Question: A urethane linkage occurs when an alcohol adds across the carbonnitrogen double bond in an isocyanate: Polyurethanes are formed from the copolymerization of a diol

A urethane linkage occurs when an alcohol adds across the carbon€”nitrogen double bond in an isocyanate:

Polyurethanes are formed from the copolymerization of a diol with a diisocyanate. Polyurethanes are used in foamed insulation and a variery of other construction materials. What is the structure of the polyurethane formed by the following reaction?

N-R Alcohol Isocyanate Urcthanc HOCH.CH.OH + O=C=N- ,N

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