Polyurethane:

Polyurethane:

Polyurethanes are made from a dialcohol and diisocyanate monomers. The isocyanate compounds contain the functional group (O=C=N-). A rearrangement reaction leads to the formation of the urethane linkage. Technically polyurethane is not a condensation polymer since no molecules are lost, but the functional group does rearrange.




A hydrogen moves from the alcohol to the nitrogen, while the oxygen links to the carbon. The urethane functional groups are similar to the amide group. In some applications the urethane polymer chains are further reacted to make cross links. Think of a chain link fence to get the idea of cross linking chains together.

Poly urethane an be drawn into fibers used in upholstery. Soft polyurethane foam can be used as padding in furniture and mattresses, while rigid foam is used as insulation in buildings.

Link to Polyurethane - with Chime molecule - Macrogalleria at U. Southern Mississippi




Condensation type Polymers
Demonstrations with Polymers