Functional polysiloxanes. 6 - Synthesis of aziridine-terminated polydimethylsiloxanes

The synthesis of new telechelic polydimethylsiloxanes containing aziridine end groups by 1,3-dipolar addition of 4-methoxyphenylazide to vinyl-termina ted siloxane was investigated. The peculiarity of this system, as proved on the low molecular weight model compound based on 1,3-divinyl-1,1,3,3-tetra methyldisiloxane, consists in the formation of a single addition functional ity of aziridine type. The structure of the final and intermediate products was established by IR, NMR and elemental analysis. The aziridine units lin ked to the siloxane chains were proved to undergo further cationic polymeri zation and to yield crosslinked siloxane based structures.