Polyurethanes are produced using various types of isocyanates, such as tolylene diisocyanate (TDI), hexamethylene diisocyanate (HDI), and dicyclohexylmethane diisocyanate (HMDI). Most of these isocyanates are low-viscosity liquids at room temperature, whereas 4,4′-diphenylmethane diisocyanate (MDI) is a crystalline solid.

Aromatic isocyanates are generally more reactive than aliphatic isocyanates and are widely employed in the manufacture of polyurethane foams, coatings, and elastomers. Furthermore, the cyclic structures present in aromatic and alicyclic isocyanates increase the molecular rigidity of polyurethane materials, helping enhance their mechanical properties.

Polyurethane Chemical Properties

Product Application of Polyurethane CAS#9009-54-5

Polyurethane is used in various fields, including the manufacture of prosthetic devices such as internal bone splints.

Polyurethane resins and foams are essential industrial polymers that can be produced in rigid, semi-rigid, and flexible foam forms, as well as resin-based materials. Their versatility supports a broad range of commercial applications, including furniture, bedding, automotive sealing materials, adhesives, carpets, packaging, coatings, and many other products.

Polyurethane is valued for its excellent resistance to oils, light, and solvents, along with its high strength and flexibility. These polymers are formed through polyaddition reactions between diisocyanates and polyhydroxyl compounds, such as polyols.