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The fabrication of micrometric structures on injection moulds to reproduce functional surfaces is of great interest in the field of polymer injection. Functionalities such as hydrophilicity, hydrophobicity or bacterial adhesion repellence are among the many possibilities. In this work, austenitic stainless steel used as mold inserts and polypropylene (PP) injected parts were structured with Laser Induced Periodic Surface Structuration (LIPSS). PP parts were injected with the lasered mold inserts as well and compared to the directly laser-treated ones. The laser sources used were a chirped pulse amplification femtosecond laser emitting 270fs pulses at a wavelength of 1030nm and a Q-switched laser system delivering 7ns at a wavelength of 355nm. The first one was used on the stainless steel and the second on the polypropylene, in order to reproduce similar textures. Next, static water contact angle (WCA) was analysed with deionized water droplets on the structured areas of the PP parts. The topography of the structured areas was investigated using optical confocal microscopy. Compositional and structural modifications on the materials were studied by means of micro-Raman spectroscopy.
Abstract
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Poster
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