[Mark S 2014]

Can anyone make clear the difference between polypeptides and polyamides for me ?

[Corribus]

If you were to draw a Venn diagram, you'd see that polypeptides are a certain class of polyamides. Polypeptides are natural polyamides. Nylon is a synthetic polyamide. A polyamide is just a polymer formed from monomer units which lead to repeating amide bonds. Amino acids form repeating amide bonds to make polypeptides and proteins, which are natural oligoamides / polyamides.

[Mark S 2014]

Thanks, I sort of came to that conclusion myself but there wasn't much on the web to confirm it. Great answer.