Abstract
The gaseous products produced by pyrolysing various samples of cotton and flame retarded cotton fabrics in air at different temperatures (300–1200 °C) were identified and quantified via FTIR. CO and CO 2 evolutions were investigated in detail. The flame retardant samples showed enhanced CO and CO 2 concentrations at lower pyrolysis temperatures (300–450 °C). These evolutions showed similar temperature dependence behaviour for all samples tested. At higher temperatures (450–800 °C), a second pyrolysis stage is identified where product evolution increased in concentration towards respective maximum values within this range. At higher temperatures still (800–1200 °C) pyrolysis product oxidation occurred which thus reduced the concentrations of all oxidisable products. The relative evolutions of both CO and CO 2 are commensurate with the known vapour phase and condensed phase activities of bromine- and phosphorus-nitrogen-containing flame retardants, respectively.
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