Polyurethane - Wikipedia
Polyurethane (/ ˌ p ɒ l i ˈ jʊər ə ˌ θ eɪ n,-j ʊəˈr ɛ θ eɪ n /; [1] often abbreviated PUR and PU) refers to a class of polymers composed of organic units joined by carbamate (urethane) links.
Polyurethane | Foam, Synthesis, Plastics | Britannica
2024年11月12日 · Polyurethane, any of a class of synthetic resinous, fibrous, or elastomeric compounds belonging to the family of organic polymers made by the reaction of diisocyanates (organic compounds containing two functional groups of structure ―NCO) with other difunctional compounds such as glycols.
Polyurethanes are an immensely versatile class of polymers used in insulators, foams, elastomers, synthetic skins, coatings, adhesives, and so forth. Polyurethane was first developed through basic diisocyanate polyaddition reactions by Dr. Oto Bayer and partners (1).
What is Polyurethane? Composition, Preparation, Properties
Polyurethane, often abbreviated to PU or PUR, is an organic polymer that features many organic units linked via urethane molecules. Learn about polyurethanes, their properties, and their uses here.
Polyurethanes (PUs) are polymeric materials that contain a urethane linkage [NH–C(O)–O]. They are formed by the reaction between components containing hydroxyl (–OH) groups, such as components that contain polyol and isocyanate (–N=C=O).
The chemistry of polyurethanes - li
Polyurethane (PUR and PU) can be found virtually everywhere. In this article, we introduce the basics of polyurethane chemistry and discuss the raw materials used to manufacture them.
Polyurethanes: Structure, Properties, Synthesis, Characterization…
2017年1月1日 · The chapter gives an introduction to the polyurethane (PU) polymer, its synthesis and its structure. The chapter details the different methods of polyurethane synthesis, various starting materials and the necessary components required for PU synthesis.
Polyurethanes - Essential Chemical Industry
Polyurethanes are made by the exothermic reactions between alcohols with two or more reactive hydroxyl (-OH) groups per molecule (diols, triols, polyols) and isocyanates that have more than one reactive isocyanate group (-NCO) per molecule (diisocyanates, polyisocyanates).
PU are formed by chemical reaction between a di/poly isocyanate and a diol or polyol, forming repeating urethane groups, generally, in presence of a chain extender, catalyst, and/or other additives. Often, ester, ether, urea and aromatic rings are also present along with urethane linkages in PU backbone. 2.1. Isocyanates
Polyurethane (PU): Structure, properties, and applications
2024年1月1日 · Polyurethanes (PU) are an inevitable class of versatile polymeric material comprising carbamate (urethane) organic units links. Polyurethane polymers are formed by reacting polyol with a di- or tri-isocyanate.