| http://www.w3.org/ns/prov#value | - Polyurethane is a copolymer which in a single chain molecule containing two segments of vast differences: one is stiff and polar, the hard segment; the other is rubbery and nonpolar, the soft segment on the molecular level, the copolymer is expanded, compared to a homogeneous polymer, as the polar and nonpolar segments, being dissimilar, have a smaller probability of sharing a common volume on the
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