Question
With the help of suitable chemical equations explain how the mixed-substituent polymers of phosphazenes are synthesized?
Answer :
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Mixed-substituent polymers of phosphazenes are synthesized by the controlled substitution of chlorine atoms present in polyphosphazene chains by two different organic or inorganic substituent groups. The most common starting material is poly(dichlorophosphazene), ((NPCl_2)_n), which is obtained by thermal ring-opening polymerization of hexachlorocyclotriphosphazene. The synthesis begins with the preparation of cyclic phosphazene trimer: [ 3NPCl_2 \rightarrow (NPCl_2)_3 ] Hexachlorocyclotriphosphazene undergoes ring-opening polymerization on heating to form linear poly(dichlorophosphazene): [ n(NPCl_2)_3 \xrightarrow{\Delta} (NPCl_2)_n ] The chlorine
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