1. Condensation Polymerisation

2. When condensation polymerisation takes place, the monomer molecules join to make the polymer molecule and water.
Condensation polymers are made from monomers with two functional groups per molecule.
Carboxyl group in acids
Amino group
Ester group
-OH
Hydroxyl group in alcohols
R = the rest of the molecule

3. The Ester Linkage
When a carboxylic acid and an alcohol react, a water molecule is removed, and an ester molecule is formed.

4. Polyesters
Polyesters are examples of condensation polymers that contain many ester linkages.
formed from alcohols with two -OH groups, one at either end of the molecules and acids with two –COOH groups, one at either end of the molecule.

5. The polyester molecules can continue to grow in both directions.
The acid and alcohol group join together.
The acid group loses an –OH and the alcohol loses an –H to form water and a new bond forms between the monomer units.

6. Amines
The amines belong to a homologous series based on the alkanes in which a hydrogen has been replaced with -NH2.
The functional group in the amine family is the amine or amino group ‑NH2.

7. Polyamides
Polyamides are polymers formed from molecules with amine groups (-NH2) and molecules with carboxyl groups (-COOH).

8. The carboxyl group and the amino group can join together with the loss of water.
The (-CONH) link shown below is called an amide (or peptide) link and the polymer is called a polyamide.

9. Nylon
Nylon is a polyamide that can be made from two different monomer units.
One is a diacid; the other is a diamine.