Organoborazines. III. Homo‐ and copolymerization of p‐vinylphenylcyclotriborazines

The polymerization and copolymerization with styrene of a series of unsymmetrically B‐ p ‐vinylphenyl‐ N ‐methyl and N ‐phenyl borazines [R 3 (R 2 ) 2 B 3 N 3 (R 1 ) 3 ; R 1 = methyl, phenyl, R 2 = methyl phenyl, R 3 = p ‐vinylphenyl] has been studied. The polymerization of these monomers yielded both tractable and crosslinked materials. The polymers obtained were characterized by 1 H‐ and 13 C‐NMR spectroscopy, elemental analysis, gel permeation chromatography, and thermogravimeteric analysis. The reactivity ratios for the copolymerization reaction were calculated by the Mortimer‐Tidwell method.