Effect of thermal modification of wood on the rheology, mechanical properties and dimensional stability of wood composite filaments and 3D-printed parts

Krapež Tomec, Daša (author), Schöflinger, Manfred (author), Leßlhumer, Jürgen (author), Žigon, Jure (author), Humar, Miha (author), Kariž, Mirko (author)

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.

• Language: English
• Keywords: wood-polylactic acid composite, 3D printing, thermally modified wood, dimensional stability, mechanical properties
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Publication date: 01.01.2024
• Year: 2024
• Number of pages: Str. 1-15
• Numbering: Vol. [sprejeto v objavo], iss. [sprejeto v objavo]
• PID: 20.500.12556/RUL-154538
• UDC: 630*8
• ISSN on article: 1748-0280
• DOI: 10.1080/17480272.2024.2316740
• COBISS.SI-ID: 186147843
• Publication date in RUL: 20.02.2024

Record is a part of a journal

• Title: Wood material science & engineering
• Shortened title: Wood mater. sci. eng
• Publisher: Taylor & Francis
• ISSN: 1748-0280
• COBISS.SI-ID: 522172953

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: les-PLA kompozit, 3D tisk, termično modificiran les, dimenzijska stabilnost, mehanske lastnosti

Projects

• Funder: ARIS - Slovenian Research and Innovation Agency
• Project number: P4-0015
• Name: Les in lignocelulozni kompoziti

• Funder: ARIS - Slovenian Research and Innovation Agency
• Project number: P4-0430
• Name: Gozdno-lesna veriga in podnebne spremembe: prehod v krožno biogospodarstvo