Banca de DEFESA: CAMILA BEATRIZ SOUZA DE MEDEIROS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : CAMILA BEATRIZ SOUZA DE MEDEIROS
DATA : 30/10/2018
HORA: 13:00
LOCAL: Sala de aulas do PPGCEM
TÍTULO:

Evaluation of printed PLA parts for biomedical applications

PALAVRAS-CHAVES:

Biomaterials, PLA, 3D Printing, Biodegradation

PÁGINAS: 85
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Polímeros, Aplicações
RESUMO:

Poly (lactic acid) (PLA) has attractive properties for use in the biomedical area because of its biocompatibility, which can be defined as the ability of a material to interact with living tissues without toxicity. PLA is biodegradable, since it is capable of being disintegrated by biological agents, being also bioreabsorbable, since the product of its degradation participates in the metabolic process of the human organism. Among the manufacturing techniques of PLA parts for biomedical applications, 3D printing stands out as promising, mainly due to the possibility of production of customized and individualized pieces, as well as production by prototyping with high level of detail. However, more studies involving the alteration of the properties of the material when in contact with biological medium are still necessary to evaluate the application of parts in implantable devices. The objective of this work was to evaluate changes in the properties of PLA parts made by 3D printing when immersed in phosphate saline solution for periods of 7, 14 and 30 days. The samples were evaluated for mass change, chemical changes (Fourier transform infrared spectroscopy - FTIR), changes in glass transition and crystallization temperatures (differential scanning calorimetry - DSC), changes in dynamic-mechanical properties mechanical dynamics - DMA), mechanical tests in 3-point bending and fatigue. Results showed an increase in mass after immersion for 7 days and a decrease in mass for samples immersed for 14 and 30 days. Results suggest chemical alterations, changes in glass transition temperature, reduction in fatigue life of immersed samples as compared to the material which was not immersed in phosphate saline solution.

MEMBROS DA BANCA:
Presidente - 2042234 - ANA PAULA CYSNE BARBOSA
Externo ao Programa - 1989838 - CAROLINE DANTAS VILAR WANDERLEY
Interno - 1202134 - JOSE DANIEL DINIZ MELO
Externo à Instituição - LAURA HECKER DE CARVALHO - UFCG