Abstract
The effects of phenol resin and fire retardants (NH4Br and (NH4)2-HPO4) on the smoldering combustion of wood have been investigated by the measurements of TGA, the dynamic viscoelasticity (E' and E") and the oxygen consumption.
The addition of fire retardants to wood accelerates the oxygen consumption of wood from 180°C corresponding to the weight loss and the decrease of E' and E". The solid residue of fire retardants-wood was remained more than that of wood at around 260°C. These results indicate that fire retardants increase the oxygen absorbable sites of wood which promote the evolution of gaseous components during thermal oxidation and result in the carbonization of wood.
Phenol-WPC system showed a long induction period of oxygen consumption at 200°C, irrespective of larger amount of oxygen consumption than that of wood. After 8hr-exposure to oxygen atmosphere, the weight of phenol-WPC decreases to the half value of the initial weight up to 200°C, however, the residual weight didn't change so much above 200°C. It is mentioned that the formation of cross-linking networks of phenol resin in the surface of the cell wall prevents the adsorption of oxygen into wood, and promotes the carbonization of wood at the temperature range above 200°C.
© 1983 Center for Fire Science and Technology, Research Institute for Science and Technology, Tokyo University of Science
