5/23/2023 0 Comments Polyurethane injection systemBoth the isocyanates and polyols used to make a polyurethane contain two or more functional groups per molecule. Since a polyurethane contains two types of monomers, which polymerize one after the other, they are classed as alternating copolymers. Ī polyurethane is typically produced by reacting an isocyanate with a polyol. Foams are the largest application accounting for 67% of all polyurethane produced in 2016. These include rigid and flexible foams, varnishes and coatings, adhesives, electrical potting compounds, and fibers such as spandex and polyurethane laminate (PUL). This chemical variety produces polyurethanes with different chemical structures leading to many different applications. In contrast to other common polymers such as polyethylene and polystyrene, polyurethane is produced from a wide range of starting materials. Polyurethane ( / ˌ p ɒ l i ˈ jʊər ə ˌ θ eɪ n, - j ʊəˈr ɛ θ eɪ n/ often abbreviated PUR and PU) refers to a class of polymers composed of organic units joined by carbamate (urethane) links. A kitchen sponge made of polyurethane foam
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