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- Soft janus, wrinkles and allPublication . Trindade, A. C.; Patricio, Pedro; Teixeira, Paulo; Brogueira, Pedro; Godinho, Maria HelenaRight 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.