What is the chemical structure of polyurethane
Plastics to get to know:
Polyurethanes (abbreviated to PUR) are extremely versatile plastics that are accordingly used in many different areas. Polyurethanes are mainly used as foam, e.g. for upholstered furniture, mattresses, sponges, winter clothing, coating of carpets, construction foam for thermal insulation, packaging material ...
But polyurethanes are much more than foam: They can also be used as paints and adhesives, as thermoplastics for the production of rollers, cylinders, etc., as elastomers and as fibers, e.g. as elastane.
But now to chemistry: Polyurethanes contain urethane bonds:
They are produced in a polyaddition reaction from dialcohols and diisocyanates, whereby polyethers such as polyethylene glycol are often used instead of the dialcohols. A frequently used polyurethane is, for example, the following:
If higher-valent alcohols are used instead of dialcohols, thermosets, solid, stable, cross-linked plastics that are used in paints for furniture, floors and boats and in printing inks are obtained.
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