3.3.12 Condensation Polymers
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What is a polyester?
A long chain polymer formed by the condensation polymerisation of dicarboxylic acids and diol compounds
What are the common uses of polyesters?
Clothing Food packaging Plastic bottles Soap Detergent Shampoo
What conditions are required to produce polyesters?
Sulfuric acid and heat
Why are polyesters called as such?
An ester bond is formed during polymerisation (oxygen connected diagonally)
What are the three types of condensation polymers?
Polyesters, polyamides and polypeptides
How are polyesters formed?
The OH of the dicarboxylic acid joins with the hydrogen of the diol to form water The carboxylic acid carbon then joins with the oxygen of the diol This forms the ester linkage -COO-
How are polyamides formed?
A diaminoalkane reacting with a dicarboxylic acid They have the amide linkage -CONH- The OH of the carboxylic acid joins with the amine group
How are polypeptides formed?
The OH of the carboxylic acid group joins with the hydrogen of the amino group This forms a -CONH- linkage group
Which monomers are used to make nylom?
1,6-diaminohexane and hexane-1,6-dicarboxylic acid
What are the monomers for kevlar?
Benzene-1,4-diamine and benzene-1,4-dicarboxylic acid
What is the shape of kevlar, terylene and nylon?
See card
Why do polamides have higher melting points than polyesters?
The N-H forms hydrogen bonds with C=O on other chains