Banca de QUALIFICAÇÃO: ISABELLA DONADELLO DUARTE

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ISABELLA DONADELLO DUARTE
DATE: 12/07/2022
TIME: 16:00
LOCAL: https://meet.google.com/prz-mown-dyn
TITLE:

Addition of poly(ethylene co-acrylic acid) in carbon-epoxy composites: an investigation as a self-healing agent under mechanical damage and hygrothermal aging

KEY WORDS:

composites; carbon-epoxy; self-healing; prepreg; aging; poly (ethylene-co-acrylic acid).

PAGES: 54
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUMMARY:

Polymer matrix composites (PMCs) represent an exponential growth in structural applications due to its distinct advantages such as high stiffness, strength and lower weight. Still, PMCs are susceptible to damage and degradation during service and environmental exposure. Repairing these structures may be costly and time-consuming, for this reason alternative and promising approaches like adding thermoplastic agents to thermoset matrixes emerged to improve PMCs service life. The aim of this study is to investigate poly (ethylene-co-acrylic acid) (EAA) as a self-healing agent on carbon/epoxy composites, where damage is introduced in the material by interlaminar shear strength (ILSS) tests and hygrothermal aging. Thermoplastic pellets were ground and spread in prepreg laminate partially cured resin. Pure composite plates and with 10wt % of EAA powder were investigated. Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) were employed to evaluate thermoplastic thermal properties. Interlaminar shear strength (ILSS), Dynamic mechanical analysis (DMA), Fourier-transform infrared (FTIR) spectroscopy, and Scanning electron microscopy (SEM) were employed to investigate self-healing ability before and after healing cycle. The mentioned techniques and mass variation were also employed to evaluate composites under hygrothermal aging for 45 days. Chemical bounds between EAA and complete recovery of mechanical properties after healing are expected. It is also expected to understand how thermoplastic can impact composite material properties in the long term.

COMMITTEE MEMBERS:
Presidente - 2042234 - ANA PAULA CYSNE BARBOSA
Interno - 1202134 - JOSE DANIEL DINIZ MELO
Externa à Instituição - BRUNA LOUISE SILVA