Polyurethane - Wikipedia
Since a polyurethane contains two types of monomers, which polymerize one after the other, they are classed as alternating copolymers. Both the isocyanates and polyols used to make a polyurethane contain two or more functional groups per molecule.
Introduction to Polyurethane Chemistry - ACS Publications
2021年5月19日 · Acrylic polyols are another group of polyols widely used for the preparation of polyurethanes. Acrylic polyols are synthesized through a radical addition reaction at their unsaturation to form a copolymer. At least one of the monomers must present a hydroxyalkyl group to react with isocyanate.
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. Most polyurethanes do not melt upon heating and can, therefore, be classified as thermosetting polymers .
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).
Polyurethane (PU): Structure, properties, and applications
2024年1月1日 · Polyurethane (PU) stands as a pivotal material in various industries due to its accessibility in monomer form, straightforward synthesis, and versatile applications. Renowned for its exceptional mechanical strength, long-lasting durability, and cost-effectiveness, PUs have become ubiquitous and extensively studied materials worldwide.
Polyurethanes: Structure, Properties, Synthesis, Characterization…
2017年1月1日 · Polyurethane differs from normal polymers in that there are no urethane monomers. The chemical linkage existing in the polymer is denoted as urethane (–NHCOO–) and is the most reactive moiety in the polyurethane.
Structural Analysis of Polyurethane Monomers by Pyrolysis GC
2019年4月9日 · In this study, we developed a method to analyze unknown polyurethane samples using pyrolysis gas chromatography time-of-flight mass spectrometry (Py-GC-TOFMS) with dopant-assisted atmospheric pressure chemical ionization (dAPCI). A set of standard polyurethane foams produced with several different monomers are analyzed by Py-GC-TOFMS.
Polyurethane and Its Derivatives | SpringerLink
2018年11月14日 · The targeted PU properties for different applications can be achieved by changing the base monomers and their ratios as well as different synthesis process. This chapter highlights the PU application, its chemistry, and its base monomers.
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. The chapter also deals with the phase separation process of polyurethane and the effect of ...