Journal of Thermal Analysis and Calorimetry

, Volume 132, Issue 2, pp 955–965 | Cite as

Ultraviolet nanosecond laser ablation behavior of silver nanoparticle and melamine–formaldehyde resin-coated short sisal fiber-modified PLA composites

  • Jiratti Tengsuthiwat
  • Suchart Siengchin
  • Richárd Berényi
  • József Karger-Kocsis


Nd:YAG laser (355 nm) induced surface modifications in polylactic acid (PLA), and its composites with silver nanoparticles (AgNPs, size range between 120 and 150 nm) with and without additional melamine–formaldehyde-coated short sisal fibers were studied as a function of laser pulse numbers. The AgNP content was varied (100, 300 and 500 ppm), whereas the sisal content kept as constant (9 mass%). The PLA-based systems with a fully amorphous matrix were irradiated with 1–256 laser pulses at a constant fluence of 0.32 µJ µm−2. Changes in the irradiated surfaces were assessed and quantified by light and scanning electron microscopic pictures. Protrusion with bubbling, bubbled protrusion with cratering and crater formation with more or less bubbled ridges were found as characteristic ablation features. Bubbling was traced to entrapped gaseous products of PLA degradation, while the onset of ridges was ascribed to the melt flow of the PLA matrix caused by laser shock waves. The laser irradiation caused damage and ablation highly depended on the actual composition, which influenced the UV absorption at 355 nm, which was measured as well.


Polylactic acid (PLA) Laser ablation Silver nanocomposite Sisal reinforcement Thermooxidative degradation 



This research was supported by the Thailand Research Fund through the Royal Golden Jubilee PhD Program (Grant No. PHD/0188/2557 to J.T. and S.C.) and by the King Mongkut’s University of Technology North Bangkok (Grant No. KMUTNB-61-KNOW-002).


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Production Engineering Department, The Sirindhorn International Thai-German Graduate School of Engineering (TGGS)King Mongkut’s University of Technology North BangkokBangkokThailand
  2. 2.Department of Electronics Technology, Faculty of Electrical Engineering and InformaticsBudapest University of Technology and EconomicsBudapestHungary
  3. 3.Department of Polymer Engineering, Faculty of Mechanical EngineeringBudapest University of Technology and EconomicsBudapestHungary

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