Přístupnostní navigace
E-application
Search Search Close
Master's Thesis
Author of thesis: Ing. Jiří Lednický
Acad. year: 2025/2026
Supervisor: Ing. Ladislav Chladil, Ph.D.
Reviewer: Ing. Pavel Šafl
This master’s thesis focuses on the preparation and evaluation of ceramic–polymer composite filaments based on PLA (polylactic acid) and TPU (thermoplastic polyurethane) intended for additive manufacturing using the FDM (Fused Deposition Modeling) method, with emphasis on potential biomedical applications. The aim of the work was to optimize the extrusion process, prepare a series of composite filaments, evaluate filler homogenization and dispersion, and fabricate TPU-based sensor structures suitable for biomedical applications. Composite filaments were produced using a laboratory extruder and subsequently characterized by means of µCT and ESEM analyses. Sensor structures were fabricated by FDM printing using a hardened nozzle on a modified FR-4 substrate. Mechanical loading of the sensors was carried out using a stepper press, while capacitive response measurements were performed using an LCR meter. The results confirmed the capability of the laboratory extruder to prepare composite filaments with relatively homogeneous filler dispersion. PLA-based composites achieved sufficient dimensional stability for FDM printing up to a filler content of 5 wt. %, although signs of material degradation were observed during processing. TPU-based composites containing up to 5 wt. % filler exhibited significant shape instability but showed no evidence of degradation. In addition, ceramic fillers positively influenced the capacitive response of the printed sensors. The composite sensor designated C4 exhibited a capacitive response up to 34 % higher compared to the sensor fabricated from pure TPU. The work demonstrates the feasibility of preparing ceramic–polymer composite filaments using laboratory extrusion and confirms the potential of TPU-based composites for the fabrication of FDM-printed capacitive sensors.
FDM, additive manufacturing, 3D printing, filament, extrusion, extruder, ceramic–polymer composite, composite filament, PLA, TPU, hydroxyapatite, titanium dioxide, barium titanate, filler dispersion, homogenization, biocompatibility, biomedicine, tissue engineering, tissue scaffold anthropomorphic simulator, flexible sensors, capacitive pressure sensors, wearable electronics, capacitive response, relative permitivity
Date of defence
09.06.2026
Result of the defence
Defended (thesis was successfully defended)
Grading
A
Process of defence
Student seznámil státní zkušební komisi s cíli a řešením závěrečné vysokoškolské práce a zodpověděl otázky a připomínky oponenta. Otázky: - Co považujete za největší přínost této práce? - Vícenásobná extruze není optimální metoda homogeniczace. Jak tato metoda může ovlivňovat vlastnosti a výsledky Vašeho měření?
Language of thesis
Czech
Faculty
Fakulta elektrotechniky a komunikačních technologií
Department
Department of Electrical and Electronic Technology
Study programme
Electrical Manufacturing and Management (MPC-EVM)
Composition of Committee
doc. Ing. Petr Vyroubal, Ph.D. (místopředseda) Ing. Ladislav Chladil, Ph.D. (člen) Ing. Pavel Čudek, Ph.D. (člen) Ing. Zdenka Rozsívalová (člen) prof. Ing. Jiří Kazelle, CSc. (předseda) Ing. Jiří Báňa (člen) Ing. David Trochta (člen)
Supervisor’s reportIng. Ladislav Chladil, Ph.D.
Grade proposed by supervisor: A
Reviewer’s reportIng. Pavel Šafl
Grade proposed by reviewer: B
Responsibility: Mgr. et Mgr. Hana Odstrčilová