Making a polyester
2 marks · NormalState the names of the two different types of monomers that react together to form a polyester. For each type, give one example.
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Diol (example: ethane-1,2-diol) and dicarboxylic acid (example: hexane-1,6-dioic acid).
Also accept: 1. Diol (e.g., propane-1,3-diol) and dicarboxylic acid (e.g., ethane dioic acid).
Common mistakes: Names only addition polymerisation monomers (e.g., ethene).; Does not provide an example.
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Marking points
B1 · 1 mark · States both correct types: diol and dicarboxylic acid.
B2 · 1 mark · Gives a correct example of each type of monomer.
Worked solution
The two types of monomers are: - Diol; example: ethane-1,2-diol - Dicarboxylic acid; example: hexane-1,6-dioic acid