resumo
Additive manufacturing enables the creation of lighter, stronger parts and systems. To improve the 3-dimensional (3D) printed quality of bio-based composites, in this study, bamboo fibers were chemically modified via a two-step reaction. In the first step, NCO groups (of a diisocyanate) were grafted onto the surface of fibers, which were subsequently reacted with a polyol. The chemical modification was confirmed by spectroscopic analysis; the hydrophobicity, density, and thermal degradation of the fibers were also evaluated. Afterward, 3D-printed objects were produced using these fibers. First, the printability of these composites was assessed by analyzing their melting flow index (MFI) and glass transition temperature (T-g) values. Next, the enhancement of the 3D printing quality was confirmed by analyzing the morphology of the 3D-printed specimens. The advantage of using treated fibers was reflected in the improved mechanical performance of the obtained 3D specimens.
palavras-chave
MECHANICAL-PROPERTIES; CELLULOSE FIBERS
categoria
Polymer Science
autores
Gama, N; Magina, S; Ferreira, A; Barros-Timmons, A
nossos autores
Ana Margarida Madeira Viegas de Barros Timmons
Professor associado
Artur Jorge Faria Ferreira
Professor Coordenador
Nuno Vasco da Costa Gama Batista de Melo
Investigador Júnior
Sandra Pereira Magina
Investigadoragradecimentos
This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 and UIDP/50011/2020, financed by national funds through the Portuguese Foundation for Science and Technology/MCTES. Sandra Magina acknowledges FCT for the PhD grant SFRH/BD/121275/2016. The authors acknowledge Martinho Oliveria for the MF measurements.