Condensation polymerisation- polyamides 56-57

Question 1

Polyamides are made by reacting together two different monomer units, or one monomer unit. Describe both routes to making a polyamide.

Answer 1

Polyamides are made by reacting together two monomers: - one monomer is a dicarboxylic acid with two -COOH groups. - the other monomer is a diamine with two -NH₂ groups. Polyamides made by reacting just one type of monomer unit containing both -COOH and -NH₂ groups.

Question 2

Write the formation of a polyamide from diamine and dicarboxylic acid monomers.

Answer 2

Question 3

Write the reaction for the formation of a polyamide from an amino acid monomer.

Answer 3

Question 4

During condensation polymerisation for polyamides what happens to the bonds of the functional groups?

Answer 4

• A bond forms between an amine group on a diamine and a carboxylic group on a dicarboxylic acid.
• An amide linkage forms and water is eliminated.

Question 5

What are some properties of kevlar and what are its uses?

Answer 5

Kevlar is fire resistance and has a higher strength than steel.

• Kevlar is used to mae protective clothing-for fire fighters, bullet proof vests and crash helmets.

Question 6

Where is nylon 6,6 used?

What are its properties?

Answer 6

• Nylon 6,6 is used in tennis rackets and balloons.
• Nylon 6,6 has a high strength.

Question 7

Write out the polymerisation reaction of nylon 6,6.

• Name the reactants used.

Answer 7

• 1,6 diaminohexane
• Hexane-1,4-dioic acid

Question 8

Write out the polymerisation reaction for the formation of the polyamide kevlar.

• Name the reactants

Answer 8

• Benzene-1,4,-dioic acid
• Benzene-1,4-diamine