How is phosphazene synthesized?
Poly(alkyl/aryl)phosphazenes [NPR2] n with the organic substituent directly attached via a P–C bond from [NPCl2] n can be synthesised via substitution with suitable organic nucleophiles such as RMgX or RLi.
What are phosphazenes give general formula of phosphazene?
Phosphazenes refer to classes of organophosphorus compounds featuring phosphorus(V) with a double bond between P and N. One class of phosphazenes have the formula RN=P(NR2)3. These phosphazenes are also known as iminophosphoranes and phosphine imides.
What are the properties of phosphazene?
Although the substituents are the main influence on the polymer’s physical properties, phosphazene polymers can provide the following characteristics: Bio-compatibility, Flexibility, High Dipole Moment, Broad Range of Tg (glass transition temperature), Chemical Inertness, Mechanical Strength, Solvent Permeability or …
What is Cyclophosphazene linear?
Cyclophosphazenes and linear polyphosphazenes are unique inorganic–organic hybrid polymers consisting of an alternating phosphorus–nitrogen (−R2P═N−)n backbone.
What are the primary degradation products of poly phosphazene?
Polyphosphazenes are attractive because they have been shown to degrade into nontoxic byproducts that are easily metabolized by the body. In the case of an amino acid ester phosphazenes, these hydrolytic degradation products include the amino acid, the corresponding alcohol of the ester, ammonia, and phosphates [37].
What are Polyphosphazene used for?
Description. Polyphosphazenes are polymers containing nitrogen as part of their backbone; they are commonly used in O-rings, pipelines, and seals in oil, fuel delivery, and storage systems.
What is the hybridization of phosphorus in phosphazene?
The four sp3 hybrid orbitals housing four electrons for phosphorous are used for σ-bonding leaving a fifth electron occupy a d orbital. As shown in fig. (a) resonance structures can be drawn to those for benzene indicating aromaticity of the ring. Unlike benzene π-bonding in phosphazene involves dπ-pπ bonds.
What is the oxidation state of phosphorus in phosphazene?
PHOSPHAZENES OR PHOSPHONITRILIC HALIDES. Nitrogen and phosphorus catenate together, forming an interesting series of polymers containing P-N single bonds and P=N double bonds. In these compounds, the phosphorus atom is in a +5 oxidation state, and the nitrogen atom is in a +3 oxidation state.
What are the applications of silicones?
Applications of Silicones
- Personal Care Products. Silicones are widely used in personal care products.
- Construction Materials.
- In Electronics.
- Solar Panels and Photovoltaic devices.
- Aviation Industry.
- Kitchenware.
- Paints and Coatings.
- Sporting Apparels and Goods.
What is Polyphosphazene used for?
Polyphosphazenes are polymers containing nitrogen as part of their backbone; they are commonly used in O-rings, pipelines, and seals in oil, fuel delivery, and storage systems.
What is polymeric backbone silicones?
The backbone is a chain of alternating silicon and oxygen atoms. Each silicone has two groups attached to it, and these can be any organic groups. The picture at the top of this page shows methyl groups attached to the silicon atoms. This polymer is called polydimethylsiloxane. It is the most common silicone.
What are Phosphonitrilic polymers?
Such phosphonitrilic halide polymers of high molecular weight are generally linear in structure and are observed to possess elastomeric properties and hence are often termed inorganic rubbers.
What is the oxidation state of phosphorus in h3 PO 3?
+3
∴ Oxidation number of P in H3PO3=+3.
Who invented silicone?
Franklin Hyde
Franklin Hyde, a chemist who decades ago turned a useless sticky goo into a common family of industrial raw materials called silicones and who also invented a process for making an almost-pure glass used today in fiber optic technology, died Monday at his home on Marco Island, Fla. He was 96. Dr.
Is polysiloxane a silicone?
Polysiloxanes, or silicones, are a general category of polymers consisting of a silicon-oxygen backbone with organic groups, typically methyl groups, attached to the silicon atoms (Colas and Curtis, 2004). Certain organic side groups can be used to link two or more chains together.
Which catalyst is used in preparing polysiloxane?
Copper is used as a catalyst in the form of CuO, as shown in the reactions (4), (5), (6) and (7). The main and most important product from this direct reaction is the dimethyl – dichloro – silane, (CH3)2SiCl2.