Banca de QUALIFICAÇÃO: SAMUEL NOGUEIRA FIGUEIREDO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE: SAMUEL NOGUEIRA FIGUEIREDO
DATA: 04/12/2024
HORA: 08:30
LOCAL: Banca Remota
TÍTULO: Desenvolvimento de Filamentos Compósitos PLA/PBAT Reforçados com Grafite
PALAVRAS-CHAVES: composite filaments; 3D printing; graphite
PÁGINAS: 35
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Materiais Conjugados Não-Metálicos
RESUMO:

Additive manufacturing, especially 3D printing via Fused Deposition Modeling (FDM), has been increasingly used due to its ability to create complex and personalized products. Besides, this processing technique can be performed with biodegradable polymers such as polylactic acid (PLA), a pioneer polymer in additive manufacturing profiles. Despite having a good set of desirable properties, the low impact strength and heat resistance of PLA limit its applications, which leads to studies on the use of different biodegradable polymers and additives. In this work, PLA/PBAT composite filaments having different amounts of graphite as the filler were developed for application in FDM additive manufacturing. The systems were evaluated for their printability, microstructure, thermal and mechanical properties. Morphological evaluation showed graphite to be homogeneously dispersed and distributed within the composites and voids were present in some of the systems. FTIR analysis confirmed the presence of characteristic functional groups, while TGA indicated an improvement in thermal stability of the composites. Tensile tests indicated graphite addition lead to a slight reduction in elastic modulus and elongation at break, while dynamic-mechanical analysis (DMA) indicated viscoelastic characteristics of the filaments. As for printability, adhesion was observed between the fused layers, resulting in parts with high dimensional regularity and good surface finish. The data obtained shows that the compositions developed here can be used as composite filaments for 3D printing applications, offering more sustainable and functional alternatives compared to traditional filaments.

MEMBROS DA BANCA:
Presidente - 1331130 - TATIANNY SOARES ALVES
Interno - 1720808 - RENATA BARBOSA
Externo à Instituição - 011.178.424-79 - JOYCE BATISTA AZEVEDO - UFBA