Thermal decomposition of cyanate ester resins
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2001-09-01
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Edition:Final report
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Abstract:Polycyanurate networks were prepared by thermal polymerization of cyanate ester monomers containing two or more cyanate ester
(–O-C≡N) functional groups. The thermal decomposition chemistry of nine different polycyanurates was studied by
thermogravimetry and infrared analysis of solid films and analysis of the gases evolved during pyrolysis using infrared spectroscopy
and gas chromatography-mass spectrometry. It was found that the thermal stability of the polycyanurates was essentially
independent of monomer chemical structure with the major mass loss occurring at about 450°C for all materials. Analysis of the
solid-state and gas phase thermal degradation chemistry indicates a thermal decomposition mechanism for polycyanurates which
begins with hydrocarbon chain scission and cross-linking at temperatures between 400°-450°C with negligible mass loss, followed
by decyclization of the triazine ring at 450°C that liberates volatile cyanate-ester decomposition products. The solid residue after
pyrolysis increases with the aromatic content of the polymer and incorporates about two thirds of the nitrogen and oxygen present
in the original material.
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