Condensation polymerisation Process

When 2 monomers react: 1) 2 monomers of different functional groups needed 2) A small molecule (usually water) produced as a by-product 3) Polyesters: Manmade or Biological 4) Making Polyester: monomer which has 2 hydroxyl groups (-OH) + another monomer which has 2 carboxylic groups (-COOH)