Hybrid phosphazene-organosilicon polymers: II. High-polymer and materials synthesis and properties

Role of the Linking of Metallic Centers to Macromolecular and Oligomeric Systems in the Pyrolytic Products

“…The incorporation of silicon containing fragments to the polyphosphazene chain could afford, after pyrolysis, metallic nanostructures inside SiO 2 . However as pointed by Allcock [33][34][35] the incorporation of silicon organometallic fragments to the polymers chain is not easy. Another way could be by using the silicon source as a molecular compound as t Cl under air and at 800 °C affords a white solid in a 30 % of yield .…”

Poly(organophosphazene)s and the sol-gel technique

“…[1][2][3][4][5][6] In this work, which has been highlighted by a number of reviews, [7][8][9][10] it was stressed that several strategies exist to prepare new silicon/phosphazene hybrid materials, mainly based on the use of:…”

“…(1) substitution reactions of (NPCl 2 ) n or (NPF 2 ) n halogens with silanolates, 10 amino-organosilanes 11 or organosilyl Grignard or lithium reagents; 12 (2) functionalizations of previously synthesized phosphazene macromolecules (POPs) using, for instance, hydrosilylation processes 13 or deprotonated phosphazene reactions with organosilicon halides; 14 (3) surface modification of polyphosphazene films with siloxanes; 15 (4) formation of blends 10,16 or of interpenetrating polymer networks 10 between these two types of polymeric materials; (5) grafting processes of polysiloxanes onto polyphosphazene matrices. [17][18][19] All these investigations led to the preparation of a remarkable number of polyphosphazenes functionalized with both low-molecular-weight linear or cyclic silicon-containing molecules, and to the synthesis of high-molecular-weight phosphazene/ siloxane mixed materials.…”

“…In the field of poly(organophosphazene)s, this approach to the preparation of hybrid materials was explored by Ferrar, [21][22][23][24][25][26][27][28] by Allcock 10 and by our group [29][30][31][32][33][34][35][36][37][38] to synthesize new ceramics exhibiting ionic conductivity [21][22][23][24][25][26][27][28]33,36,37 and optical absorption in the visible range of the spectrum, 31 together with improved thermal and mechanical resistance 21,22,25,[27][28][29][30]32,36 , film-and fiber-forming capability, 21,22,25,27,28 high flexibility of protective coatings, 36 etc. Here we critically highlight the work done on the utilization of the sol-gel technique in the case of poly(organophosphazene)s and discuss the chemico-physical characteristics of the resulting hybrid materials.…”