Thermal Degradation of Model Fire-Retarded Urethane Foams: An Analytical Study--2

摘要

The products of degradation of both fire-retardant and nonfire-retardant model rigid-urethane foams were studied. A series of model rigid-urethane foams was prepared and all samples were pyrolyzed at temperature of 500, 750, and 1000C. Gas chromatograph columns were used to separate the volatile products. It was found that as pyrolysis temperature increased, the mechanism of degradation of urethane foam remained unchanged. The breakage of urethane bond, releasing carbon dioxide, was the major reaction. With an increase in temperature, the polyol component degraded further to form light gases. With the addition of fire retardant, the nature of pyrolysis products was altered slightly. Although the basic degradation mechanism remained unchanged, the fire retardant catalyzed the reactions, leading to the formation of certain noxious and light gases.