Abstract
Polyurethanes prepared by reaction of methylene bis(4-phenylisocyanate) with diethylene glycol and with poly(ethylene glycol) with a moelcular weight of approximately 200 have been thermally degraded in the presence of ammonium polyphosphate (APP). Degradation has been carried out at temperatures up to 500°C and the volatile products and structural changes in the residue have been analysed in detail. In addition to the reactions which occur in the pure polymer, the presence of APP induces additional acid catalysed processes which make the overall reaction very much more complicated. From the experimental data, a comprehensive mechanism for the overall process has been deduced and discussed.
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