| Revista: | Polimeros (Sao Carlos) |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000314267 |
| ISSN: | 1678-5169 |
| Autores: | Monteavaro, Luciane L1 Riegel, Izabel C2 Petzhold, Cesar L3 Samios, Dimitrios |
| Instituciones: | 1Universidade Federal do Rio Grande do Sul, Rio Grande, Rio Grande do Sul. Brasil 2Centro Universitario Feevale, Instituto de Ciencias Exatas e Tecnologicas, Novo Hamburgo, Rio Grande do Sul. Brasil 3Universidade Federal do Rio Grande do Sul, Instituto de Quimica, Rio Grande, Rio Grande do Sul. Brasil |
| Año: | 2005 |
| Periodo: | Abr-Jun |
| Volumen: | 15 |
| Número: | 2 |
| Paginación: | 151-155 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | New types of polyurethanes were prepared by reacting diisocyanates and formiated soy polyols with different OH functionalities. Thermal properties and degradation kinetics were investigated by TGA. All prepared PU's showed at least two-weight loss steps, the first one, around 210 °C. Thermal stability of these PUs depends strongly on urethane groups per unit volume and an increase in the weight loss was observed as a result of the increased amount of urethane groups. Degradation kinetics behavior of the soy-based polyurethanes was investigated according to the Flynn method. Different average activation energy values were obtained from isothermal and isoconversional curves, 140.6 KJ/mol and 62.8 KJ/mol, respectively, indicating the complexity of the PUs degradation process |
| Disciplinas: | Química |
| Palabras clave: | Química de polímeros, Poliuretano, Soya, Estabilidad térmica, Cinética de degradación |
| Keyword: | Chemistry, Polymer chemistry, Polyurethane, Soybean, Thermal stability, Degradation kinetics |
| Texto completo: | Texto completo (Ver HTML) |
