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 study investigates the effects of thermal modification (TM) on wood-filled polylactic acid composite filaments for 3D printing. Nine composite formulations with different wood content were analysed. The wood particles came from unmodified and thermally modified beech wood (180 °C or 200 °C). The results showed that the incorporation of thermally modified (TMd) wood changed the filament properties, resulting in lower density and reduced surface roughness. The 3D-printed parts with TMd wood particles had a higher water contact angle, higher storage modulus, lower glass transition temperature, higher modulus of elasticity and higher indentation hardness. However, the tensile strength of the 3D-printed parts decreases, even though the results of parts with TMd wood showed higher strength compared to unmodified wood at the same filler content. Surprisingly, TMd wood had no effect on water absorption under humid conditions. Scanning electron micrographs showed improved interfacial adhesion between TMd wood particles and PLA, with smaller voids in the filament compared to filaments with unmodified wood particles. The study suggests that further research into use of TMd wood particles in composite holds promise for environmentally friendly 3D printing materials with favourable thermal and mechanical properties, impacting the expanding market for sustainable solutions in 3D printing.

• 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
• Year: 2024
• Number of pages: Str. 1251–1265
• Numbering: Vol. 19, no. 6
• 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-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

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

Projects

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

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