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Many polymers are formed not only by chain-growth processes, but also by transformations of polyfunctional reactants.
When polymers are created by losing a small byproduct, such as water, and generally (but not always) combine two different components in an alternating structure, this is condensation polymerization.
The polyester Dacron and the polyamide Nylon 66, shown here, are two examples of synthetic condensation polymers, also known as step-growth polymers.
As opposed to chain-growth polymers, most of which grow by carbon-carbon bond formation, step-growth polymers usually grow by carbon-non carbon atom bond formation (C-O and C-N in Dacron and Nylon respectively).
How they are created
