Formation of porous networks on polymeric surfaces by femtosecond laser micromachining

Youssef Assaf; Anne-Marie Kietzig

doi:10.1117/12.2250358

17 February 2017 Formation of porous networks on polymeric surfaces by femtosecond laser micromachining

Youssef Assaf, Anne-Marie Kietzig

Proceedings Volume 10092, Laser-based Micro- and Nanoprocessing XI; 100920X (2017) https://doi.org/10.1117/12.2250358
Event: SPIE LASE, 2017, San Francisco, California, United States

Abstract

In this study, porous network structures were successfully created on various polymer surfaces by femtosecond laser micromachining. Six different polymers (poly(tetrafluoroethylene) (PTFE), poly(methyl methacrylate) (PMMA), high density poly(ethylene) (HDPE), poly(lactic acid) (PLA), poly(carbonate) (PC), and poly(ethylene terephthalate) (PET)) were machined at different fluences and pulse numbers, and the resulting structures were identified and compared by lacunarity analysis. At low fluence and pulse numbers, porous networks were confirmed to form on all materials except PLA. Furthermore, all networks except for PMMA were shown to bundle up at high fluence and pulse numbers. In the case of PC, a complete breakdown of the structure at such conditions was observed. Operation slightly above threshold fluence and at low pulse numbers is therefore recommended for porous network formation. Finally, the thickness over which these structures formed was measured and compared to two intrinsic material dependent parameters: the single pulse threshold fluence and the incubation coefficient. Results indicate that a lower threshold fluence at operating conditions favors material removal over structure formation and is hence detrimental to porous network formation. Favorable machining conditions and material-dependent parameters for the formation of porous networks on polymer surfaces have thus been identified.

Citation Download Citation

Youssef Assaf and Anne-Marie Kietzig "Formation of porous networks on polymeric surfaces by femtosecond laser micromachining", Proc. SPIE 10092, Laser-based Micro- and Nanoprocessing XI, 100920X (17 February 2017); https://doi.org/10.1117/12.2250358

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