| Texto completo | |
| Autor(es): |
da Silva, Mauro Sergio
;
de Souza, Alana Gabrieli
;
Rosa, Derval dos Santos
;
Valera, Ticiane Sanches
;
Wiebeck, Helio
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | POLIMEROS-CIENCIA E TECNOLOGIA; v. 34, n. 3, p. 11-pg., 2024-01-01. |
| Resumo | |
The UV-resistance performance of waterborne epoxy coatings with different aminic-curable substances was evaluated to solve the widely known problem of poor weathering resistance of coatings. Samples were evaluated by color and gloss changes, FTIR, thermal properties, and macroscopic morphology. Results indicated that higher aminic values in curing agents degraded faster than lower aminic values (increases of similar to 3% in delta b and delta E between 5 and 20%). All samples showed a gloss variation varying between 40 and 70 G.U. FTIR and Tg indicated the resin degradation when using curing agents of unmodified aliphatic amine because of its rapid chemical degradation under a UV environment, as confirmed by microscopy images. The curing agents with aminic values between 200 and 300 KOH/g and the equivalent weight of amine hydrogen higher than 120 g/eq showed the best performance in epoxy coatings and good stability against accelerated aging, being promising options for future applications. (AU) | |
| Processo FAPESP: | 21/14714-1 - EMU concedido no processo 2020/13703-3 (projeto temático): Cromatógrafo de Íons Modular 940 Professional IC Vario |
| Beneficiário: | Derval dos Santos Rosa |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Equipamentos Multiusuários |
| Processo FAPESP: | 20/13703-3 - Materiais porosos ecológicos para a recuperação e reavaliação de metais recuperados de água contaminada |
| Beneficiário: | Derval dos Santos Rosa |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 22/01382-3 - Hidrogéis de celulose contendo argilas modificadas para remoção e recuperação de íons metálicos presentes em águas contaminadas |
| Beneficiário: | Rafaela Reis Ferreira |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |