anhydride

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anhydride

(ănhī`drīd, –drĭd) [Gr.,=without water], chemical compound formed by removing water, H2O, from another compound; the anhydride can also react with water to form the original compound. An acid anhydride reacts with water to form an acid; e.g., sulfur trioxide, SO3, reacts with water to form sulfuric acid, H2SO4. A basic anhydride reacts with water to form a base; e.g., calcium oxide, CaO, reacts with water to form calcium hydroxide, Ca(OH)2. Anhydrides of organic acids have many uses. They react with alcohols to form esters; e.g., acetic anhydride, (CH3CO)2O, reacts with ethanol, C2H5OH, to form ethyl acetate, CH3COOC2H5, a useful solvent. They also react with ammonia and primary or secondary amines to form amides. Other important acid anhydrides include maleic anhydride and phthalic anhydride.

anhydride

[an′hī‚drīd]
(chemistry)
A compound formed from an acid by removal of water.

anhydride

1. a compound that has been formed from another compound by dehydration
2. a compound that forms an acid or base when added to water
3. any organic compound containing the group -CO.O.CO- formed by removal of one water molecule from two carboxyl groups
References in periodicals archive ?
Being less limited by spatial constraints it is expected that smaller anhydrides will provide better mapping of protein surfaces, and therefore only the acetic anhydride data are reported here.
In this paper we study the mechanism and kinetics of epoxy resins cured via anhydrides on model reactions.
Keywords: Decenyl oxazoline, epoxidation, thermoset films, anhydride, diamine
Alkenylsuccinic anhydride (ASA) is one of the alkaline sizing chemicals commonly used in papermaking.
Similarly, water will open the anhydride to a diacid, which can be used in polyesters or neutralized with base to give a disalt.
There are a number of patents and published work related to melt grafting of maleic anhydride on olefinic polymers.
Styrene-maleic anhydride copolymers (SMA Resins) have a long history of use in the graphic arts industry as dispersing resins and additives in waterborne formulations.
Broad line of epoxy hardeners and catalysts offered, including aliphatic polyamines, aliphatic and aromatic polyamine adducts, anhydrides and polyamides.
An updated market report "Maleic Anhydride (MA): 2010 World Market Outlook And Forecast" has been recently issued by Market Publishers, Ltd.
As the content of anhydrides increases, the peak systematically decreases, as shown in Fig.
Since EVA has no reactive "handles" for the hydrazide functionality, Elf Atochem reacted HA-R100 with an anhydride to raise the molecular weight, thus preventing migration and providing a resin-compatible "carrier.
It can be assumed that the terminal anhydrides groups on PET chain ends are thermally stable until 280 [degrees] C, even if this temperature is kept for 25 minutes.