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E. Kicko-Walczak

Studies on the mechanism of thermal decomposition of unsaturated polyester

resins with reduced flammability

Polimery 2003, No 5, 351


DOI: dx.doi.org/10.14314/polimery.2003.351


Summary

On the basis of experimental results the kinetic dependencies describing the process of thermal degradation of polyester compositions [modified with halogen free fire retardant (Sn/Zn system)] (Figs. 11-13) as well as the mechanism of the process have been characterized. Thermogravimetric methods (TG, Figs. 1-4 and 8-10) including TG coupled either with Fourier transformation infrared spectroscopy (TG-FT-IR, Figs. 6-7) or with mass spectrometry (TG-MS) have been used in the investigations. It has been found that modification of polyesters using Sn/Zn system causes significant limitation of CO2 evolution and moderation of the combustion process because of slowing down the flame propagation as a result of modifier action. It has been established that stabilizing effect of fire retardant is a result of surface spherical barrier formation, which blocks the heat flow from the decomposition zone to the inner layers of a substance. A mechanism of polyester resins thermal stabilization using Sn/Zn system has been proposed.


Keywords: unsaturated polyester resins, flammability retardation, flame retardant (Sn/Zn system), TG, TG-FT-IR and TG-MS methods, kinetics and mechanism of thermal decomposition


E. Kicko-Walczak

Studies on the mechanism of thermal decomposition of unsaturated polyester resins with reduced flammability