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A. Kościelecka


Thermal degradation of polyurethanes.

Part V. An influence of molar ratio of poly(ethylene terephthalate) on the thermostability of polyesterurethanes


Polimery 1981, No 9, 349



DOI: dx.doi.org/10.14314/polimery.1981.349

Summary

The kinetics of thermal degradation of urethane block copolymers obtained from 4,4'-diphenylmethane diisocyanate and a mixture of poly(ethylene adipate) and poly(ethylene therephthalate) of different molar ratio were studied. It has been found that two stages of degradation are observed during the isothermal heating of polyurethanes at 260—310°C. Rate constants of weight loss in the first stage depend on molar ratio of PET and determine the overall degradation process. A copolymer containing 36 molar % PET exhibits crystalline and flexible properties and the best thermal resistance. The activation energy of weight loss of all polyurethane samples is similar which suggests a similar decomposition mechanism


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