Banca de DEFESA: LILIAN MAIARA MORAIS E SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : LILIAN MAIARA MORAIS E SILVA
DATA : 25/10/2018
HORA: 10:00
LOCAL: A definir
TÍTULO:

Study of the addition of the thermoplastic poly(ethylene-co-methyl acrylate-co-glycidil methacrylate) (E-MA-GMA) as healing agent in glass fiber – epoxy composites

PALAVRAS-CHAVES:

glass fiber-epoxy, self-healing, E-MA-GMA, prepreg.

PÁGINAS: 68
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Materiais Conjugados Não-Metálicos
RESUMO:

A critical problem of epoxy matrix composites is their susceptibility to nucleate microcracks during service, which can cause catastrophic failure or shortening the service lifetime of the components. An alternative to overcome this problem is the use of self-healing materials, where the formed microcracks are repaired, preventing catastrophic failure propagation and reducing maintenance costs. One of the mechanisms suggested in the literature for self-healing of microcracks is the application of thermoplastic particles. The aim of this work is to analyze the effect of the addition of poly (E-MA-GMA) thermoplastic as a healing agent in a fiberglass-epoxy composite. The materials studied were characterized by interlaminar shear strength (ILSS), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and dynamic mechanical analysis (DMA). The addition of thermoplastic did not cause significant reduction in the Tg of the composite. ILSS results after healing showed that the stiffness and strength of the samples were reduced, as compared to values before the healing cycle. Nevertheless, strength reduction was lower when the thermoplastic was inserted in between all prepreg plies. MEV images showed that E-MA-GMA functioned as an adhesive agent, preventing delamination in the mid-plane of the laminate.

MEMBROS DA BANCA:
Presidente - 2042234 - ANA PAULA CYSNE BARBOSA
Interno - 1202134 - JOSE DANIEL DINIZ MELO
Externo ao Programa - 1064594 - EVANS PAIVA DA COSTA FERREIRA
Externo à Instituição - MARIA ODILA HILÁRIO CIOFFI - UNESP