FTIR EVOLVED GAS-ANALYSIS OF THE DECOMPOSITION PRODUCTS OF CELLULOSE DIACETATE

Evolved gas analysis of unplasticised cellulose diacetate flake and pl asticised cellulose diacetate him (Clarifoil) was carried out as part of an assessment of the potential hazard that could occur as a result of overheating these materials during processing. In order to perform this work, a simple apparatus for heating a sample and introducing the evolved gases into an FTIR gas flow cell was constructed. These measu rements were supplemented by thermogravimetry as part of another exper iment. Studies of the infrared spectra and thermogravimetric data show ed that both materials degrade above 250 degrees C, generating CO, CO2 and acetic acid. In addition, Clarifoil releases plasticiser (diethyl phthalate) between 100 degrees and 250 degrees C. Since its flash poi nt is 160 degrees C, the potential fire hazard of this material needs to be taken into account during any processing operation which could r each this temperature. (C) 1997 Elsevier Science B.V.