what is polyurethane made of
Polyurethane synthesis, wherein the urethane groups â NH-(C=O)-O-link the molecular units. Polyurethane (PUR and PU) is a polymer composed of organic units joined by carbamate (urethane) links.olyurethanes, especially those made using aromatic isocyanates, contain chromophores that interact with light. This is of particular interest in the area of polyurethane coatings, where light stability is a critical factor and is the main reason that aliphatic isocyanates are used in making polyurethane coatings.