13C solid-state nuclear magnetic resonance and Fourier transform infrared studies of the thermal decomposition of cork

• Autor(a) principal: Neto, C.Pascoal
• Data de Publicação: 1995
• Outros Autores: Rocha, J., Gil, A., Cordeiro, N., Esculcas, A.P., Rocha, S., Delgadillo, I., De Jesus, J.D.Pedrosa, Correia, A.J.Ferrer
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.13/3375
• topic: Cork; Thermal decomposition of cork; 13C Solid-state nuclear magnetic resonance; Fourier transform infrared studies; .; Faculdade de Ciências Exatas e da Engenharia

The thermal decomposition of cork has been studied by Fourier transform infrared (FTIR) spectroscopy and 13C solid-state nuclear magnetic resonance (NMR) spectroscopy with cross-polarization and magic-angle spinning (CP-MAS), high-power ‘H decoupling (HPDEC) and cross-polarization depolarization-polarization (CPDP). Waxes and other soluble components of cork begin to decompose at ca. 150°C. This is accompanied by partial decomposi tion of suberin, probably initiated at the points of attachment to the cell wall. The carbohydrates begin to decompose at ca. 200°C. The decomposition of lignin begins at 250-3OO”C, while suberin undergoes further degradation. Significant amounts of coke are formed in the process. At 400°C cork has been transformed into coke with traces of partially decomposed suberin. The thermal decomposition of cork is dependent on the calcination time, particularly in the 200-350°C range.