A polyurethane contains repeated connections of the form . Suitable hydroxy groups and isocyanate groups can produce those connections by polyaddition; exactly two suitable groups per feed molecule give the bifunctional linear model only when competing reactions and ring closure are excluded.
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Polyurethane is a versatile polymer composed of organic units joined by carbamate (urethane) links. It can be formulated as a flexible or rigid material, depending on its chemical composition and processing. The properties of polyurethane can vary significantly based on the types of polyols and isocyanates used in its production.