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Modification of medical-grade poly(L-lactide) using femtosecond laser filamentation

Wednesday (24.06.2020)
13:55 - 13:58 Room 1
Part of:
- Poster Periodic microstructuring of metal moulds using direct laser interference patterning for nanoimprint replication 1 Dr. Marcos Soldera
- Poster Comparison of structural colors achieved by laser induced periodic surface structures and direct laser interference patterning 1 Dr. Marcos Soldera
- Poster *student* Wetting properties of the aluminium surface structures fabricated using Direct Laser Interference Patterning with picosecond and femtosecond pulses 1 Dipl.-Ing. Stephan Milles
- Poster The numerical realization of a model of interaction of ultrashort laser pulses with solid 1 Prof. Vladimir Zhukov
- Poster On the problem of the initial conditions for tightly-focused ultrashort laser pulses in the modeling of laser beam propagation in transparent solids 1 Prof. Vladimir Zhukov
- Poster Innovative polymer coating systems – applied by laser sintering technique 1 Dr. Anna Buling
- Poster Tangential laser turning of fused silica usin ultra-short laser pulses 1 Julian Zettl
- Poster Process optimization of Direct Laser Interference Patterning 1 Dr. Bogdan Voisiat
- Poster Dynamic aberration correction via spatial light modulator (SLM) for femtosecond direct laser writing 1 Gabrielius Kontenis
- Poster Modification of metal nanoparticles via femtosecond laser pulses and their application for SERS 1 Dr. Asta Tamuleviciene
- Poster Ultraviolet and Infrared Femtosecond Laser Irradiation of Thermoplastics PET and PA66 1 Dr. Xxx Sedao
- Poster High pulse energy femtosecond laser machining station for the interference and parallel processing 1 Dr. Simonas Indrisiunas
- Poster Laser material processing with a multi-beam setup based on Excited State Absorption 1 Sebastian Engel
- Poster GO-neutral red nanocomposite reduction by pulsed laser irradiation 1 Dr. Romualdas Trusovas
- Poster *student* Numerical simulation of energy relaxation in Mo thin films exposed to femtosecond laser pulse 1 Kryštof Hlinomaz
- Poster Modification of medical-grade poly(L-lactide) using femtosecond laser filamentation 1 Dr. Bogusz Stepak
Session Chair

Session PS: Poster Session 02
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Topic PS: Poster Session

We report filamentation-assisted laser modification of medical – grade bioresorbable poly(L-lactide) (PLLA) which is frequently used for bone and cardiovascular implants fabrication. The aim of the research was to determine the influence of spatial distribution of filamentary modifications on polymer properties. For this purpose we used TruMicro 2000 laser from Trumpf Laser GmbH. For current research we applied fundamental wavelength and shortest pulse of 270 fs. The pulse energy was adjusted in order to obtain possibly long single filamentary modifications caused by a single laser pulse. We fabricated three types of samples with filament spacing of 15, 30 and 50 µm in both directions. After modification samples were analysed by means of differential scanning calorimetry (DSC) that enables evaluation of thermal and crystallization behaviour of material. We present for the first time polymer thermal properties modification by generation of elongated microcavities using very fast method based on galvoscanner. Obtained microchannels have the length of 300 – 350 µm and diameter of around 1 µm. Filamentation tracks starts at the surface and ends close to the sample bottom. We discovered that filamentary modifications act as crystallization nuclei and cause increased ability of polymer to crystallize at lower temperature. The higher modification density the faster crystallization observed in DSC curves. This result is promising as a method of spatially selective modification and gradient properties writing. Drug insertion into the microcavities may be also possible.

Dr. Bogusz Stepak
Wroclaw University of Science and Technology
Additional Authors:
  • Dr. Małgorzata Gazińska
    Wrocław University of Science and Technology
  • Anna Krokos
    Wrocław University of Science and Technology
  • Dr. Aleksander Budnicki
    Trumpf Laser GmbH
  • Dr. Konrad Szustakiewicz
    Wrocław University of Science and Technology
  • Dr. Arkadiusz Antończak
    Wroclaw University of Science and Technology


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