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.
How can NPF2 3 Be Prepared?
(NPF2)n is prepared by polymerization of the trimer, (NPF2)3, which itself is obtained from (NPCl2)3 by treatment with sodium fluoride.
What is the 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.
Which catalyst is used in preparation of 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.
How do you synthesize polysiloxane?
Linear polysiloxane can be synthesized by both anionic and cationic polymerizations of cyclic siloxanes such as hexamethylcyclotrisiloxane (n = 3) and octamethyl cyclotetrasiloxane (n = 4). Anionic polymerization is initiated by hydroxide, alkoxides, phenolates, silanolates and siloxoanolates.
How is polysiloxane made?
Polysiloxanes (frequently referred to as silicones) are typically prepared by the hydrolysis of alkylsilicon or arylsilicon halides.
What are phosphazenes give an example?
They are superbases. Another class of compounds called phosphazenes are represented with the formula [X2PN]n, where X = halide, alkoxide, amide. One example is hexachlorocyclotriphosphazene. Bis(triphenylphosphine)iminium chloride is also referred to as a phosphazene.
What are silicones and Phosphazenes?
SILICONES AND PHOSPHAZENES. groups may be attached to a skeletal atom. This will affect the flexibility of polymers, their ability to react with chemical reagents and interactions with other polymers. are two important class of polymers with high commercial potential.
What are Phosphonitrilic halides?
⭕PHOSPHONITRILIC HALIDES are the compounds form X2P=N, or polymers thereof,where X is halogen. ⚫In the X2P=N structure,there are two important resonance structure: ✔One has triple bond between P and N,so that P is hypervalent. ✔the monomer is not stable,but the amorphous polymeric form is known.
What do you mean by 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. They are superbases.