Thermomechanical pulp fines as additives for 3D printing filaments
department or school: Forestry, Faculty of
data provider: DSpace
degree campus: UBCV
creator: Chen, Siwei
issued: 2024-04-29T20:26:51Z
issued: 2024
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: To enhance the sustainability of fused deposition modeling (FDM) 3D printing filaments, wood materials are emerging as eco-friendly fillers in thermoplastics. This study introduced thermomechanical pulp (TMP) fines, a by-product from industrial pulping process, as fillers in polylactic acid (PLA) for 3D printing filaments. To address the limited compatibility between hydrophilic fines and hydrophobic PLA matrices, three strategies were adapted to prevent fine agglomeration and enhance filler-matrix adhesion. Mechanical treatment using ball milling, chemical modification by (2-Dodecen-1-yl)succinic anhydride (DDSA) esterification, and additives of coupling agents (maleic-anhydride grafted polypropylene [MAPP] and maleic-anhydride grafted PLA [MAPLA]) were employed and systematically studied. Tensile, rheology, thermal analysis and printability tests were conducted to evaluate the effect of incorporating fines and the efficacy of above three methods. Further characterization by scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM) were used to analyze fracture surfaces and understand fine distribution. The PLA/TMP fines composites exhibited higher tensile modulus compared to pure PLA (increased from 792 MPa to 1084 MPa with a 20% w/w loading content), while it lowered the tensile strength, elongation at break and toughness. Compared to untreated TMP fines at the same loading level (20% w/w), the composites with ball-milled (Bm) fines presented a 33% increase in tensile strength, a 115% increase in elongation at break, and a 192% increase in toughness due to smaller fine particles and improved dispersion. DDSA-treated fines showed increased hydrophobicity but limited mechanical improvement. By adding MAPP or MAPLA into the PLA/TMP fines composites, both groups exhibited toughening effects, especially with MAPP. Combining MAPP with ball milling further enhanced the composites (10 % w/w untreated TMP fines in PLA) with an increase of elongation…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/88095
note: THERMOMECHANICAL PULP FINES AS ADDITIVES FOR 3D PRINTING FILAMENTS by Siwei Chen B.Sc., The University of British Columbia, 2021 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Forestry) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) April 2024 © Siwei Chen, 2024 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the thesis entitled: Thermomechanical Pulp Fines as Additives for 3D Printing Filaments submitted by Siwei Chen in partial fulfilment of the requirements for the degree of Master of Applied Science in Forestry Examining Committee: Scott Renneckar, Professor, Forestry, UBC Supervisor Heather Trajano, Associate Professor, Chemical and Biological Engineering, UBC Supervisory Committee Member Feng Jiang, Associate Professor, Forestry, UBC Supervisory Committee Member Yasmine Abdin, Assistant Professor, Materials Engineering, UBC Additional Examiner iii Abstract To enhance the sustainability of fused deposition modeling (FDM) 3D printing filaments, wood materials are emerging as eco-friendly fillers in thermoplastics. This study introduced thermomechanical pulp (TMP) fines, a by-product from industrial pulping process, as fillers in polylactic acid (PLA) for 3D printing filaments. To address the limited compatibility between hydrophilic fines and hydrophobic PLA matrices, three strategies were adapted to prevent fine agglomeration and enhance filler-matrix adhesion. Mechanical treatment using ball milling, chemical modification by (2-Dodecen-1-yl)succinic anhydride (DDSA) esterification, and additives of coupling agents (maleic-anhydride grafted polypropylene [MAPP] and maleic-anhydride grafted PLA [MAPLA]) were employed and systematically studied. Tensile, rheology, thermal analysis and printability tests were conducted to evaluate the effect of incorporating fines…
has type: Thesis/Dissertation
date issued: 2024-11
is shown at: 10.14288/1.0442042
language: eng
degree discipline: Forestry
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Renneckar, Scott
type: Text
identifier URI: http://hdl.handle.net/2429/88095