Step-Growth Polymers

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Last updated 10:46 PM on 8/28/26
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5 Terms

1
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Polyesters

React a dicarboxylic acid with a diol. The repeated functional group is an ester and the byproduct is water. The dicarboxylic acid may also be replaced with an acid chloride.

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Polyamides

React a dicarboxylic acid with a diamine OR combine two amino acids. The repeated functional group is an amide and the byproduct is water. The dicarboxylic acid may also be replaced with an acid chloride.

3
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Polycarbonates

React a diol with a phosgene. The repeated functional group is a carbonate and the byproduct is hydrochloric acid.

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Polysiloxanes

React water with a silyl dichloride to form a dihydroxysilane that then polymerizes. The repeated functional group is a siloxane and the byproduct is first hydrochloric acid, then water.

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Polyurethanes

React an isocyanate (N=C=O) with an alcohol. The repeated functional group is a carbamate (basically a secondary amine plus a carboxylic acid) and there is no byproduct.