Answer:
These numbers indicate the number of
carbon atoms in the monomer units involved in the two varieties of nylon.
nylon 66 : Adipic acid (six 'C' atoms)
and hexamethylene diamine (six 'C' atoms)
nylon 6 : \[\varepsilon \]-Aminocaporic
acid. (six 'C' atoms)
For further details, consult section
16.6.
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