3D-Printed Thermoset Biocomposites Based on Forest Residues by Delayed Extrusion of Cold Masterbatch (DECMA)
| Autor: | Siddharth Jayaprakash, Niklas Kretzschmar, Hossein Baniasadi, Jukka Seppälä, Rubina Ajdary, Jon Trifol, Jouni Partanen, Orlando J. Rojas |
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| Přispěvatelé: | Department of Chemical and Metallurgical Engineering, Department of Mechanical Engineering, Department of Bioproducts and Biosystems, Aalto-yliopisto, Aalto University |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Engineering
3d printed DECMA General Chemical Engineering 3D printing 02 engineering and technology 010402 general chemistry 01 natural sciences Chemical society chemistry.chemical_compound thermoset forest residues Environmental Chemistry Competence (human resources) biocomposites Renewable Energy Sustainability and the Environment business.industry paste extrusion General Chemistry 021001 nanoscience & nanotechnology Manufacturing engineering 0104 chemical sciences Honeycomb structure chemistry Masterbatch 0210 nano-technology business |
| Popis: | Funding Information: Dr. J.T. is grateful for the support of the Academy of Finland’s Flagship Programme under Projects Nos. 318890 and 318891 (Competence Center for Materials Bioeconomy, FinnCERES). The authors acknowledge the funding support by the Academy of Finland’s BioFuture2025 program under project 2228357-4 (3D Manufacturing of Novel Biomaterials) and the provision of facilities by Aalto University at OtaNano Nanomicroscopy Center (Aalto-NMC). The authors also acknowledge Ashish Mohite for the elaboration of the G-code for the honeycomb structure and Kari Kääriäinen for the post-processing of 3D-printed parts with a CNC machine. Publisher Copyright: © 2021 The Authors. Published by American Chemical Society. We developed a 3D-printing process based on thermoset biocomposites termed Delayed Extrusion of Cold Masterbatch (DECMA). DECMA is a processing method, based on controlling the degree of curing, that takes some responsibility of the 3D printing from materials and as such can be used to 3D print otherwise unprintable materials. First, a masterbatch was produced by mixing a bio-based resin (bioepoxy) and sawdust and lignin. This paste was partially cured at room temperature until reaching an apparent viscosity suitable for extrusion (≈105 mPa·s at 1 s-1). The system was next cooled (5-10 °C) to delay subsequent hardening prior to 3D printing. The printability of the biocomposite paste was systematically investigated and the merits of the delayed extrusion, via DECMA, were assessed. It was found that DECMA allowed the revalorization of sawdust and lignin via 3D printing, as direct printing led to failed prints. Our approach afforded cost-effective, shear-thinning dopes with a high bio-based content (58-71%). Thebio-based 3D-printed materials demonstrated good machinability by computer numerical control (CNC). Overall, the benefits of the introduced DECMA method are shown for processing bio-based materials and for on-demand solidification during additive manufacturing. |
| Databáze: | OpenAIRE |
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