condensation

• condensation polymers involve different monomers with 2 (same) functional groups

  so we lose small molecules such as water
• ethane diol:

  HO - CH2 - CH2 - OH

  (has 2 alcohol groups)
• hexanedioic acid:

  HOOC - CH2 - CH2 - CH2 - CH2 - COOH

  (has 2 carboxylic acid groups)
• reacting a carboxylic acid with an alcohol produces an ester and water

  to form a polyester, we react the 2 monomers together

  ethane diol + hexanedioic acid --> ester + water

  continue to add monomers = long polymer
• to represent the repeating unit:

  • pick 2 adjacent monomer units
  • draw brackets so the bond passes through
  • add 'n' to the right