Do you know a lot about polyamids and polyesters? If so can you tell me the difference between an amide link and an

Question: Do you know a lot about polyamids and polyesters? If so can you tell me the difference between an amide link and an ester link? it would also help me if you could shed some more light on what carboxylic acid is?
- Keywords:
  acid,
  carboxylic,
  ester,
  polyamid,
  polyester
Asked by nobelprizematt to Julia on 14 Jun 2011.
- Julia Griffen answered on 14 Jun 2011:
  
  Hi Nobel Prize Mattt… Good question… well lets try to answer this with out drawings… Going from your previous questions I;m persuming your A level?? So i’m taking a few presumtions.. So its all functional group stuff…
  
  So polyesters are formed by the condensation (loss of water) reaction betwteen an ester and an alcohol. The resulting link between the repeating units of the monmers are an ester.
  
  Polyamides, are formed by the condensation reaction between an amine (NH2) and an alcohol, and as a result for a peptide link between the monomers units.
  
  So amide links contain nitrogen! the key difference!
  
  A carboxylic acid is the functional group R-CO2H. Where the carbon has a double bond to one oxygen and a single bond to OH.
  
  This is really difficult to explain without diagrams… would you like anything clarified>

Question: Do you know a lot about polyamids and polyesters? If so can you tell me the difference between an amide link and an ester link? it would also help me if you could shed some more light on what carboxylic acid is?