Discussion
Match each polymer with the mechanism by which it is made.
List I
A. Polyethylene
B. Nylon 66
C. Polyester
D. Polystyrene
List II
1. condensation between an acid and an alcohol
2. addition across a double bond
3. addition of a vinyl monomer
4. condensation with loss of water
Answer: B
Correct answer: A-2, B-4, C-1, D-3
Two addition polymers and two condensation polymers. Polyethylene and polystyrene grow by addition across the monomer’s double bond, with nothing eliminated and the repeat unit having the same composition as the monomer. Nylon 66 forms by condensation between a diamine and a diacid with loss of water, and polyester by condensation between a diacid and a diol - and in both cases the small molecule must be removed to drive the chain to high molecular weight.
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