Functionalization of phosphazenes. 1. Synthesis of phosphazene materials containing hydroxyl groups

A flame-retardant phosphate and cyclotriphosphazene-containing epoxy resin: Synthesis and properties

“…These peaks disappeared from the spectrum of 2, supporting the structure. The results are similar to those reported by Medici et al 29 The functionalized cyclotriphosphazenes 3 and 4 were also characterized by FTIR and 1 H and 31 P NMR spectra. The corresponding data are listed in Table III.…”

“…Therefore, as depicted in Scheme 1, the hydroxy-function-containing cyclotriphosphazene 2 was prepared first by the reaction of N 3 P 3 Cl 6 with 4-methoxyphenol to obtain 1 and then by reduction with an excess of BBr 3 . 29 Through a partial phosphorylation, 2 was reacted with diethylchlorophosphate to give 3. Finally, PPCTP was obtained by the reaction of 3 with epichlorohydrin.…”

Poly(organophosphazene)s and the sol-gel technique

“…First synthesized in our group 67 starting from poly[bis(4-methoxyphenoxy)phosphazene] by reaction with boron tribromide, 66 this polymer was then used for a number of functionalization reactions made possible by the high reactivity of the free hydroxylic groups present in the para position of the side-chain phenoxy substituents.…”

“…Thus the reaction of POPOH with acetic anhydride 67 led to the synthesis of poly[bis(4-acetyloxy-phenoxy)phosphazene], a polymer potentially useful in photoresist technology; 68 POPOH, moreover, was reacted with carboxylic acids, acyl chlorides and a-bromomethylene derivatives containing carbon-carbon double bonds to introduce chemical unsaturations into the phosphazene substrates. 69 The phosphazene macromolecules containing ethylene groups that were obtained were successively peroxidized by the action of m-chloroperbenzoic acid to form new polyphosphazenes functionalized with a controlled number of epoxy units.…”

Phosphazene cyclomatrix network polymers: Some aspects of the synthesis, characterization, and flame‐retardant mechanisms of polymer

“…Therefore, one active group of the bifunctional component must be protected first and then deprotected to form a distinct cyclic trimer, which complicates the reaction procedure and limits its applications. 14,15 Recently, a particularly interesting cyclomatrix system aimed at flame-retardant application was derived from reactions of phosphazene-ringcontaining maleamic acids, which resulted in highly crosslinked resins on heating and further thermal curing. The polymerization of the tris-p-aminophenoxytris-p-phenyl maleimide species gave a resin with 82% char at 800°C.…”