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MCA_ thermal decomposition product (3)
Two kinds of granular and acicular crystals were found in the decomposition of melamine cyanurate at 420 °C in an electric furnace. The IR Spectra of the granular and acicular crystals are shown in figures 4-12 and 4-13, and the x-ray diffraction spectra of the granular crystals are shown in figures 4-14. Compared with Melamine, cyanuric acid and MCA and their mixtures, the granular crystals were found to be consistent with the IR and X-ray diffraction patterns of the Mixture of Melamine and MCA, indicating that part of the MCA had decomposed at 420 °C, however, the MCA did not decompose to form melamine and cyanuric acid, because it was identified as ammonium cyanate by analysis of another needle-like crystal, indicating that the Chemical Bond in the MCA ring broke first on one side of the melamine cyanurate ring at 420 °C, rather than the separation of the cyanuric acid molecule as a whole.
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