Polyphosphazenes are an important class of inorganic macromolecule and have many commercial applications, e.g. fire retardants, elastomers, fuel cell membranes, biomedical applications. The scheme below shows synthetic routes to three polymers,
(a) Outline how (NPC12)„ is produced on a large scale starting from PC15 and NH4C1.
(b) What are the identities of the polymers A-C?
Microcry stall ine thermoplastic A
NaOCH2Cr3
McNH2
(NPCI2)„ Water-soluble glass B
H2NCH2CO2Et Biodegradable polymer C
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