Polyamides are polymers that contain many amide groups. These groups form when a carboxylic acid reacts with an amine.

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Presentation transcript:

Polyamides are polymers that contain many amide groups. These groups form when a carboxylic acid reacts with an amine.

Polyamides are polymers that contain many amide groups. These groups form when a carboxylic acid reacts with an amine.

Polyamides are polymers that contain many amide groups. These groups form when a carboxylic acid reacts with an amine.

Water is eliminated in the reaction, which is called a condensation reaction.

The carboxylic acid and amine are linked by an amide group, –CONH–.

Polyamides are formed by the reaction between a dicarboxylic acid and a diamine.

Water is again eliminated in the reaction.

The dicarboxylic acid and diamine are linked by an amide group.

Notice that there is a carboxyl group on one end of the molecule and an amino group on the other end.

Notice that there is a carboxyl group on one end of the molecule and an amino group on the other end.

Notice that there is a carboxyl group on one end of the molecule and an amino group on the other end.

Notice that there is a carboxyl group on one end of the molecule and an amino group on the other end.

These can react with more diamine and dicarboxylic acid molecules.

When this happens, a polyamide forms.

Nylon is a polyamide. Many monomer units are present in a single polymer chain.

1,6-diaminohexane is a diamine that can form a polyamide with a dicarboxylic acid.

Hexane-1,6-dioic acid is a dicarboxylic acid that can form a polyamide with a diamine.

What is the repeating unit of the polyamide formed if n monomer molecules react together?

What is the repeating unit of the polyamide formed if n monomer molecules react together?

What is the repeating unit of the polyamide formed if n monomer molecules react together?

Water is formed in the reaction.

A polyamide with this repeating unit is also formed in the reaction.

The polyamide formed is called nylon-6,6.

This is because there are six carbon atoms in the original diamine …

… and six carbon atoms in the original dicarboxylic acid.

This is the repeating unit of nylon-5,10.

It would be formed from 1,5-diaminopentane, which has five carbon atoms …

… and decane-1,10-dioic acid, which has 10 carbon atoms.

Different nylons have different properties.