Isocyanate - Wikipedia
If a diisocyanate is treated with a compound containing two or more hydroxyl groups, such as a diol or a polyol, polymer chains are formed, which are known as polyurethanes. Isocyanates react with water to form carbon dioxide: This reaction is exploited in tandem with the production of polyurethane to give polyurethane foams.
异氰酸酯 - 维基百科，自由的百科全书
异氰酸酯 是一类由 异氰酸 衍生出的 酯，通式为R- N = C = O，是 氰酸酯 R-O-C≡N的 异构体。 根据分子中酯基个数的不同，可分为单异氰酸酯、二异氰酸酯等。 二异氰酸酯可用于生产 聚氨酯。 通常以少一个碳原子的 胺 为原料，通过与 光气 反应引入异氰酸基。 [1] 实验室中，异氰酸酯可通过酰基叠氮的 Curtius重排反应 或 异羟肟酸 的 Lossen重排反应 制取。 含有异氰酸酯官能基之有機化合物与 醇 反应生成 氨基甲酸酯，具有2個异氰酸酯官能基之异氰酸酯稱為二异氰酸酯 (di …
Polyisocyanates: A deep dive behind the chemistry - Prospector by …
2021年7月15日 · Di-isocyanates are manufactured for reactions with polyols in the production of polyurethanes. Isocyanates are produced by treating amines with phosgene: RNH 2 + COCl 2 → RNCO + 2 HCl. Phosgene is a highly hazardous material, and the production of isocyanates requires special precautions and care.
异氰酸酯（化学物质）_百度百科
单异氰酸酯是有机合成的重要中间体，可制成一系列 氨基甲酸酯类杀虫剂 、杀菌剂、 除草剂，也用于改进塑料、织物、皮革等的防水性。 二 官能团 及以上的异氰酸酯可用于合成一系列性能优良的 聚氨酯泡沫塑料 、 橡胶 、 弹力纤维 、涂料、胶粘剂、 合成革 、 人造木材 等。 应用最广、产量最大的是有： 甲苯二异氰酸酯 （Toluene Diisocyanate，简称 TDI）； 二苯基甲烷二异氰酸酯 （Methylenediphenyl Diisocyanate，简称 MDI）。
Polyisocyanides, Polyisocyanates - SpringerLink
2014年1月1日 · Although the term “polyisocyanate” sometimes refers to low molecular weight compounds containing more than one isocyano group, this article deals with only polymers obtained from isocyanate monomers via transformation of their isocyano group. A variety of alkyl and aryl isocyanates can be prepared and some of them are commercially available.
Synthetic Control of Helical Polyisocyanates by Living Anionic ...
2022年2月22日 · Interest in polyisocyanates with helical properties is driven by various synthesis methods. Furthermore, the living characteristics of the polymerization of isocyanate have been studied with kinetics. The rigid-rod structures of polyisocyanates generate specific morphologies of block copolymers.
Synthesis and structure investigation of hexamethylene diisocyanate ...
2016年10月28日 · In this article, HDI-based polyisocyanate prepolymer was prepared through self-polymerization of the HDI monomer. To investigate the reaction process, a combination of mass spectrometry (MS) and gel permeation chromatography (GPC) was employed to identify and monitor individual oligomers.
Current State and Perspectives of Simulation and Modeling of
2022年4月19日 · The most important application of isocyanates is in polyurethane (PU) production, of which they are one of the precursors, along with polyols. According to data on compounds [8], the annual growth PU materials market was estimated at USD 18 billion in 2020 with an increase of 5–6% in the period 2021–2025.
How Polyisocyanates are Becoming More Sustainable and …
2023年6月14日 · Over the last decade, there has been a plethora of more sustainable, ecofriendly and less toxic polyisocyanate and polyurethane chemistries developed. These include those derived from biobased sources (rather than from petrochemicals) or the use of nonisocyanate (NIPU) technologies, or polyisocyanates containing very low levels of free isocyanate.
Synthesis and characterization of an isocyanate-terminated ...
2021年4月6日 · An isocyanate-terminated hyperbranched polymer (HBI) was successfully synthesized by reacting hyperbranched polyester (Boltorn TM HB-20) with isophorone diisocyanate (IPDI). Gel permeation chromatography (GPC) was used to monitor the molecular weight and its distribution changes during the synthesis.