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Open AccessArticle

Picosecond Laser Ablation of Polyhydroxyalkanoates (PHAs): Comparative Study of Neat and Blended Material Response

1
Physics of Surfaces and Materials Unit, TEKNIKER, Iñaki Goenaga 5, 20600 Eibar, Spain
2
Applied Biotechnology Research Group, Department of Life Sciences, Faculty of Science and Technology, University of Westminster, London W1W 6UW, UK
3
Department of Materials Science and Engineering, University of Sheffield, North Campus, Broad Lane, Sheffield S3 7HQ, UK
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(1), 127; https://doi.org/10.3390/polym12010127
Received: 29 November 2019 / Revised: 18 December 2019 / Accepted: 20 December 2019 / Published: 5 January 2020
(This article belongs to the Special Issue Laser Processing of Polymer Materials)
Polyhydroxyalkanoates (PHAs) have emerged as a promising biodegradable and biocompatible material for scaffold manufacturing in the tissue engineering field and food packaging. Surface modification is usually required to improve cell biocompatibility and/or reduce bacteria proliferation. Picosecond laser ablation was applied for surface micro structuring of short- and medium-chain length-PHAs and its blend. The response of each material as a function of laser energy and wavelength was analyzed. Picosecond pulsed laser modified the surface topography without affecting the material properties. UV wavelength irradiation showed halved ablation thresholds compared to visible (VIS) wavelength, revealing a greater photochemical nature of the ablation process at ultraviolet (UV) wavelength. Nevertheless, the ablation rate and, therefore, ablation efficiency did not show a clear dependence on beam wavelength. The different mechanical behavior of the considered PHAs did not lead to different ablation thresholds on each polymer at a constant wavelength, suggesting the interplay of the material mechanical parameters to equalize ablation thresholds. Blended-PHA showed a significant reduction in the ablation threshold under VIS irradiation respect to the neat PHAs. Picosecond ablation was proved to be a convenient technique for micro structuring of PHAs to generate surface microfeatures appropriate to influence cell behavior and improve the biocompatibility of scaffolds in tissue engineering. View Full-Text
Keywords: polyhydroxyalkanoates (PHAs); picosecond pulsed laser ablation; surface micro structuring polyhydroxyalkanoates (PHAs); picosecond pulsed laser ablation; surface micro structuring
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MDPI and ACS Style

Ortiz, R.; Basnett, P.; Roy, I.; Quintana, I. Picosecond Laser Ablation of Polyhydroxyalkanoates (PHAs): Comparative Study of Neat and Blended Material Response. Polymers 2020, 12, 127.

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