| Autor: |
Rossi SS; Embraer, Rodovia Presidente Dutra, s/n, Km 134, 12247-004 São José dos Campos, SP, Brazil., Carrara AE; Instituto Tecnológico de Aeronáutica (ITA), Departamento de Ciência e Tecnologia Aeroespacial, Praça Marechal Eduardo Gomes, 50, Vila das Acácias, 12228-900 São José dos Campos, SP, Brazil., Costa MCB; Universidade Federal do Rio Grande do Norte, Departamento de Engenharia de Materiais, Campus Universitário Lagoa Nova, Caixa Postal 1524, 59078-970 Natal, RN, Brazil., Martins CLGP; Universidade Federal de São Carlos, Departamento de Engenharia de Materiais, Rodovia Washington Luiz, s/n, 13565-905 São Carlos, SP, Brazil., Dutra RCL; Instituto Tecnológico de Aeronáutica (ITA), Departamento de Ciência e Tecnologia Aeroespacial, Praça Marechal Eduardo Gomes, 50, Vila das Acácias, 12228-900 São José dos Campos, SP, Brazil., Dutra JCN; Instituto Tecnológico de Aeronáutica (ITA), Departamento de Ciência e Tecnologia Aeroespacial, Praça Marechal Eduardo Gomes, 50, Vila das Acácias, 12228-900 São José dos Campos, SP, Brazil. |
| Abstrakt: |
This study describes a methodology to prepare and characterize PUF [poly(urea formaldehyde)] microcapsules containing 5-ethylidene-2-norbornene (ENB) as self-healing agent, as well as the compatibility evaluation of ENB in the presence of Grubb's catalyst with an epoxy matrix. First, the results of an adhesion assay by lap shear proved chemical compatibility between the epoxy matrix and self-healing agent in the presence of Grubb's catalyst. After evaluating the chemical compatibility, microcapsules with ENB were synthesized in an oil-in-water emulsion system. Thereafter, the microcapsules were morphologically, chemically and thermally characterized in which a granulometric dispersion between 30-140 μm and an average size of 69.8 ± 4.9 μm were observed. The SEM (scanning electron microscope) results showed that the average thickness of microcapsules shell was 3.6 ± 0.4 μm. The thermogravimetric analysis (TGA) showed that microcapsules are susceptible to rupture and consequent ENB release in temperatures greater than 230 °C, demonstrating that microcapsules are suitable for applications in materials with self-healing capacity. |
