Abstract
A synthesis of organosilicon 1,3-benzoxazines (BZ-Si) was accomplished by the reaction of organic phenols, paraformaldehyde and 3-aminopropyl(trialkoxy)silanes, as well as organosilicon phenols of the general formula R´[SiMe2O]n[SiMeRO]mSiMe2R´ (R´ is 4-hydroxy-3methoxyphenylpropyl-, R is methylor 4-hydroxy-3-methoxyphenylpropyl), paraformaldehyde, and aniline (or monoethanolamine). The structure of BZ-Si was confirmed by NMR and IR spectroscopy. The studies of BZ-Si by DSC showed that the benzoxazine ring opening takes place in the temperature range 130—265 °C. The temperature of 5% mass loss of BZ-Si in air is within 220—270 °C (TGA).
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