The relationship between polyesters and polyurethanes

Polyesters are a general term for polymers obtained by the polycondensation of polyols and polyacids, while polyurethanes are short for polyaminoethers; they belong to the category of polymers. However, due to the wide range of applications of polyurethanes, today the term polyester generally refers to materials such as PET and polyarylates, with polyurethanes being classified as a separate category

Polyesters are a large category, and polyurethanes are a type of polyester. Polyesters can be classified into bottle-grade polyesters, film-grade polyesters, as well as various modified and differentiated polyesters, depending on their intended use.

Polyurethane belongs to the category of polyesters. It is the most widely used product among polyesters

Polyesters and polyurethanes do not belong to the same category of polymers. Polyesters are a general term for polymers formed by the polycondensation of diols or polyols with dicarboxylic acids or polycarboxylic acids; they include polyester resins, polyester fibers, polyester adhesives, and so on. Its main products are polyester long and short fibers, as well as bottle and film products, which are primarily used in industries such as packaging, electronics, and healthcare. Polyurethane is a polymer made from polyisocyanates and polyether polyols or polyester polyols and/or small-molecule polyols, polyamines, or chain extenders/crosslinking agents such as water. It is mainly used for thermal insulation in automobiles, refrigerators, piping systems in buildings, etc., as well as in leather processing, shoe manufacturing, and (waterproof) coatings. It is also utilized in everyday furniture such as mattresses and sofas, as well as in the soilless cultivation of agricultural products. For reference!

Polyurethanes can be obtained by modifying polyesters with materials containing -NCO groups

It is the most widely used type among polyesters.