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 What does the designation '6,6' in nylon 6,6 polymer mean ? 

monomers of NYLON 6,6 i.e.hexa methylene diamene {H2N-(CH2)6-NH2} and adipic acid {HOOC-(CH2)4-COOH} both contain 6 carbons each and therefore NYLON is named as NYLON 6,6...............


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Nylon 6,6 is made of hexamethylendiamene and adipic acid, which give nylon 6,6 a total of 12 carbon atoms, and its name.

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The designation 6,6 in NYLON 6,6 represents the number of carbon atoms in their monomers.i.e.in hexamethylene diamine{NH2-(CH2)6-NH2} and adipic acid{COOH-(CH2)4-COOH}

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The monomer of Nylon-6,6 are adipic acid nd hexamethylenediamene.Both these structures have 6 carbon each.So.the compound formed by their polymerisation is called Nylon 6,6

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