Unsymmetrical dimethylhydrazine (UDMH) (1,1-Dimethylhydrazine) is a hypergolicrocket fuel ingredient, often used in combination with the oxidiser nitrogen tetroxide. UDMH is toxic, a carcinogen and can explode in the presence of oxidisers. During the 1980s there was concern about the levels of UDMH in various foods being a cancer risk, especially for apple juice. Hypergolic rocket fuels spontaneously ignite when their two components come into contact with each other. ... Rocket fuel is the propellant which is burned with an oxidizer to produce thrust in rockets. ... Nitrogen tetroxide (or Dinitrogen tetroxide) (N2O4) is a hypergolic propellant often used in combination with a hydrazine-based rocket fuel. ... In pathology, a carcinogen is any substance or agent that promotes cancer. ... The 1980s decade refers to the years from 1980 to 1989, inclusive. ... Apple juice (sometimes abbreviated AJ) is the fruit juice product originally manufactured from the pressing of apples. ...
UDMH is also used as a nitrogen source in metalorganic vapour phase epitaxythin-film deposition. Metalorganic vapour phase epitaxy (MOVPE) is a chemical vapour deposition method of epitaxial growth of materials, especially semiconductors from the pyrolysis of organic compounds containing the required chemical elements. ... Thin-film deposition is any technique for depositing a thin film of material onto a substrate or onto previously deposited layers. ...
Lewis formula of UDMH (1,1-Dimethylhydrazine)
Image File history File links Download high resolution version (2000x1681, 34 KB) Description: DE: 1,1-Dimethylhydrazin, UDMH, Unsymmetrisches Dimethylhydrazin EN: N-N-Dimethylhydrazine Source/Drawer: Self made, 09:18, 5 August 2005 (UTC) License: GNU FDL Comments: picture has a resolution ≥ 2000 pixel so it can be used for... Image File history File links Download high resolution version (2000x1681, 34 KB) Description: DE: 1,1-Dimethylhydrazin, UDMH, Unsymmetrisches Dimethylhydrazin EN: N-N-Dimethylhydrazine Source/Drawer: Self made, 09:18, 5 August 2005 (UTC) License: GNU FDL Comments: picture has a resolution ≥ 2000 pixel so it can be used for...
UDMH is a clear, hygroscopic liquid which yellows on exposure to air.
UDMH can be produced commercially by nitrosation of dimethylamine, to N-nitro-sodimethylrtmine, followed by reduction of the intermediate to UDMH and subsequent purification.
UDMH can be prepared, also, by a modification of the Raschig process (see discussion of hydrazine), in which the chloramine intermediate is with dimethylamine rather than with ammonia.
It has the chemical formula N(CH UDMH is often used instead of, or in mixtures with, hydrazine because it improves stability, especially at higher temperatures.
UDMH is employed by many Russian, European, and Chinese rockets.
The Titan family of launch vehicles and the second stage of the Delta use a fuel called Aerozine 50, which is a mixture of 50% UDMH and 50% hydrazine.
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