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

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.

Keywords

Cork Thermal decomposition of cork 13C Solid-state nuclear magnetic resonance Fourier transform infrared studies . Faculdade de Ciências Exatas e da Engenharia

URI

http://hdl.handle.net/10400.13/3375

Citation

Neto, C. P., Rocha, J., Gil, A., Cordeiro, N., Esculcas, A. P., Rocha, S., ... & Correia, A. F. (1995). 13C solid-state nuclear magnetic resonance and Fourier transform infrared studies of the thermal decomposition of cork. Solid state nuclear magnetic resonance, 4(3), 143-151.