INVESTIGADORES
MANFREDI liliana Beatriz
artículos
Título:
nfluence of the Chemical Composition on the Thermal Degradation and Fire Resistance of Resol Type Phenolic Resins
Autor/es:
D.PUGLIA; J.M.KENNY; L. B. MANFREDI; A. VÁZQUEZ
Revista:
MATERIALS ENGINEERING (MODENA)
Editorial:
Mucchi
Referencias:
Lugar: Modena; Año: 2001 vol. 12 p. 55 - 72
ISSN:
1120-7302
Resumen:
A study of the thermal degradation of resol type phenolic resins with different formaldehyde/phenol molar ratio (F/Ph), performed mainly by thermogravimetric analysis, is reported in this work. Flynn-Wall and Kissinger methods were applied to experimental data obtained in dynamic mode in order to obtain a kinetic model of the degradation process and its parameters.  A variable apparent activation energy that changes with the degree of reaction characterizes the degradation process.  Three main peaks are observed in the thermograms obtained; the first peak is associated with the lost of free phenol, formaldehyde and oligomers and the second and third peaks are associated with degradation and crosslinking reactions. The higher residual mass was obtained for the resol with molar ratio of 1.4, accordingly with the highest methylene bridge content.  The residual mass was characterized using FTIR. A significant residual concentration of aliphatic, aromatic and diphenyl ether structures in the char were observed while it was not possible to produce a quantitative description of the degradation reactions and of their products. The fire resistance of the studied resols was analyzed using a Cone Calorimeter.  The higher ignition time was obtained for the resol with 1.3 molar ratio formaldehyde/phenol.