20.500.12556/RUL-155263 Effect of thermal modification of wood particles for wood-PLA composites on properties of filaments, 3D-printed parts and injection moulded parts This paper describes the development and characterisation of wood-filled polylactic acid (PLA) composite filaments for application in fused filament fabrication three-dimensional (3D) printing. Four different wood-polymer composite filaments for 3D printing were prepared, and specimens were 3D-printed with the obtained materials. The composite filaments consisted of wood particles (10% or 20% mass ratio) and a PLA polymer matrix. Wood particles were prepared by grinding and sieving non-modified beech wood and thermally modified (TM) (at 200 °C) beech wood. Thermal modification of wood affected particle preparation and smaller particles with lower aspect ratios were obtained. Filaments with TM wood particles were extruded better than with non-modified wood particles, with lower surface roughness and lower porosity. With a higher wood ratio, the surface roughness and porosity of the filament increased. Non-homogenous filaments also affected extrusion in 3D printing and reduced the properties of 3D-printed parts. Parts 3D-printed from filaments with TM particles had better tensile strength than from filaments with non-modified particles, but were lower than from pure PLA filaments. The tensile strength of the injection-moulded specimens was 18–69% higher than that of the 3D-printed specimens, depending on the filament composition. The results indicate some positive effects of thermal modification of wood particles on the properties of filaments and 3D-printed parts. Nevertheless, further optimisation of particle preparation and extrusion parameters is needed to obtain quality filaments with this size of wood particles. wood-PLA composite 3D printing injection moulding thermally modified wood les-PLA kompoziti 3D tisk injekcijsko brizganje termično modificiran les filament true false true Angleški jezik Slovenski jezik Članek v reviji 2024-03-22 11:57:36 2024-03-22 11:57:39 2024-03-23 04:15:02 0000-00-00 00:00:00 2024 0 0 13 str. iss. 2 Vol. 82 2024 0000-00-00 NiDoloceno Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*8 1436-736X 10.1007/s00107-023-02018-2 179904515 RAZ_Krapez_Tomec_Dasa_2024.pdf RAZ_Krapez_Tomec_Dasa_2024.pdf 1 7CE3A831A4202CA12FF30ADBD47DDB8E e5683286dc9a69c022a83e82e6c11b52649773d376b30151e8ef4dbcdf3a66b2 6cc40493-e83d-11ee-b815-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=182077 https://link.springer.com/article/10.1007/s00107-023-02018-2 1 23f3ca1e-e83b-11ee-b815-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=182075 Biotehniška fakulteta 0 0 0