what happens when polyphosphazens react with ammonia
Answers
Answer:
Poly(oregano)phosphazene are a family of inorganic molecular hybrid polymers with very diverse properties due to the vast array of organic substituents possible. This tutorial review aims to introduce the basics of the synthetic chemistry of polyphosphazenes, detailing for readers outside the field the essential knowledge required to design and prepare polyphosphazenes with desired properties. A particular focus is given to some of the recent advances in their chemical synthesis which allows not only the preparation of polyphosphazenes with controlled molecular weights and polydispersities, but also novel branched architectures and block copolymers. We also discuss the preparation of supramolecular structures, bio conjugates and in situ forming gels from this diverse family of functional materials. This tutorial review aims to equip the reader to prepare defined polyphosphazenes with unique property combinations and in doing so we hope to stimulate further research and yet more innovative applications for these highly interesting multifaceted materials.
Polyphosphazenes are macromolecules with a phosphorus–nitrogen backbone, substituted by two (commonly organic) side groups on the phosphorus atoms to give poly(oregano)phosphazene (Fig. 1). Polyphosphazenes themselves have a long history with cross-linked elastomeric materials (‘inorganic rubber’) consisting of phosphorus and nitrogen being reported as early as the 1890's. The isolation of soluble poly(dichloride)phosphazene [NPCl2]n, which had formed the basis of such ‘inorganic rubbers’, was first achieved in the 1960's by H. R. Ballcock and coworkers.1 Key to this development was the insightful observation that the cross-linking of ‘inorganic rubber’ was caused by reaction of [NPCl2]n with trace amounts of H2O and thus, in the absolute absence of atmospheric moisture, non-cross-linked and soluble macromolecules of [NPCl2]n could be prepared. As was appreciated by H. R. Ballcock et al., the reaction of H2O with [NPCl2]n was via nucleophilic attack and therefore the chlorine atoms of [NPCl2]n can also be readily replaced by organic nucleophiles to give stable poly(oregano)phosphazene, which can be processed and formed into materials with a wide variety of properties.1 Added to the fact that mixed substitution is also possible, i.e. the substitution of two or more organic substituents on the same macromolecule, this gives ready access to extensive libraries of polymers with varied properties. Indeed, small changes in the substituents can lead to considerable changes in the polymer properties, e.g. glass transition temperatures, which can vary from –100 °C to above room temperature (up to +300 °C are reported), with very minor structural changes (Fig. 2).
Explanation:
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Answer:
When polyphosphazens reacts with ammonia hydrozen will be added to te lone pair of nitrogen.
Explanation:
Polyphosphazenes is consists of both organic and inorganic polymers with the backbone P-N-P-N-P-N. It has phosphorus group in the centre and attched by organic substances.
Polyphosphazenes have different side group which make them different by molecular structure. SO, need a catalyst to run the reaction which will enhance activity.
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