
  • Replication
  • Surface wettability
  • Laser-induced periodical surface structures

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering
  • Control and Systems Engineering

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