| Abstract: | The reactions of various B-dichloro-N-triarylborazines with boiling N,N-dimethylformamide (DMF), and DMF in the presence of dimethylamine have been shown to give condensation polymers of the polyborazylene oxide type. The degrees of polymerisation range in individual cases from about 2–25. The presence of one ortho substituent in the N-aryl group causes the molecular weight to fall sharply, and polymerisation is completely inhibited in the presence of two ortho substituents. Reactions of several N-triarylborazines with boiling DMF also gave polyborazylene oxide-type polymers together with trimethylamine. The infra-red spectra, and thermal and hydrolytic stability of the polymers have been investigated. |
