Poly(organophosphazenes) containing azo dyes

Abstract

In this paper we describe a method for the functionalization of catenapoly[bis(4-hydroxyphenoxy)-;1'-phosphazene] with diazonium salts to form new, deeply-coloured, phosphazene copolymers containing variable amounts of azo dyes attached to the polyphosphazene skeleton. The degree of functionalization in these substrates is regulated in order not to exceed 20% of the sites available in the pristine polyphosphazene and to maintain a high percentage of unreacted, free, hydroxy groups, in the final, coloured copolymers. These species are still very reactive and able to undergo further functionalization reactions.

Poly(organophosphazene)s and the sol-gel technique

“…31 These composites could be obtained by reacting freshly prepared poly[bis(4-hydroxyphenoxy)phosphazene] (vide infra) with diazotized aromatic amines, arbitrarily fixing the concentration of these species below the 20% of the free, phosphazenesupported, phenol groups.…”