| Journal: | Maderas : ciencia y tecnología |
| Database: | |
| System number: | 000534613 |
| ISSN: | 0718-221X |
| Authors: | Lopes, Juliana de Oliveira1 Garcia, Rosilei Aparecida2 Souza, Natália Dias de2 |
| Institutions: | 1Universidade Federal Rural do Rio de Janeiro Instituto de Florestas Departamento de Produtos Florestais, Seropédica Rio de Janeiro. Brasil 2Universidade Federal Rural do Rio de Janeiro Instituto de Florestas Departamento de Produtos Florestais, Seropédica Rio de Janeiro. Brasil |
| Year: | 2018 |
| Volumen: | 20 |
| Number: | 4 |
| Pages: | 737-746 |
| Country: | Chile |
| Language: | Inglés |
| English abstract | During the thermal modification of the wood there is a decreasing gradient of temperature from the surface to its interior, therefore, the most severe chemical modifications occur on the surface. These chemical modifications directly affect the quality and durability of adhesives and coating. Therefore, this study investigated the chemical modification of the surface of thermally-modified teak juvenile wood. Heartwood and sapwood samples were treated at 180 and 200ºC. Chemical analyses were performed by Fourier transform infrared spectroscopy (FTIR) in reflectance mode with a microscope. Spectra showed an increase in cellulose crystallinity and a decrease in relative contents of hydroxyl groups, lignin and extractives - especially quinones, waxes and oils - following thermal modification. Extractive content of the heartwood was relatively higher than that of sapwood. Heartwood was more susceptible to thermal degradation than sapwood. |
| Keyword: | Cellulose crystallinity, Chemical modification, Heat treatment, Quinone derivatives, Tectona grandis. |
| Full text: | Texto completo (Ver HTML) Texto completo (Ver PDF) |
