FURFURALDEHYDE RESIN PYROLYSIS IN A CLOSED-SYSTEM

The pyrolysis of two insoluble resins obtained by acid catalysis from furfuraldehyde and furfuraldehyde-dimethylketone was carried out in a closed system at 400 degrees C. The products of the pyrolysis were ext racted under their vapor pressure. The compositions of the pyrolyzates were analyzed by mass spectrometry using a direct inlet probe techniq ue under an electron impact of 70 eV. Thus, the main structural sequen ces of both resins were determined. Trifurylic sequences are the main component for the furfuraldehyde resin but the furfuraldehyde-dimethyl ketone resin has two types of structural units: furfurylidene and fur ylmethylene. (C) 1998 Elsevier Science Limited. All rights reserved.