Polyurethane Precursors

This article intends to provide a basic knowledge of polyurethanes (PUs) and their typologies, with particular reference to starting materials, both from a scientific and a commercial point of view. The possible types of PUs are described in short, together with their methods of production. Safety, ecological items, and recycling are considered as well. As a final point, the advantages of the use of PUs in composites production are highlighted, with an indication of the reinforced PU production processes.