Polymerization of N -methyl B -methyl amino borazine
Résumé
A large quantity of high-quality poly[ N -methyl B -methyl amino borazine] was synthesized via a solventless method from the monomer 1,3,5-trimethyl-2,4,6-tri(methyl amino) borazine. The thermal polymerization profi le was investigated with differential scanning calorimetry (DSC), Fourier transform infrared (FTIR), size exclusion chromatography (SEC), gas chromatography, and mass spectrometry. A polymerization mechanism involving the condensation reaction of two - N(H) CH 3 groups releasing methylamine was proposed and compared with the literature. As a result of cross-linking via the aminomethyl moiety, the cured polymer exhibited a molecular weight Mn of 790 g mol -1 , glass transition temperature of 64 ° C, high cross-link density, and thermal stability with a decomposition temperature of 165 ° C. Functionalized poly[ N -methyl B -methyl amino borazine] with chemical stability was fully characterized by 1 H, 13 C, 11 B nuclear magnetic resonance, FTIR, DSC, and SEC analyses. Ultraviolet absorption spectra evidenced changes in the structure of the aforementioned oligomers.