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Right now you are probably sitting on a comfy cushion. This is most likely filled with polyurethane (PU) foam. PUs are very long molecules made up of many repeating units. If the repeating units are prepolymers-intermediate-mass building blocks-with more than two reactive end groups, a three-dimensional network will form-a rubber, or elastomer, which can behave elastically depending on the degree of network cross-linking.
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General Physics and Astronomy
