3.12 Polymers
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What is condensation?
Small molecule eliminated (usually H2O) to form a larger molecule
How many monomers are condensation polymers usually formed from?
Two
What properties do these monomers forming condensation polymers have?
Each has two functional groups
Examples of condensation polymers?
Polyesters Polyamides Polypeptides
What is the linkage in a polyester?
Slide 12
What molecule is eliminated in formation of a polyester?
H2O
What are the two monomers which form a polyester (generic names and structures)?
Diol and dicarboxylic acid or a molecule with both alcohol and a carboxylic acid functional groups
Draw a generic repeating unit for a polyester
Slide 18
Which monomers is terylene made from?
Slide 20
Draw a repeating unit of terylene
Slide 22
What is terylene used for?
As a fibre for making clothes
What is the linkage in a polyamide
Slide 26
Which molecule is eliminated when a polyamide is formed
H2O
What are the two monomers used to form a polyamide (generic names and structures)?
Diamine and dicarboxylic acid
Examples of polyamides
Nylon, Kevlar
Which monomer is nylon-6,6 made from
1,6-diaminohexane Hexanedioic acid
Draw the repeating unit of nylon-6,6
Slide 36
If you are making Nylon in the lab, what monomers would you use and why? What molecule is eliminated?
Use hexane-1,6-diacyl chloride as the rate of reaction is much faster.HCl is eliminated
What is Kevlar used for?
In body armour Helmet Oven gloves
Which monomer is Kevlar made from?
Slide 42
What is the repeating unit of Kevlar?
Slide 44
Why is Kevlar so strong
Rigid chains and close packing of flat aromatic rings
What are polypeptides? What is the linkage?
Same linkage as polyamides. But made from just one amino acid monomer
Draw a peptide
Slide 50