Adição de poli (etileno-co-ácido-metacrílico) (EMAA) como agente de reparo em compósitos fibra de vidro-epóxi
Materials with self-healing mechanism offer great potential for new scientific and technological developments. This is a research area with great possibilities for advances in the field of materials science and engineering. In this sense, the present work aims at the manufacture and characterizat...
Sábháilte in:
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| Rannpháirtithe: | |
| Formáid: | Dissertação |
| Teanga: | pt_BR |
| Foilsithe / Cruthaithe: |
Universidade Federal do Rio Grande do Norte
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| Ábhair: | |
| Rochtain ar líne: | https://repositorio.ufrn.br/handle/123456789/48339 |
| Clibeanna: |
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| Achoimre: | Materials with self-healing mechanism offer great potential for new scientific and
technological developments. This is a research area with great possibilities for advances in the
field of materials science and engineering. In this sense, the present work aims at the
manufacture and characterization of a composite material, additivated with a thermoplastic
healing agent, where the ability to heal localized damage and delamination was evaluated. This
healing is activated via heat supply, through an external source, and promotes increased
mobility of the thermoplastic agent, poly (ethylene-co-acid-methacrylic) (EMAA). The
specimens were divided into 4 study groups, thus, the total of 20 specimens, meeting the
following conditions: 0% EMAA without damage (reference material), 0% EMAA with
damage, 10% EMAA with damage, 10% EMAA with damage and healed. The damage was performed on the specimens in a controlled manner, via impact
machine by free fall, thus being characterized as low speed impact. Fourier Transform Infrared
Spectroscopy (FTIR) allowed evaluation of chemical interactions between the epoxy matrix
and the repair agent, post fabrication and post-healing cycle. Visual inspection was employed
to evaluate affected areas, to compare the behavior of specimens under the influence of impact
energy and EMAA effect, in relation to the filling of cracks and energy absorption. Finally, the
mechanical post-impact compression test (CAI) was performed to evaluate whether there was
alteration of properties of the composite material modified with addition of the healing agent
as compared to the unmodified material. |
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