Hybrid materials based on metal oxides and poly(organophosphazenes)

New phosphazene-based chain extenders containing allyl and epoxide groups

“…Originally considered mostly as appropriate model compounds for testing the reactivity, structure and properties of the corresponding high molecular weight poly(organophosphazenes) (POP) [1,2], over the years they have attracted more and more interest as biomaterials [3,4], compounds for photochemical purposes (as photoinitiators [5,6] or photostabilizers [7 -11]), sol-gel precursors [12,13], core for dendrimers [14][15][16] or star polymers [17,18], starting products for cyclolinear and cyclomatrix polymers preparation [19], support for metal cluster [20] or for transition metal complex preparation [21][22][23], monomer for the synthesis of linear organic macromolecules with pendant cyclophosphazene moieties [24], re-retardant additives for commercial organic macromolecules [25], etc.…”

Poly(organophosphazene)s and the sol-gel technique

“…This alternative possibility uses the sol-gel technique, by incorporating MEEP in different metal oxide three dimensional net-works. 21,22,25,27,28,33,36,37 Accordingly, several different new composites have been prepared in this way: they are described briefly below.…”

“…33,36,37 This last fact was checked by solvent extraction tests carried out on both the MEEPOH/SiO 2 composite and on physical blends of the same compounds ( Fig. 5) and by DSC characterization experiments (Fig.…”

“…To achieve this aim we synthesized a new phosphazene copolymer, poly[bis(4-hydroxyphenoxy) 0.8 (2,2,2-trifluoroethoxy) 1.2 phosphazene], 36 by reaction of 4-methoxyphenoxy and 2,2,2-trifluoroethoxy anions (molar ratio 40:60) with polydichlorophosphazene, and successive deblocking of the methoxide units with BBr 3 to free the corresponding -OH groups. 66 The final copolymer has the chemical structure 8.…”

On the Preparation and Characterization of Polyethylene/Polyamide Blends by Melt Processing in the Presence of an Ethylene/Acrylic Acid Copolymer and of New Phosphazene Compounds

“…[14,15] Cyclo(organo)phosphazenes (CP) are low-molecularweight phosphazene derivatives, whose cyclic structure is formed by repeating -P--N units, each phosphorus bearing two substituent groups (usually, but not necessarily, organic in nature). CPs find applications in several fields such as biomaterials, [16,17] photochemistry, [18][19][20][21][22][23] sol-gel precursors, [24,25] core for dendrimers or star polymers, [26][27][28][29][30] preparation of linear organic macromolecules with CP moieties, [31] fire retardant additives. [32] CPs substituted with azide or 2-oxazoline groups have been used in the selective reticulation of polyolefins and in the chain extension of poly(ethylene terephthalate) (PET) and PA6.…”