Syntheses of Phosphatriazines for Potential High Temperature Fluids and Elastomers Applications.

摘要

The symmetrical and unsymmetrical tetraazacyclooctooctatetraenes were found to be thermally less stable than the analogously substituted six-membered phospha-s-triazines. Both materials at 316 degrees C underwent transformation to phospha-s-triazines; the symmetrical arrangement giving diphospha-s-triazine and the corresponding nitrile; the unsymmetrical isomer forming monophospha-s-triazine and diphenylphosphazene trimer. No polymeric compounds could be synthesized having the symmetrical octatetraene ring arrangement as a chain component; only bicyclics were formed. Unsymmetrical polydiphosphatetraaza-cyclooctatetraenes having thermal and thermal oxidative stabilities directly comparable to those of their monomeric analogues were successfully prepared.